J/MNRAS/519/5472 Stellar parameters of MEGASTAR late-type stars (Molla+, 2023)
MEGASTAR - III. Stellar parameters and data products for DR1 late-type stars.
Molla M., Garcia-Vargas M.L., Millan-Irigoyen I., Cardiel N., Carrasco E.,
Gil De Paz A., Berlanas S.R., Gomez-Alvarez P.
<Mon. Not. R. Astron. Soc. 519, 5472-5491 (2023)>
=2023MNRAS.519.5472M 2023MNRAS.519.5472M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, B-type ; Stars, S ; Stars, late-type ; Spectroscopy ;
Optical ; Equivalent widths ; Effective temperatures ;
Radial velocities ; Spectral types ; Abundances ;
Spectra, optical ; Cross identifications ; Photometry ;
Stars, diameters ; Positional data
Keywords: Astronomical data bases: atlases -
Astronomical data bases: catalogues -
stars: abundance - stars: fundamental parameters -
Galaxy: stellar content - galaxies: evolution
Abstract:
MEGARA (Multi Espectrografo en Gran Telescopio Canarias de Alta
Resolucion para Astronomia) is the optical integral-field and
multi-object spectrograph at the Gran Telescopio Canarias. We have
created MEGASTAR , an empirical library of stellar spectra obtained
using MEGARA at high resolution, R=20000 (full width at half-maximum),
available in two wavelength ranges: one centred on Hα, from
6420 to 6790 Å; and the other centred on the Ca II triplet, from
8370 to 8885 Å (HR-R and HR-I volume phase holographic
(VPH)-grating configurations). In this work, we use MEGASTAR spectra,
a combination of these two short wavelength intervals, to estimate the
stellar parameters, namely the effective temperature, surface gravity,
and metallicity (and their associated errors), for a sample of 351
MEGASTAR members with spectral types earlier than B2. We applied a
Χ2-technique by comparing MEGASTAR data with theoretical stellar
models. For those stars with stellar parameters derived in the
literature, we obtained a good agreement between the published
parameters and ours. In addition to the stellar parameters, we also
provide several products, such as the rectified spectra, radial
velocities, and stellar indices, for this sample of stars. In the near
future, we will use MEGASTAR spectra and their derived stellar
parameters to compute stellar population evolutionary synthesis
models, which will contribute to a better interpretation of star
cluster and galactic spectra obtained with MEGARA.
Description:
Based on Paper II spectra and work, our aim is to obtain the
parameters with the same method for all the stars of the library with
these spectral types. To validate the method, we compare our results
with those from the literature whenever they are available. Our
scientific objective is to derive the stellar parameters in a way
similar to in Tabernero et al. (2022A&A...657A..66T 2022A&A...657A..66T, Cat.
J/A+A/657/A66). Our wavelength windows are, however, wider than that
(3 Å) used by these authors, being similar to that from SterPar
for the CaT window. Our method will be applied to the stellar spectra
obtained with R∼20000 in the two wavelength ranges 6420-6790 Å
and 8370-8885 Å. We point out that the methodology for deriving
stellar parameters demands very different tools and techniques
depending on the effective temperature of the stars.Therefore, we have
divided the analysis of the full sample of MEGASTAR DR1 into two
works, this one for the coolest stars, spectral types from B2 to S,
with a limiting upper Teff of 25000 K and and a forthcoming paper
for the hottest stars of the atlas (i.e section Introduction).
First as explained in section 2, to facilitate the estimation of the
atmospheric stellar parameters, we rectified continuum on the 351
stellar spectra obtained with MEGARA spectrograph (optical
integral-field and multi-object fibre-fed spectrograph for the Gran
Telescopio Canarias, the 10.4-m telescope located in La Palma, Canary
Islands, Spain). We use two spectral configurations one centred on
Hα (HR-R) and the other on the Ca II triplet, CaT (HR-I). We
compared our observed spectra with the stellar models in Munari et al.
(2005A&A...442.1127M 2005A&A...442.1127M, Cat. J/A+A/442/1127, MUN05) providing a library
of synthetic spectra to 2500 to 10500 Å. As detailed in section
2, MUN05 models able to determine reliable radial velocity
corrections. Then, a list of selected spectral lines and stellar
indices for measurements of their EWs is chosen.
Next, as exposed in section 3, we applied our Χ2 technique to
fit correted-observed spectra with MUN05 theoretical spectra in order
to obtain estimated the physical parameters of the MEGASTAR stars
subsample. Estimates are presented in table2.dat for the 351 stars as
well as the EWs used in tablea3.dat. The table2.dat also presents
stellar parameters from literature and likelihood/confidence-level
obtained for Χ2min corresponds to the most likely model. More,
observed and fit spectra in HR-R and HR-I are available for each stars
for DR1 (i.e. Paper II, Carrasco et al., 2021MNRAS.501.3568C 2021MNRAS.501.3568C) and
DR1.1 (i.e. this work Paper III). Also, we include Papper II appendix
tables presenting spectrum properties, observation informations,
inferred stellar parameters and optical photometry cross-matches
(Simbad, Hipparcos, Tycho and Gaia).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 134 351 Stellar parameters for MEGASTAR sample from our
fit to MUN05 models using HR-R and HR-I set-ups
tablea3.dat 387 351 Measurements of spectral absorption lines and
indices used to correlate stellar parameters
tableobs.dat 247 785 Rectified stellar DR1.1 spectrum properties
observed in HR-R and HR-I MEGARA configurations
spdr1p1/* . 785 Individual DR1.1 rectified spectra in both HR-R
and HR-I spectral configurations
tabledr1.dat 338 838 Reduced stellar DR1 spectrum properties observed
in HR-R and HR-I MEGARA configurations from
Paper II Carrasco et al., 2021MNRAS.501.3568C 2021MNRAS.501.3568C
spdr1/* . 838 *Individual DR1 reduced spectra in both HR-R
and HR-I spectral configurations from
Paper II Carrasco et al., 2021MNRAS.501.3568C 2021MNRAS.501.3568C
tabdr1ap.dat 702 388 Stellar param infered with Apsis Priam/FLAME,
photometry cross-matches for the DR1 MEGARA-GTC
Stellar Library sample from Paper II Carrasco
et al., 2021MNRAS.501.3568C 2021MNRAS.501.3568C
fitsp1p1/* . 702 Individual DR1.1 spectra fits based on MUN05
models in both HR-R and HR-I spectral configs
--------------------------------------------------------------------------------
Note on spdr1/* : The release contains observed and calibrated spectra from
the MEGARA-GTC Stellar Library stars after a basic quality control check. All
spectra have been reduced with MEGARA Data Reduction Pipeline (DRP), and have
been passed through all standard reduction steps: bias subtraction, fiber
tracing and extraction, flat-field and wavelength calibration and spectral
response/flux correction. The spectra come from filler-type GTC observations
and have been observed at different seeing conditions. However, we have
extracted 37 spaxels around the star's centroid position, meaning that most
of the flux would be guaranteed for seeing better than 2.5 arcsec. We have
extracted the spectra in the same wavelength range: 6420-6790 Å in HR-R
and 8370-8885 Å in HR-I. Flux is in Jansky (Jy). No radial velocity
correction either continuum normalization or lines measurement products have
been included in this release. The team is working in new products associated
to the observations of this release.
--------------------------------------------------------------------------------
See also:
J/MNRAS/506/4781 : HR-PYPOPSTAR model (Millan-irigoyen+, 2021)
J/MNRAS/493/871 : MEGARA-GTC stellar spectral library I (Garcia-Vargas+, 2020)
J/MNRAS/491/2025 : Synthetic stellar spectra in SPS models (Coelho+, 2020)
J/MNRAS/398/451 : PopStar I: Evolutionary synthesis models (Molla+, 2009)
J/MNRAS/396/1895 : MgI and sTiO index definitions (Cenarro+, 2009)
J/A+A/657/A66 : List of FeI and FeII used for SteParSyn (Tabernero+, 2022)
J/A+A/627/A138 : XSL atmospheric parameters (Arentsen+, 2019)
J/A+A/623/A143 : Code Pegase.3 (Fioc+, 2019)
J/A+A/618/A25 : Model stellar spectra for B to early-M
(Allende Prieto+, 2018)
J/A+A/512/A13 : EW-Teff calibration for solar-type stars (Sousa+, 2010)
J/A+A/442/1127 : Library of 2500-10500Å synthetic spectra (Munari+, 2005)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Name The star name of the MEGASTAR member
(Nombre)
12- 16 I5 K Teffr ? Effective temperature as found in the
literature (Teff_ref)
18- 21 F4.2 [cm/s2] loggr ? The surface gravity (log_ref)
23- 27 F5.2 [Sun] [M/H]r ? The [M/H] as found in the literature
(met_ref)
29- 38 A10 --- SpType The spectral type (Sp.Type)
40- 45 F6.1 km/s RV The radial velocity (Rvel)
47- 50 F4.1 km/s e_RV Error of RV (errRvel)
52- 56 F5.1 --- SNRhrr The SNR in the HR-R set-up (SNR-HRR)
58- 62 F5.1 --- SNRhri The SNR in the HR-I set-up (SNR-HRI)
64- 68 I5 K Teffmin The stellar parameters Teff obtained by the
Χ2 technique (Teff_min)
70- 72 F3.1 [cm/s2] loggmin The surface gravity obtained by the
Χ2 technique (g_min)
74- 77 F4.1 [Sun] [M/H]min The [M/H] obtained by the
Χ2-technique (met_min)
79- 87 E9.4 --- Chi2min The associated Χ2min (chi2_min)
89- 93 F5.3 --- L The associated likelihood L (L/Prob)
95- 98 I4 --- Nl The number of wavelength used in each
stellar fit (nlam)
100-102 I3 --- Nm The number of models with similar L around
the value with minimum Χ2min (nmod)
104-108 I5 K Teff The effective temperature Teff obtained as
average of those models (<Teff>)
110-113 I4 K e_Teff Error of Teff (errT)
115-118 F4.2 [cm/s2] logg The surface gravity obtained as average of
those models ()
120-123 F4.2 [cm/s2] e_logg Error of logg (errg)
125-129 F5.2 [Sun] [M/H] The [M/H] obtained as average of those
models (<[M/H>)
131-134 F4.2 [Sun] e_[M/H] Error of [M/H] (errMH)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Name The star name of the MEGASTAR member
(Nombre) (name1)
12- 19 F8.5 0.1nm EWCaI6439 The equivalent width of CaI as defined
in this work at 6439 Å with line
bandpass of 6438.55-6439.75 Å
(CaI-6439)
21- 27 F7.5 0.1nm e_EWCaI6439 Error of EWCaI6439 (er6419)
29- 36 F8.5 0.1nm EWCaI6439w The equivalent width of CaI as defined
in this work at 6439 Å with wide
line bandpass of 6437.50-6441.50 Å
(CaI-6439w)
38- 44 F7.5 0.1nm e_EWCaI6439w Error of EWCaI6439w (er6419w)
46- 53 F8.5 0.1nm EWFeI6463 The equivalent width of FeI as defined
in this work at 6463 Å with line
bandpass of 6462.15-6463.60 Å
(FeI-6463)
55- 61 F7.5 0.1nm e_EWFeI6463 Error of EWFeI6463 (er6463)
63- 70 F8.5 0.1nm EWFeI6463w The equivalent width of FeI as defined
in this work at 6463 Å with wide
line bandpass of 6461.50-6464.00 Å
(FeI-6463w)
72- 78 F7.5 0.1nm e_EWFeI6463w Error of EWFeI6463w (er6463w)
80- 87 F8.5 0.1nm EWCaI6494 The equivalent width of CaI as defined
in this work at 6494 Å with line
bandpass of 6493.30-6494.30 Å
(CaI-6494)
89- 95 F7.5 0.1nm e_EWCaI6494 Error of EWCaI6494 (er6494)
97-104 F8.5 0.1nm EWFeI6495 The equivalent width of FeI as defined
in this work at 6495 Å with line
bandpass of 6494.25-6495.55 Å
(FeI-6495)
106-112 F7.5 0.1nm e_EWFeI6495 Error of EWFeI6495 (er6495)
114-121 F8.5 0.1nm EWCaI+FeI The equivalent width of CaI+FeI as
defined in this work at 6494+6495 Å
with line bandpass of
6493.30-6495.55 Å (ew6494-6495)
123-131 F9.5 0.1nm e_EWCaI+FeI Error of EWCaI+FeI (er94-95)
133-140 F8.5 0.1nm EWFeI6593 The equivalent width of FeI as defined
in this work at 6593 Å with line
bandpass of 6592.20-6593.40 Å
(FeI-6593)
142-148 F7.5 0.1nm e_EWFeI6593 Error of EWFeI6593 (er6593)
150-157 F8.5 0.1nm EWFeI6594 The equivalent width of FeI as defined
in this work at 6594 Å with line
bandpass of 6593.40-6594.40 Å
(FeI-6594)
159-165 F7.5 0.1nm e_EWFeI6594 Error of EWFeI6594 (err6594)
167-174 F8.5 0.1nm EWFeI6593+6594 The equivalent width of FeI as defined
in this work at 6593+6594 Å with
line bandpass of 6592.00-6594.60 Å
(FeI-6593-6594)
176-182 F7.5 0.1nm e_EWFeI6593+6594 Error of EWFeI6593+6594 (er93-94)
184-191 F8.5 0.1nm EWFeI6717 The equivalent width of FeI as defined
in this work at 6717 Å with line
bandpass of 6716.00-6719.00 Å
(FeI-6717)
193-199 F7.5 0.1nm e_EWFeI6717 Error of EWFeI6717 (er6717)
201-208 F8.5 0.1nm EWHa-GON The equivalent width of Hα
index as defined in Gonzalez Delgado et
al. 2005MNRAS.357..945G 2005MNRAS.357..945G at 6562.79 Å
with line bandpass of
6553.0-6573.0 Å (Ha-GON)
210-216 F7.5 0.1nm e_EWHa-GON Error of EWHa-GON (errha)
218-225 F8.5 0.1nm EWCaT1-CEN01 The equivalent width of CaT1 index as
defined in Cenarro et al.
2001MNRAS.326..981C 2001MNRAS.326..981C at 8498.00 Å
with line bandpass of
8484.0-8513.0 Å (CaT1CEN)
227-233 F7.5 0.1nm e_EWCaT1-CEN01 Error of EWCaT1-CEN01 (errCaT1CEN)
235-242 F8.5 0.1nm EWCaT2-CEN01 The equivalent width of CaT2 index as
defined in Cenarro et al.
2001MNRAS.326..981C 2001MNRAS.326..981C at 8542.09 Å
with line bandpass of
8522.0-8562.0 Å (CaT2CEN)
244-250 F7.5 0.1nm e_EWCaT2-CEN01 Error of EWCaT2-CEN01 (errCaT2CEN)
252-259 F8.5 0.1nm EWCaT3-CEN01 The equivalent width of CaT3 index as
in Cenarro et al. 2001MNRAS.326..981C 2001MNRAS.326..981C
at 8662.14 Å with line bandpass of
8642.0-8682.0 Å (CaT3CEN)
261-267 F7.5 0.1nm e_EWCaT3-CEN01 Error of EWCaT3-CEN01 (errCaT3CEN)
269-276 F8.5 0.1nm EWMgI-CEN09 Equivalent width of MgI at 8807.00 Å
with line bandpass of 8802.5-8811.0 Å
(MgICEN) (1)
278-284 F7.5 0.1nm e_EWMgI-CEN09 Error of EWMgI-CEN09 (errMgI)
286-293 F8.5 0.1nm EWPa1-CEN01 The equivalent width of Pa1 index as
in Cenarro et al. 2001MNRAS.326..981C 2001MNRAS.326..981C
at 8467.90 Å with line bandpass of
8461.0-8474.0 Å (Pa1CEN)
295-301 F7.5 0.1nm e_EWPa1-CEN01 Error of EWPa1-CEN01 (errPa1CEN)
303-310 F8.5 0.1nm EWPa2-CEN01 The equivalent width of Pa2 index as
in Cenarro et al. 2001MNRAS.326..981C 2001MNRAS.326..981C
at 8599.04 Å with line bandpass of
8577.0-8619.0 Å (Pa2CEN)
312-318 F7.5 0.1nm e_EWPa2-CEN01 Error of EWPa2-CEN01 (errPa2CEN)
320-327 F8.5 0.1nm EWPa3-CEN01 The equivalent width of Pa3 index as
in Cenarro et al. 2001MNRAS.326..981C 2001MNRAS.326..981C
at 8751.13 Å with line bandpass of
8730.0-8772.0 Å (Pa3CEN)
329-335 F7.5 0.1nm e_EWPa3-CEN01 Error of EWPa3-CEN01 (errPa3CEN)
337-344 F8.5 0.1nm EWCaT1-MEG The equivalent width of CaT1 index as
in this work at 8498.00 Å with line
bandpass of 8482.0-8512.0 Å (CaT1MEG)
346-353 F8.5 0.1nm e_EWCaT1-MEG [] Error of EWCaT1-MEG (errCaT1MEG)
355-362 F8.5 0.1nm EWCaT2-MEG The equivalent width of CaT2 index as
in this work at 8542.09 Å with line
bandpass of 8531.0-8554.0 Å (CaT2MEG)
364-370 F7.5 0.1nm e_EWCaT2-MEG Error of EWCaT2-MEG (errCaT2MEG)
372-379 F8.5 0.1nm EWCaT3-MEG The equivalent width of CaT3 index as
in this work at 8662.14 Å with line
bandpass of 8650.0-8673.0 Å (CaT3MEG)
381-387 F7.5 0.1nm e_EWCaT3-MEG Error of EWCaT3-MEG (errCaT3MEG)
--------------------------------------------------------------------------------
Note (1): Equivalent width as in defined Cenarro et al. 2009MNRAS.396.1895C 2009MNRAS.396.1895C,
Cat. J/MNRAS/396/1895.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tableobs.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 21 A21 --- ObsID Spectroscopic observation identifier
(IDOBSERV)
23- 32 A10 --- Name The star name of the MEGASTAR member (OBJECT)
34- 42 A9 --- OName Alternative object name (OBJONAME)
44- 45 I2 h RAh Right ascension (J2000)
47- 48 I2 min RAm Right ascension (J2000)
50- 53 F4.1 s RAs Right ascension (J2000)
55 A1 --- DE- Declination sign (J2000)
56- 57 I2 deg DEd Declination (J2000)
59- 60 I2 arcmin DEm Declination (J2000)
62- 65 F4.1 arcsec DEs Declination (J2000)
67- 83 A17 --- SpType The spectral type (SP_TYPE)
85- 89 I5 K Teffr ? Effective temperature as found in the
literature (TEFF)
91- 95 I5 K Teff ? The effective temperature Teff average of
models as obtained in MEGASTAR Paper III
(TEFF_L)
97-100 I4 K e_Teff ? Error of Teff (errTEFF_L)
102-104 F3.1 [cm/s2] loggr ? The surface gravity as found in the
literature (LOGG)
106-109 F4.2 [cm/s2] logg ? The surface gravity average of models
as obtained in MEGASTAR Paper III (LOGG_L)
111-114 F4.2 [cm/s2] e_logg ? Error of logg (errLOGG_L)
116-120 F5.2 [Sun] [Fe/H]r ? Iron to hydrogen abundance ratio as found
in the literature (FE_H)
122-126 F5.2 [Sun] [M/H] ? The [M/H] average of models as obtained in
MEGASTAR Paper III (MHL)
128-131 F4.2 [Sun] e_[M/H] ? Error of [M/H] (errMHL)
133-136 A4 --- VPH [HR-I HR-R] Spectral configuration HR-I or
HR-R volume phase holographic gratings VPHs
(VPH)
138-146 A9 --- Ref Literature reference of Teffr, loggr and
[Fe/H]r (REF) (1)
148-165 A18 --- TW This work reference MEGASTAR Paper III of
Teff, logg and [M/H] (TW)
167-172 F6.1 km/s RV ? The radial velocity (RADIAL_V)
174-177 F4.1 km/s e_RV ? Error of RV (errRADIAL_V)
179-181 I3 --- SNRhrr ? The SNR in the HR-R set-up (SNR_HR-R)
183-185 I3 --- SNRhri ? The SNR in the HR-I set-up (SNR_HR-I)
187-194 F8.3 0.1nm bLambda Lower value of the observed wavelength
interval (LowWavelengthinterval)
196-203 F8.3 0.1nm BLambda Upper value of the observed wavelength
interval (HighWavelengthinterval)
205-222 A18 --- Com Comment on spectra as RECTIFIED SPECTRUM
from work described in section 2
(Unit_magnitudes)
224-242 F19.17 0.1nm Delta Delta lambda used for the observed spectrum
(Delta_lambda)
244-247 I4 --- o_ObsID Number of observation points in the spectrum
(Numberofpoints)
--------------------------------------------------------------------------------
Note (1): Literature references are as folows:
ELODIE = ELODIE spectrograph OHP observatory,
218 sources in our sample
HARPS = High Accuracy Radial Velocity Planet Searcher
spectrograph, 2 sources in our sample
INDO-US = Coude feed telescope at Kitt Peak National Observatory,
142 sources in our sample
MILES = MILES stellar library with INT telescope,
270 sources in our sample
NGSL = Hubble's Next Generation Spectral Library spectrum,
45 sources in our sample
Stelib = Stelib spectrum library with Siding Spring 2.3 m
telescope, 53 sources in our sample
WR Sample = Wolf-Rayet optical spectroscopy with CFHT-MOS,
3 sources in our sample
X-SHOOTER = XSHOOTER is a multi-wavelength optical spectrograph,
24 sources in our sample
--------------------------------------------------------------------------------
Byte-by-byte Description of file: spdr1p1/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.3 0.1nm Lambda Observed spectroscopic wavelength (Wavelength)
10- 21 E12.7 --- Flux Continuum rectified and RV corrected and
normalized MEGARA spectroscopic flux (Flux)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tabledr1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Name Star name from Simbad (Name)
12- 13 I2 h RAh Right Ascension from Simbad (J2000)
15- 16 I2 min RAm Right Ascension from Simbad (J2000)
18- 22 F5.2 s RAs Right Ascension from Simbad (J2000)
24 A1 --- DE- Declination sign from Simbad (J2000)
25- 26 I2 deg DEd Declination from Simbad (J2000)
28- 29 I2 arcmin DEm Declination from Simbad (J2000)
31- 34 F4.1 arcsec DEs Declination from Simbad (J2000)
36- 47 A12 --- SpType Spectral Type from Simbad (Sp_Type)
49- 58 A10 mag Umag Jonhson-Cousins U magnitude from Simbad (U)
60- 63 F4.1 mag Bmag Jonhson-Cousins B magnitude from Simbad (B)
65- 68 F4.1 mag Vmag Jonhson-Cousins V magnitude from Simbad (V)
70- 73 F4.1 mag Rmag ? Jonhson-Cousins R magnitude from Simbad (R)
75- 78 F4.1 mag Imag ? Jonhson-Cousins I magnitude from Simbad (I)
80- 83 F4.1 mag Jmag ? Jonhson-Cousins J magnitude from Simbad (J)
85- 93 A9 --- OName Other catalogue name for the star
95- 98 A4 --- VPH VPH grating of the observed spectrum (VPH)
100-104 I5 K Teff ? Effective Temperature from Literature (Teff)
106-109 F4.2 [cm/s2] logg ? Surface gravity from literature (Logg)
111-115 F5.2 [Sun] [Fe/H] ? Iron abundance from literature ([Fe/H])
117-125 A9 --- r_Name Original Catalogue from which the star was
inherited (Reference) (1)
127-153 A27 --- File Name of the ASCII/FITS spectrum file
(SCII/FITS_file)
155-159 A5 --- GTC GTC Observing semester (Obs._Period)
161 I1 --- NbrExp Number of exposures (NoExp)
163-165 I3 s Exp Exposure Time of each of the individual
exposures (Exp)
167-171 F5.1 arcsec Seeing Value of the seeing as reported by GTC in the
observation (Seeing)
173-196 A24 --- n_GTC Comments related to the observations (Obs-GTC)
198-338 A141 --- Com Other comments related to the star
(Other_Comments)
--------------------------------------------------------------------------------
Note (1): Literature references are as folows:
ELODIE = ELODIE spectrograph OHP observatory,
248 sources in our sample
HARPS = High Accuracy Radial Velocity Planet Searcher
spectrograph, 2 sources in our sample
INDO-US = Coude feed telescope at Kitt Peak National Observatory,
146 sources in our sample
MILES = MILES stellar library with INT telescope,
272 sources in our sample
NGSL = Hubble's Next Generation Spectral Library spectrum,
46 sources in our sample
Stelib = Stelib spectrum library with Siding Spring 2.3 m
telescope, 54 sources in our sample
WR Sample = Wolf-Rayet optical spectroscopy with CFHT-MOS,
18 sources in our sample
X-SHOOTER = XSHOOTER is a multi-wavelength optical spectrograph,
24 sources in our sample
--------------------------------------------------------------------------------
Byte-by-byte Description of file: spdr1/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.3 0.1nm Lambda Observed spectroscopic wavelength (Wavelength)
(1)
10- 19 E10.5 Jy Flux Reduced and none corrected MEGARA spectroscopic
flux (Flux)
--------------------------------------------------------------------------------
Note (1): HR-I : Wavelength interval: [8369.953,8884.953]
Delta lambda: 0.12998488372093078
Number of points: 3962
HR-R: Wavelength interval: [6420.044,6790.024]
Delta lambda: 0.09738867441860458
Number of points: 3799
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tabdr1ap.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Name Star name from Simbad (Name)
14- 15 I2 h RAh Right Ascension from Simbad (J2000)
17- 18 I2 min RAm Right Ascension from Simbad (J2000)
20- 24 F5.2 s RAs Right Ascension from Simbad (J2000)
27 A1 --- DE- Declination sign from Simbad (J2000)
28- 29 I2 deg DEd Declination from Simbad (J2000)
31- 32 I2 arcmin DEm Declination from Simbad (J2000)
34- 37 F4.1 arcsec DEs Declination from Simbad (J2000)
39- 58 A20 --- SpType Spectral Type from Simbad (Sp_Typ)
59- 66 F8.3 km/s RV ? Radial velocity from Simbad (RV_VALUE)
69- 72 F4.1 mag Umag ? Jonhson-Cousins U magnitude from Simbad
(U)
75- 78 F4.1 mag Bmag ? Jonhson-Cousins B magnitude from Simbad
(B)
81- 84 F4.1 mag Vmag ? Jonhson-Cousins V magnitude from Simbad
(V)
87- 90 F4.1 mag Rmag ? Jonhson-Cousins R magnitude from Simbad
(R)
93- 96 F4.1 mag Imag ? Jonhson-Cousins I magnitude from Simbad
(I)
99-102 F4.1 mag Jmag ? Jonhson-Cousins J magnitude from Simbad
(J)
105-108 F4.1 mag Hmag ? Jonhson-Cousins H magnitude from Simbad
(H)
111-114 F4.1 mag Kmag ? Jonhson-Cousins K magnitude from Simbad
(K)
117-125 A9 --- OName Other catalogue name for the star
(Other_name)
128-134 F7.1 K Teff ? Effective Temperature from Literature
(Teff)
137-140 F4.2 [cm/s2] logg ? Surface gravity from literature (Logg)
144-148 F5.2 [Sun] [Fe/H] ? Iron abundance from literature ([Fe/H])
151-159 A9 --- r_Name Original Catalogue from which the star was
inherited (Reference) (1)
161-301 A141 --- OtherCom Comments related to the star
(Other_Comments)
304-315 A12 --- SName Default name in SIMBAD database (MAIN_ID)
317-325 A9 --- IDvar ID if the star is identified as a known
variable (id_variable)
334-339 I6 --- HIP ? Star name in Hipparcus catalogue of Esa
1997HIP...C......0E 1997HIP...C......0E, Cat. I/239
(id_hipparcos)
345-355 A11 --- TYC Star name in Tycho catalogue of Hog et al.
2000A&A...355L..27H 2000A&A...355L..27H, Cat. I/259 (id_tycho)
358-376 I19 --- GaiaDR2 Star name in Gaia DR2 catalogue of
Gaia Collaboration 2018A&A...616A...1G 2018A&A...616A...1G,
Cat. I/345 (id_gaiadr2)
379-388 F10.6 deg RAGdeg Barycentric right ascension (ICRS) at
Ep=2015.5 (RA_ICRS)
394-399 F6.4 mas e_RAGdeg Standard error of right ascension
(eRAICRS)
401-410 F10.6 deg DEGdeg Barycentric declination (ICRS) at Ep=2015.5
(DE_ICRS)
416-421 F6.4 mas e_DEGdeg Standard error of declination (eDEICRS)
424-442 I19 --- Source Unique source identifier unique within a
particular Data Release (Source)
445-452 F8.4 mas Plx ? Absolute stellar parallax at Ep=2015.5
(Plx)
455-460 F6.4 mas e_Plx ? Standard error of parallax (e_Plx)
462-470 F9.3 mas/yr pmRA ? Proper motion in RA direction (pmRA)
474-478 F5.3 mas/yr e_pmRA ? Standard error of proper motion in RA
(e_pmRA)
480-488 F9.3 mas/yr pmDE ? Proper motion in DEC direction (pmDE)
492-496 F5.3 mas/yr e_pmDE ? Standard error of proper motion in DEC
(e_pmDE)
501 I1 --- Dup [0/1] Source with duplicate sources (Dup)
504-513 I10 e-/s FG G-band mean flux (FG)
516-527 E12.6 e-/s e_FG Error on G-band mean flux (e_FG)
530-536 F7.4 mag Gmag G-band mean magnitude in vega system (Gmag)
539-544 F6.4 mag e_Gmag Standard error of G-band mean magnitude in
vega system (e_Gmag)
547-555 I9 e-/s FBP ? Mean flux in the integrated BP band (FBP)
558-569 E12.6 e-/s e_FBP ? Error on the integrated BP mean flux
(e_FBP)
572-578 F7.4 mag BPmag ? Integrated BP mean magnitude in vega
system (BPmag)
582-587 F6.4 mag e_BPmag ? Standard error of BP mean magnitude in
vega system (e_BPmag)
590-598 I9 e-/s FRP ? Mean flux in the integrated RP band (FRP)
601-612 E12.6 e-/s e_FRP ? Error on the integrated BP mean flux
(e_FRP)
615-621 F7.4 mag RPmag ? Integrated RP mean magnitude in vega
system (RPmag)
625-630 F6.4 mag e_RPmag ? Standard error of RP mean magnitude in
vega system (e_RPmag)
632-638 F7.4 mag BP-RP BP-RP colour (BP-RP)
640-646 F7.2 km/s RVsbar ? Spectroscopic radial velocity in the
solar barycentric reference frame (RV)
649-652 F4.2 km/s e_RVsbar ? Radial velocity error (e_RV)
655-661 F7.2 K TeffApP Stellar effective temperature from
Apsis-Priam (Teff_2)
664-669 F6.4 mag Ag ? Estimate of extinction in the G band from
Apsis-Priam (AG)
674-679 F6.4 mag E(BP-RP) ? Estimate of redenning from Apsis-Priam
(EBP-RP)
682-691 F10.6 Rsun R* ? Estimate of radius from Apsis-FLAME (Rad)
694-702 F9.3 Lsun L* ? Estimate of luminosity from Apsis-FLAME
(Lum)
--------------------------------------------------------------------------------
Note (1): Literature references are as folows:
ELODIE = ELODIE spectrograph OHP observatory,
114 sources in our sample
HARPS = High Accuracy Radial Velocity Planet Searcher
spectrograph, 1 source in our sample
INDO-US = Coude feed telescope at Kitt Peak National Observatory,
68 sources in our sample
MILES = MILES stellar library with INT telescope,
132 sources in our sample
NGSL = Hubble's Next Generation Spectral Library spectrum,
20 sources in our sample
Stelib = Stelib spectrum library with Siding Spring 2.3 m
telescope, 22 sources in our sample
WR Sample = Wolf-Rayet optical spectroscopy with CFHT-MOS,
6 sources in our sample
X-SHOOTER = XSHOOTER is a multi-wavelength optical spectrograph,
12 sources in our sample
--------------------------------------------------------------------------------
History:
From electronic version of the journal and
https://www.fractal-es.com/megaragtc-stellarlibrary/private/home
References:
Garcia-Vargas et al., Paper I 2020MNRAS.493..871G 2020MNRAS.493..871G, Cat. J/MNRAS/493/871
Carrasco et al., Paper II 2021MNRAS.501.3568C 2021MNRAS.501.3568C
(End) Luc Trabelsi [CDS] 11-Feb-2026