J/A+A/627/A138 XSL atmospheric parameters (Arentsen+, 2019)
Stellar atmospheric parameters for 754 spectra from the X-shooter Spectral
Library.
Arentsen A., Prugniel P., Gonneau A., Lancon A., Trager S.C., Peletier R.F.,
Lyubenova M., Chen Y.-P., Falcon-Barroso J., Sanchez Blazquez P.,
Vazdekis A.
<Astron. Astrophys. 627, A138 (2019)>
=2019A&A...627A.138A 2019A&A...627A.138A (SIMBAD/NED BibCode)
ADC_Keywords: Atlases ; Spectroscopy ; Effective temperatures ;
Abundances, [Fe/H]
Keywords: atlases - stars: fundamental parameters - methods: data analysis -
techniques: spectroscopic
Abstract:
The X-shooter Spectral Library (XSL) is an empirical stellar library
at medium spectral resolution covering the wavelength range from 3000
to 24800 angstrom. This library aims to provide a benchmark for
stellar population studies. In this work, we present a uniform set of
stellar atmospheric parameters, effective temperatures, surface
gravities, and iron abundances for 754 spectra of 616 XSL stars. We
used the full-spectrum fitting package ULySS with the empirical MILES
library as reference to fit the ultraviolet-blue (UVB) and visible
(VIS) spectra. We tested the internal consistency and we compared our
results with compilations from the literature. The stars cover a range
of effective temperature 2900<Teff<38000K, surface gravity 0<logg<5.7,
and iron abundance -2.5<[Fe/H]<+1.0, with a couple of stars extending
down to [Fe/H]=-3.9. The precisions of the measurements for the G- and
K-type stars are 0.9%, 0.14, and 0.06 in Teff, log g and [Fe/H],
respectively. For the cool giants with logg<1, the precisions are
2.1%, 0.21, and 0.22, and for the other cool stars these values are
1%, 0.14, and 0.10. For the hotter stars (Teff>6500K), these values
are 2.6%, 0.20, and 0.10 for the three parameters.
Description:
The X-shooter spectra used in this work were obtained in ESO runs
084.B-0869(A/B), 085.B-0751(A/B) and 189.B-0925(A/B/C/D). They will be
published in the XSL DR2 paper (currently in preparation).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 106 807 *Derived atmospheric parameters of the XSL stars
tablea2.dat 101 4123 *4123 individual atmospheric parameters from a
literature compilation
tablea3.dat 95 807 Mean atmospheric parameters from the
literature compilation
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Note on tablea1.dat: General note: additional flags for the quality of the XSL
spectra are described in the DR2 paper (Gonneau et al. in prep), and should be
taken into account when using the parameters.
Note on tablea2.dat: Compilation based on PASTEL, supplemented by other series
of measurements missing in PASTEL (but satisfying its selection criteria) and
measurements that extend the boundaries of PASTEL.
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 25 A25 --- HNAME Designation of the star
27- 29 I3 --- x XSL unique observation ID (repeated
observations of the same star have
different ID's)
31- 35 I5 K Teffuvb ? Effective temperature from the UVB
37- 41 F5.2 [cm/s2] logguvb ? Log of the surface gravity from the UVB
43- 47 F5.2 [Sun] [Fe/H]uvb ? Metallicity from the UVB
49- 53 I5 K Teffvis ? Effective temperature from the VIS
55- 59 F5.2 [cm/s2] loggvis ? Log of the surface gravity from the VIS
61- 65 F5.2 [Sun] [Fe/H]vis ? Metallicity from the VIS
67- 71 I5 K Teff ? Adopted effective temperature (1)
73- 76 I4 K e_Teff ? Error on teff
78- 82 F5.2 [cm/s2] logg ? Adopted log of the surface gravity (1)
84- 87 F4.2 [cm/s2] e_logg ? Error on logg
89- 93 F5.2 [Sun] [Fe/H] ? Adopted metallicity (1)
95- 98 F4.2 [Sun] e_[Fe/H] ? Error on [Fe/H]
100 I1 --- f_Teff [1]? Flag teff literature discrepancy (2)
102 I1 --- f_logg [1]? Flag logg literature discrepancy (2)
104 I1 --- f_[Fe/H] [1]? Flag feh literature discrepancy (2)
106 I1 --- Cflag [1]? Carbon star flag (3)
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Note (1): combination of UVB and VIS results as described in the paper
Note (2): is 1 if the difference between the adopted parameter and the
literature is larger than 10%, 1.0 and 0.5 for teff, logg and feh
respectively, and there are at least two literature measurements available.
Note (3): carbon star studied by Gonneau et al. (2017, in prep.), parameters
from that paper are preferred.
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- HNAME Designation of the star
25 A1 --- --- [J]
26- 27 I2 h RAh Right ascension (J2000)
28- 29 I2 min RAm Right ascension (J2000)
30- 33 F4.1 s RAs Right ascension (J2000)
34 A1 --- DE- Declination sign (J2000)
35- 36 I2 deg DEd Declination sign (J2000)
37- 38 I2 arcmin DEm Declination sign (J2000)
39- 40 I2 arcsec DEs Declination sign (J2000)
42- 46 I5 K Teff ? Effective temperature
48- 52 I5 K e_Teff ? Error on Teff
54- 58 F5.2 [cm/s2] logg ? Log of the surface gravity
60- 63 F4.2 [cm/s2] e_logg ? Error on logg
65- 69 F5.2 [Sun] [Fe/H] ? Metallicity
71- 75 F5.2 [Sun] e_[Fe/H] ? Error on [Fe/H]
77 A1 --- r [HLP] Resolution class (1)
79 A1 --- c [COP] Origin of measurement (2)
81 A1 --- m [AIT] Method (3)
83-101 A19 --- Ref Reference bibcode
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Note (1): Resolution class as follows:
H = high resolution spectroscopy
L = low resolution spectroscopy
P = photometry
Note (2): Origin of measurement as follows:
O = original measurement
C = compilation
P = preliminary (values flagged P are not used in the computation of
the mean atmospheric parameters in Table A.3)
Note (3): Method as follows:
A = model atmosphere
I = isochrones
T = empirical calibration
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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1- 25 A25 --- HNAME Designation of the star
27- 31 I5 K Tefflit ? Average compilation effective
temperature
33- 36 I4 K e_Tefflit ? Standard deviation of teff compilation
38- 39 I2 --- n_Tefflit ? Number of compilation teff measurements
41 I1 --- q_Tefflit [0/2]? Quality flag teff compilation (1)
43- 51 F9.6 [cm/s2] logglit ? Average compilation log of the surface
gravity
53- 62 F10.8 [cm/s2] e_logglit ? Standard deviation of logg compilation
64- 65 I2 --- n_logglit ? Number of compilation logg measurements
67 I1 --- q_logglit [0/2]? Quality flag logg compilation (1)
69- 79 F11.8 [Sun] [Fe/H]lit ? Average compilation metallicity
81- 90 F10.8 [Sun] e_[Fe/H]lit ? Standard deviation of [Fe/H] compilation
92- 93 I2 --- n_[Fe/H]lit ? Number of compilation [Fe/H] measurements
95 I1 --- q_[Fe/H]lit [0/3]? Quality flag [Fe/H] compilation (1)
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Note (1): Quality flag as follows:
0 = for the best values. They are based on high resolution spectroscopic
original measurements published after 1985 and they are consistent
within 6% for Teff, 0.7 for logg, and 0.4 for [Fe/H]
1 = if the compilation contains measurements from low resolution spectra
and the older or less consistent high resolution spectra
2 = if the compilation also includes photometric measurements
3 = if it is not an original measurement but from compilations
(from measurements not included otherwise)
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Acknowledgements:
Anke Arentsen, aarentsen(at)aip.de
(End) Patricia Vannier [CDS] 28-May-2019