J/ApJ/878/134 HARPS and X-shooter spectra of Southern M dwarfs (Kuznetsov+ 2019)
Characterization of a sample of Southern M dwarfs using HARPS and X-shooter
spectra.
Kuznetsov M.K., del Burgo C., Pavlenko Y.V., Frith J.
<Astrophys. J., 878, 134 (2019)>
=2019ApJ...878..134K 2019ApJ...878..134K
ADC_Keywords: Spectra, optical; Stars, M-type; Spectral types;
Abundances, [Fe/H]; Rotational velocities
Keywords: stars: abundances ; stars: fundamental parameters ; stars: low-mass ;
techniques: spectroscopic
Abstract:
We present the homogeneous analysis of a sample of Southern early-type
M dwarfs in the solar neighborhood (d<60pc). We used the MCAL
technique to derive the effective temperature Teff, metallicity
[Fe/H], and activity index ia(Halpha) of 420 M stars using HARPS
spectra. The effective temperature Teff, surface gravity logg,
metallicity [Fe/H], and projected rotational velocity Vrotsini of
153 M0-M6 dwarfs were determined by fitting the observed
intermediate-resolution spectra from the VIS arm of VLT/X-shooter with
a grid of BT-Settl stellar atmosphere models. We estimated the typical
uncertainties of the fit with X-shooter spectra by varying
region-to-region results by σTeff∼50K, σlogg∼0.2, and
σ[Fe/H]∼0.2dex. Photometric verification of Teff for the
295 stars from the HARPS sample and the 61 stars from the X-shooter
sample is also provided. We compared our results from different
methods to estimate absolute uncertainty in determining the physical
properties of M dwarfs.
Description:
The High-accuracy Radial-velocity Planet Searcher (HARPS) is a
high-resolution spectrograph installed on the 3.6m telescope in
La Silla. It has a resolving power of R∼115000 over a spectral range
of 3830-6930Å. Using the ESO Science Archive Facility, we
downloaded 5567 spectra, obtained during a period between 2003 October
and 2017 February, which corresponded to 420 M dwarfs from our sample.
The X-shooter (Intermediate Resolution, High-Efficiency Spectrograph)
spectrograph is mounted on the VLT at the European Southern
Observatory (ESO) in Paranal, Chile. In this paper, we focused on data
obtained from the VIS spectroscopic arm of the X-shooter (5340-10200Å).
The available VIS spectra associated with the stars from our sample
were retrieved from the European Southern Observatory (ESO) science
archive. The spectra were observed between 2009 June and 2017 November.
In total, we collected spectroscopic data for 153 stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 92 420 Physical properties of M dwarfs obtained by MCAL
(technique from Neves+ 2014A&A...568A.121N 2014A&A...568A.121N)
using HARPS spectra
table3.dat 109 347 Physical properties of M dwarfs from X-shooter spectra
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See also:
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
J/AJ/131/1184 : A recalibration of opt. photometry (Maiz-Apellaniz+, 2006)
J/A+A/492/277 : Analysis of Collinder 69 stars with VOSA (Bayo+, 2008)
J/MNRAS/389/585 : Fundamental parameters of M dwarfs (Casagrande+, 2008)
J/AJ/142/138 : All-sky catalog of bright M dwarfs (Lepine+, 2011)
J/PASP/124/140 : UBVRI Hp BT and VT photonic responses (Bessell+, 2012)
J/ApJ/757/112 : Stellar diameters. II. K and M-stars (Boyajian+, 2012)
J/AJ/143/67 : SLoWPoKES. II. Wide & low-mass binaries data (Dhital+, 2012)
J/A+A/542/A33 : 3 M dwarfs near-infrared spectra (Onehag+, 2012)
J/A+A/545/A85 : LHS1070 photometry and spectroscopy (Rajpurohit+, 2012)
J/ApJ/748/93 : K-band spectra for 133 nearby M dwarfs (Rojas-Ayala+, 2012)
J/MNRAS/435/2161 : Catalogue of bright (K<9) M dwarfs (Frith+, 2013)
J/AJ/145/102 : Sp. of bright M dwarfs in the northern sky (Lepine+, 2013)
J/ApJ/779/188 : Spectra of nearby late K and M Kepler stars (Mann+, 2013)
J/ApJS/208/9 : Intrinsic colors & temperatures of PMS stars (Pecaut+, 2013)
J/A+A/556/A15 : Effective temperature scale of M dwarfs (Rajpurohit+, 2013)
J/A+A/565/A117 : X-Shooter Spectral Library (XSL). DR1 (Chen+, 2014)
J/ApJ/791/54 : Nearby M Dwarfs parameters (Gaidos+, 2014)
J/MNRAS/443/2561 : CONCH-SHELL catalog of nearby M dwarfs (Gaidos+, 2014)
J/ApJ/791/10 : Radii of planets around cool stars (Morton+, 2014)
J/A+A/564/A90 : M subdwarfs VLT/UVES high res. spectra (Rajpurohit+, 2014)
J/A+A/577/A128 : CARMENES input cat. of M dwarfs. I (Alonso-Floriano+, 2015)
J/A+A/577/A132 : Stellar parameters of early M dwarfs (Maldonado+, 2015)
J/AJ/149/5 : Solar neighborhood. XXXV. M dwarf distances (Winters+, 2015)
J/A+A/585/A64 : New atmospheric param. of MILES cool stars (Sharma+, 2016)
J/ApJ/850/34 : 3000-25000Å spectroscopy of nearby M dwarfs (Bar+, 2017)
J/ApJ/843/31 : MUSCLES Treasury Survey. IV. M dwarfs (Youngblood+, 2017)
J/A+A/613/A25 : Radial velocity for Ross 128 (Bonfils+, 2018)
J/A+A/615/A6 : Photospheric parameters of CARMENES stars (Passegger+, 2018)
J/A+A/609/L5 : HD147379 b velocity curve (Reiners+, 2018)
J/other/Nat/563.365 : Barnard's star radial velocity curve (Ribas+, 2018)
J/AJ/155/257 : Photometry & RV follow-up obs. of K2-18 (Sarkis+, 2018)
J/AJ/155/24 : RV and planet detectability in alpha Cen (Zhao+, 2018)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Name Name
16- 17 I2 h RAh Hour of Right Ascension (J2000)
19- 20 I2 min RAm Minute of Right Ascension (J2000)
22- 23 I2 s RAs Second of Right Ascension (J2000)
25- 25 A1 --- DE- Sign of the Declination (J2000)
26- 27 I2 deg DEd Degree of Declination (J2000)
29- 30 I2 arcmin DEm Arcminute of Declination (J2000)
32- 33 I2 arcsec DEs Arcsecond of Declination (J2000)
35- 43 A9 --- SpT Spectral Type
45- 48 I4 K Teff1 [2972/4092]? Photometric effective
temperature (1)
50- 52 I3 K e_Teff1 [14/240]? Uncertainty in Teff1 (1)
54- 57 F4.1 [-] [Fe/H]1 [-1/0.5]? Photometric metallicity (1)
59- 61 F3.1 [-] e_[Fe/H]1 [0.1/0.7]? Uncertainty in [Fe/H]1 (1)
63- 64 I2 --- Nobs [1/53] Number of HARPS observations
66- 68 I3 --- SNR [10/557] Signal-to-noise, HARPS observations
70- 73 I4 K Teff2 [2582/4100]? MCAL effective temperature
(uncertainty is ±110K) (1)
75- 77 A3 --- f_Teff2 Flags on Teff2 (2)
79- 83 F5.2 [-] [Fe/H]2 [-0.7/0.91]? MCAL metallicity
(uncertainty is ±0.09dex) (1)
85- 87 A3 --- f_[Fe/H]2 Flags on [Fe/H]2 (2)
89- 92 F4.2 --- iaHa [0/0.86] Chromospheric activity index (3)
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Note (1): Null values indicate that the photometric or spectroscopic MCAL
method could not be applied due to lack of observation data or the
nature of an object.
Note (2): Flags on MCAL (Neves+ 2014A&A...568A.121N 2014A&A...568A.121N) derived values as follows:
a = Noisy spectra: S/N<25;
b = Active stars: Hα>0.25;
c = Fit out of range of MCAL limits: Teff=2800-4100K and
[Fe/H]=-0.85 to +0.26 (dex);
d = Inconsistency with photometry. We suspect the star is going beyond
the Teff limits of MCAL.
Note (3): Chromospheric activity index, ia(Hα) -- as defined by
Gomes+ (2011A&A...534A..30G 2011A&A...534A..30G).
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
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1- 1 I1 --- Set [1/4] Subset (1)
3- 3 A1 --- Avg [SA] S=Single spectrum; or
A=Average value in subset
5- 15 A11 --- Name Name
17- 19 A3 --- Flags Flags (2)
23- 29 A7 --- SpT Spectral type
31- 34 I4 K Teff1 [2896/3924]? Effective temperature
from photometry (3)
36- 38 I3 K e_Teff1 [32/202]? Uncertainty in Teff1 (3)
40- 43 F4.1 [-] [Fe/H]1 [-0.7/0.5]? Metallicity from photometry (3)
45- 47 F3.1 [-] e_[Fe/H]1 [0.1/0.6]? Uncertainty in [Fe/H]1 (3)
49- 51 I3 --- SNR [16/682]? Single X-Shooter spectrum
signal-to-noise
53- 57 I5 --- R [5000/18400]? Single X-Shooter spectrum
grating/resolution
59- 62 I4 K Teff2 [2653/3899] Effective temperature,
full spectrum (4)
64- 67 F4.2 [cm/s2] logg2 [4.2/5.5] Surface gravity, full spectrum (4)
69- 73 F5.2 [-] [Fe/H]2 [-0.9/0.5] Metallicity, full spectrum (4)
75- 78 I4 K Teff3 [2696/3899] Effective temperature,
spectral subregions
80- 82 I3 K e_Teff3 [21/139] Uncertainty in Teff3
84- 87 F4.2 [cm/s2] logg3 [4.5/5.4]? Surface gravity,
spectral subregions (3)
89- 92 F4.2 [cm/s2] e_logg3 [0.08/0.7]? Uncertainty in logg3 (3)
94- 98 F5.2 [-] [Fe/H]3 [-0.7/0.5] Metallicity, spectral subregions
100-103 F4.2 [-] e_[Fe/H]3 [0.08/0.7] Uncertainty in [Fe/H]3
106-106 A1 --- l_Vsini limit flag on Vsini
108-109 A2 km/s Vsini Projected rotational velocity
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Note (1): Subset of X-shooter observations, grouped by spectral resolution
as follows:
1 = R18000 subset;
2 = R11000 subset;
3 = R8800 subset;
4 = R5400 subset.
Note (2): Flag on observations as follows:
a = Emission cores of the lines of NaI doublet ∼5890Å or/and of the
KI doublet ∼7680Å;
b = Emission cores of the lines of KI doublet ∼7680Å;
c = 2MASSJ01273195-3140031.
Note (3): Null values indicate that it was impossible to obtain the value of
the parameter due to the lack or low quality of the observation data.
Note (4): Uncertainties for the full spectrum fit include Teff=±50K;
logg=±0.25; [Fe/H]=±0.25.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 04-Dec-2020