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J/A+A/615/A6      Photospheric parameters of CARMENES stars   (Passegger+, 2018)

The CARMENES search for exoplanets around M dwarfs. Photospheric parameters of target stars from high-resolution spectroscopy. Passegger V.M., Reiners A., Jeffers S.V., Wende-von Berg S., Schaefer P., Caballero J.A., Schweitzer A., Amado P.J., Bejar V.J.S., Cortes-Contreras M., Hatzes A.P., Kuerster M., Montes D., Pedraz S., Quirrenbach A., Ribas I., Seifert W. <Astron. Astrophys. 615, A6 (2018)> =2018A&A...615A...6P (SIMBAD/NED BibCode)
ADC_Keywords: Stars, M-type ; Abundances, [Fe/H] ; Effective temperatures ; Spectroscopy ; Stars, masses Keywords: astronomical databases: miscellaneous - methods: data analysis - techniques: spectroscopic - stars: fundamental parameters - stars: late-type - stars: low-mass Abstract: The new CARMENES instrument comprises two high-resolution and high-stability spectrographs that are used to search for habitable planets around M dwarfs in the visible and near-infrared regime via the Doppler technique. Characterising our target sample is important for constraining the physical properties of any planetary systems that are detected. The aim of this paper is to determine the fundamental stellar parameters of the CARMENES M-dwarf target sample from high-resolution spectra observed with CARMENES. We also include several M-dwarf spectra observed with other high-resolution spectrographs, that is CAFE, FEROS, and HRS, for completeness. We used a χ2 method to derive the stellar parameters effective temperature T_eff, surface gravity log g, and metallicity [Fe/H] of the target stars by fitting the most recent version of the PHOENIX-ACES models to high-resolution spectroscopic data. These stellar atmosphere models incorporate a new equation of state to describe spectral features of low-temperature stellar atmospheres. Since Teff, logg, and [Fe/H] show degeneracies, the surface gravity is determined independently using stellar evolutionary models. We derive the stellar parameters for a total of 300 stars. The fits achieve very good agreement between the PHOENIX models and observed spectra. We estimate that our method provides parameters with uncertainties of σTeff=51K, σlogg=0.07, and σ[Fe/H]=0.16, and show that atmosphere models for low-mass stars have significantly improved in the last years. Our work also provides an independent test of the new PHOENIX-ACES models, and a comparison for other methods using low-resolution spectra. In particular, our effective temperatures agree well with literature values, while metallicities determined with our method exhibit a larger spread when compared to literature results. Description: We present basic astronomical parameters of 300 M dwarfs within the CARMENES survey. For each star, we provide Carmencita identifier (Karmn), Simbad name, equatorial coordinates, spectral type, effective temperature, surface gravity, metallicity, rotational velocity, stellar mass, CaII emission flag and instrument with which the spectrum was obtained. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 137 300 Basic astrophysical parameters of investigated M dwarfs refs.dat 175 12 References
See also: J/A+A/577/A128 : CARMENES input catalog of M dwarfs I (Alonso-Floriano+, 2015) J/A+A/597/A47 : CARMENES input catalog of M dwarfs II (Cortes-Contreras+ 2017) J/A+A/609/A117 : CARMENES radial velocity curves of 7 M-dwarf (Trifonov+, 2018) J/A+A/609/L5 : CARMENES radial velocity curves of HD147379 b (Reiners+, 2018) J/A+A/612/A49 : 324 CARMENES M dwarfs velocities (Reiners+, 2018) J/A+A/614/A122 : Radial-velocity of CARMENES M dwarfs (Tal-Or+, 2018) Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Karmn Carmencita identifier 14- 34 A21 --- Name Star name 36- 41 A6 --- GJ GJ number 44- 45 I2 h RAh Right Ascension (J2016 ) 47- 48 I2 min RAm Right Ascension (J2016 ) 50- 54 F5.2 s RAs Right Ascension (J2016 ) 57 A1 --- DE- Declination sign (J2016 ) 58- 59 I2 deg DEd Declination (J2016) 61- 62 I2 arcmin DEm Declination (J2016) 64- 67 F4.1 arcsec DEs Declination (J2016) 70- 74 A5 --- SpType MK spectral type 77- 80 I4 K Teff Effective temperature (1) 83- 86 F4.2 [cm/s2] logg Surface gravity (1) 89- 93 F5.2 [-] [Fe/H] Metallicity (1) 96 A1 --- f_vsini Upper limit flag for rotational velocity 97- 99 F3.1 km/s vsini Rotational velocity 102-106 F5.3 Msun Mass ?=- Stellar mass 109 I1 --- f_CaII [0/1] Flag for Ca II IRT emission; 1 if emission visible 112-116 A5 --- Inst Instrument used for observations (2) 119-137 A19 --- Ref Bibcode of reference to vsini, in refs.dat file
Note (1): Errors in Teff, logg and [Fe/H] are the same for all stars: e_Teff = 51 K, e_logg = 0.07, e_[Fe/H] = 0.16 Note (2): Instrument used for observations as follows: CARM = CARMENES single spectrum CARM+ = CARMENES co-added spectrum
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 19 A19 --- BibCode BibCode 21- 40 A20 --- Aut Author's name 43- 58 A16 --- Com Comments 60-175 A116 --- Title Title of the paper
Acknowledgements: Vera Maria Passegger, vpassegger(at) References: Alonso-Floriano et al., Paper I 2015A&A...577A.128A, Cat. J/A+A/577/A128 Cortes-Contreras et al., Paper II 2017A&A...597A..47C, Cat. J/A+A/597/A47 Garcia-Piquer et al., 2017A&A...604A..87G Trifonov et al., 2018A&A...609A.117T, Cat. J/A+A/609/A117 Reiners et al., 2018A&A...609L...5R, Cat. J/A+A/609/L5 Reiners et al., 2018A&A...612A..49R, Cat. J/A+A/612/A49 Sarkis et al., 2018AJ....155..257S
(End) Vera Maria Passegger [HS, Germany], Patricia Vannier [CDS] 29-Jun-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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