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J/A+A/598/A100      Abundances of disk giants: O, Mg, Ca and Ti (Jonsson+, 2017)

Abundances of disk and bulge giants from high-resolution optical spectra: I. O, Mg, Ca, and Ti in the solar neighborhood and Kepler field samples. Jonsson H., Ryde N., Nordlander T., Pehlivan Rhodin A., Hartman H., Jonsson P., Eriksson K. <Astron. Astrophys. 598, A100 (2017)> =2017A&A...598A.100J (SIMBAD/NED BibCode)
ADC_Keywords: Stars, giant ; Abundances ; Spectroscopy Keywords: solar neighborhood - Galaxy: evolution - stars: abundances Abstract: The Galactic bulge is an intriguing and significant part of our Galaxy, but it is hard to observe because it is both distant and covered by dust in the disk. Therefore, there are not many high-resolution optical spectra of bulge stars with large wavelength coverage, whose determined abundances can be compared with nearby, similarly analyzed stellar samples. We aim to determine the diagnostically important alpha elements of a sample of bulge giants using high-resolution optical spectra with large wavelength coverage. The abundances found are compared to similarly derived abundances from similar spectra of similar stars in the local thin and thick disks. In this first paper we focus on the solar neighborhood reference sample. We used spectral synthesis to derive the stellar parameters as well as the elemental abundances of both the local and bulge samples of giants. We took special care to benchmark our method of determining stellar parameters against independent measurements of effective temperatures from angular diameter measurements and surface gravities from asteroseismology. In this first paper we present the method used to determine the stellar parameters and elemental abundances, evaluate them, and present the results for our local disk sample of 291 giants. When comparing our determined spectroscopic temperatures to those derived from angular diameter measurements, we reproduce these with a systematic difference of +10K and a standard deviation of 53K. The spectroscopic gravities reproduce those determined from asteroseismology with a systematic offset of +0.10dex and a standard deviation of 0.12dex. When it comes to the abundance trends, our sample of local disk giants closely follows trends found in other works analyzing solar neighborhood dwarfs, showing that the much brighter giant stars are as good abundance probes as the often used dwarfs. Description: Spectroscopic stellar parameters and oxygen, magnesium, calcium, and titanium abundances for 291 local disk giants are presented. Spectra from observations with the spectrometer FIES at NOT, and from archives (FIES and PolarBase) are used. The FIES spectra have R=67000 and the ones from PolarBase have R=67000. In general most stars are very bright and have S/N around 100. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 102 291 Basic data for the observed giants tablea3.dat 76 291 Stellar parameters and abundances for observed giants
See also: J/A+A/543/A160 : Normalized spectra of 82 Kepler red giants (Thygesen+, 2012) Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 14 A14 --- Name Name (HIP, KIC or TYC) 16- 38 A23 --- AName Alternative name 40- 41 I2 h RAh Right ascension (J2000) 43- 44 I2 min RAm Right ascension (J2000) 46- 53 F8.5 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- 68 F7.4 arcsec DEs Declination (J2000) 70- 74 F5.2 --- Vmag V magnitude 76- 82 F7.2 km/s RV Radial velocity 84- 86 I3 --- S/N Signal-to-noise ratio (1) 88-102 A15 --- Source Source of spectrum (2)
Note (1): As measured by http://www.stecf.org/software/ASTROsoft/DER_SNR Note (2): Thygesen+2012 for Thygesen et al., 2012, Cat. J/A+A/543/160.
Byte-by-byte Description of file: tablea3.dat
Bytes Format Units Label Explanations
1- 14 A14 --- Name Name (HIP, KIC or TYC) 17- 20 I4 K Teffr ? Reference effective temperature (1) 22- 23 I2 K e_Teffr ? Uncertaity in reference Teff (1) 25- 28 I4 K Teff Effective temperature 30- 34 F5.3 [cm/s2] loggr ? Reference surface gravity (2) 36- 40 F5.3 [cm/s2] e_loggr ? Uncertainty in reference logg (2) 42- 45 F4.2 [cm/s2] logg Surface gravity 47- 51 F5.2 [-] [Fe/H] Relative iron abundance 53- 56 F4.2 km/s vmic Mictoturbulence velocity 58- 61 F4.2 --- A(O) ? Oxygen abundance 63- 66 F4.2 --- A(Mg) Magnesium abundance 68- 71 F4.2 --- A(Ca) Calcium abundance 73- 76 F4.2 --- A(Ti) Titanium abundance
Note (1): Mozurkewich et al. (2003AJ....126.2502M) Note (2): Huber et al. (2014ApJS..211....2H)
Acknowledgements: Henrik Jonsson, henrikj(at)astro.lu.se
(End) Henrik Jonsson [IAC, Spain], Patricia Vannier [CDS] 30-Nov-2016
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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