SIMBAD references

2016ApJS..225...32B - Astrophys. J., Suppl. Ser., 225, 32-32 (2016/August-0)

Spectral properties of cool stars: extended abundance analysis of 1,617 planet-search stars.


Abstract (from CDS):

We present a catalog of uniformly determined stellar properties and abundances for 1,617 F, G, and K stars using an automated spectral synthesis modeling procedure. All stars were observed using the HIRES spectrograph at Keck Observatory. Our procedure used a single line list to fit model spectra to observations of all stars to determine effective temperature, surface gravity, metallicity, projected rotational velocity, and the abundances of 15 elements (C, N, O, Na, Mg, Al, Si, Ca, Ti, V, Cr, Mn, Fe, Ni, and Y). Sixty percent of the sample had Hipparcos parallaxes and V-band photometry, which we combined with the spectroscopic results to obtain mass, radius, and luminosity. Additionally, we used the luminosity, effective temperature, metallicity and α-element enhancement to interpolate in the Yonsei-Yale isochrones to derive mass, radius, gravity, and age ranges for those stars. Finally, we determined new relations between effective temperature and macroturbulence for dwarfs and subgiants. Our analysis achieved precisions of 25 K in {T}_eff, 0.01 dex in [M/H], 0.028 dex for logg, and 0.5 km s^-1 in vsini based on multiple observations of the same stars. The abundance results were similarly precise, between ∼0.01 and ∼0.04 dex, though trends with respect to {T}_eff remained for which we derived empirical corrections. The trends, though small, were much larger than our uncertainties and are shared with published abundances. We show that changing our model atmosphere grid accounts for most of the trend in [M/H] between 5000 and 5500 K, indicating a possible problem with the atmosphere models or opacities.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): catalogs - methods: data analysis - stars: abundances - stars: fundamental parameters - stars: solar type - techniques: spectroscopic - techniques: spectroscopic

VizieR on-line data: <Available at CDS (J/ApJS/225/32): table7.dat table8.dat table9.dat table11.dat>

Nomenclature: Tables 8-9, 11: SPOCS NNNN (Nos 2000-3247) added. Tables 8-9, 11: [BFV2016] HTRFFF-NNNA N=93 among (Nos HTR056-003 to HTR433-003).

Errata: erratum vol. 230, art. 12 (2017)

CDS comments: Only known stars have been processed in SIMBAD; new objects have not been processed because of poor astrometry.

Simbad objects: 1473

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