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Title:
The Space Interferometry Mission Astrometric Grid Giant Star Survey. I. Stellar Parameters and Radial Velocity Variability
Authors:
Bizyaev, Dmitry; Smith, Verne V.; Arenas, Jose; Geisler, Doug; Majewski, Steven R.; Patterson, Richard J.; Cunha, Katia; Del Pardo, Cecilia; Suntzeff, Nicholas B.; Gieren, Wolfgang
Affiliation:
AA(National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719; .; Sternberg Astronomical Institute, 13 Universitetsky Prospekt, Moscow, 119899, Russia.), AB(National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719; .; McDonald Observatory, University of Texas, Austin, TX 78712; .), AC(Universidad de Concepcion, Casilla 4009, Concepcion, Chile; , .), AD(Universidad de Concepcion, Casilla 4009, Concepcion, Chile; , .), AE(Department of Astronomy, University of Virginia, Charlottesville, VA 22903-0818 , .), AF(Department of Astronomy, University of Virginia, Charlottesville, VA 22903-0818 , .), AG(National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719; .; Observatorio Nacional, Rio de Janeiro, Brazil; .), AH(Department of Physics, University of Texas at El Paso, El Paso, TX 79968; .), AI(Cerro Tololo Inter-American Observatory, La Serena, Chile; .), AJ(Universidad de Concepcion, Casilla 4009, Concepcion, Chile; , .)
Publication:
The Astronomical Journal, Volume 131, Issue 3, pp. 1784-1796. (AJ Homepage)
Publication Date:
03/2006
Origin:
UCP
AJ Keywords:
Stars: Abundances, Stars: Fundamental Parameters, Stars: Late-Type, Stars: Oscillations, Techniques: Radial Velocities
DOI:
10.1086/500243
Bibliographic Code:
2006AJ....131.1784B

Abstract

We present results from a campaign of multiple-epoch echelle spectroscopy of relatively faint (V=9.5-13.5 mag) red giants observed as potential astrometric grid stars for the Space Interferometry Mission (SIM PlanetQuest). Data are analyzed for 775 stars selected from the Grid Giant Star Survey, spanning a wide range of effective temperatures (Teff), gravities, and metallicities. The spectra are used to determine these stellar parameters and to monitor radial velocity (RV) variability at the 100 m s-1 level. The degree of RV variation measured for 489 stars observed two or more times is explored as a function of the inferred stellar parameters. The percentage of RV-unstable stars is found to be very high-about two-thirds of our sample. It is found that the fraction of RV-stable red giants (at the 100 m s-1 level) is higher among stars with Teff~4500 K, corresponding to the calibration-independent range of infrared colors 0.59<(J-Ks)0<0.73. A higher percentage of RV-stable stars is found if additional constraints of surface gravity and metallicity ranges, 2.3<logg<3.2 and -0.5<[Fe/H]<-0.1, respectively, are applied. Selection of stars based on only photometric values of effective temperature (4300 K<Teff<4700 K) is a simple and effective way to increase the fraction of RV-stable stars. The optimal selection of RV-stable stars, especially in the case in which the Washington photometry is unavailable, can rely effectively on the 2MASS colors constraint 0.59<(J-Ks)0<0.73. These results have important ramifications for the use of giant stars as astrometric references for the SIM PlanetQuest.
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