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High quality Spitzer/MIPS obs. of F4-K2 stars
We present a Spitzer MIPS study of the decay of debris disk excesses at 24 and 70{mu}m for 255 stars of types F4-K2. We have used multiple tests, including consistency between... -
HIRES radial velocity measurements
In this paper we search for distant massive companions to known transiting gas giant planets that may have influenced the dynamical evolution of these systems. We present new... -
The SEGUE K giant survey. II. Distances of 6036 stars
We present an online catalog of distance determinations for 6036 K giants, most of which are members of the Milky Way's stellar halo. Their medium-resolution spectra from the... -
Properties of Kepler multi-planet candidate systems
The planet occurrence rate for multiple stars is important in two aspects. First, almost half of stellar systems in the solar neighborhood are multiple systems. Second, the... -
Metallicities of RGB stars in dwarf galaxies
We present spectroscopic metallicities of individual stars in seven gas-rich dwarf irregular galaxies (dIrrs), and we show that dIrrs obey the same mass-metallicity relation as... -
Spectroscopy of faint KOI stars
Stellar properties are measured for a large set of Kepler mission exoplanet candidate host stars. Most of these stars are fainter than 14th magnitude, in contrast to other... -
Candidate planets in the habitable zones
A key goal of the Kepler mission is the discovery of Earth-size transiting planets in "habitable zones" where stellar irradiance maintains a temperate climate on an Earth-like... -
Spectroscopic [Fe/H] of Kepler stars
It has been shown that F, G, and early K dwarf hosts of Neptune-sized planets are not preferentially metal-rich. However, it is less clear whether the same holds for late K and... -
Spectroscopic members of Segue 2 galaxy
Segue 2, discovered by Belokurov et al. (2009, Cat. J/MNRAS/397/1748), is a galaxy with a luminosity of only 900L_{sun}. We present Keck/DEIMOS spectroscopy of 25 members of... -
Kinematics of halo red giants
We explore the kinematics and orbital properties of a sample of red giants in the halo system of the Milky Way that are thought to have formed in globular clusters based on... -
RVs and [Fe/H] of star members of NGC 6388
By combining high spatial resolution and wide-field spectroscopy performed, respectively, with SINFONI and FLAMES at the ESO/VLT we measured the radial velocities of more than... -
Kinematic analysis of red giant in M31 dSphs
We present a homogeneous kinematic analysis of red giant branch stars within 18 of the 28 Andromeda dwarf spheroidal (dSph) galaxies, obtained using the Keck I/LRIS and Keck... -
Improved stellar parameters of smallest KIC stars
We use the optical and near-infrared photometry from the Kepler Input Catalog to provide improved estimates of the stellar characteristics of the smallest stars in the Kepler... -
RR Lyrae stars BV photometry in UMa I
We have performed the first study of the variable star population of Ursa Major I (UMa I), an ultra-faint dwarf satellite recently discovered around the Milky Way (MW) by the... -
CH(G) index of SDSS evolved stars
We have measured the CH G band (CH(G)) index for evolved stars in the globular cluster M3 based on the Sloan Digital Sky Survey (SDSS) spectroscopic survey. It is found that... -
Most metal-poor stars. III. 86 [Fe/H]<=-3.0 stars
We examine the metallicity distribution function (MDF) and fraction of carbon-enhanced metal-poor (CEMP) stars in a sample that includes 86 stars with [Fe/H]<=-3.0, based on... -
The most metal-poor stars in HES and SDSS. I.
We report the discovery of 34 stars in the Hamburg/ESO Survey (HES) for metal-poor stars and the Sloan Digital Sky Survey (SDSS) that have [Fe/H]<~-3.0. Their median and... -
Spectroscopy of 56 exoplanet host stars
We report homogeneous spectroscopic determinations of the effective temperature, metallicity, and projected rotational velocity for the host stars of 56 transiting planets. Our... -
Spectroscopic observations in VV124 (UGC 4879)
VV124 (UGC 4879) is an isolated, dwarf irregular/dwarf spheroidal (dIrr/dSph) transition-type galaxy at a distance of 1.36 Mpc. Previous low-resolution spectroscopy yielded... -
Ages and metallicities of old stellar systems
We present a statistical analysis of the properties of a large sample of dynamically hot old stellar systems, from globular clusters (GCs) to giant ellipticals, which was...
