Line Broadening in Field Metal-poor Red Giant and Red Horizontal Branch Stars
arXiv:0710.0392 · doi:10.1088/0004-6256/135/1/196
Abstract
We report 349 radial velocities for 45 metal-poor field red giant and red horizontal branch stars. We have have identified one new spectroscopic binary, HD 4306, and one possible such system, HD 184711. We also report 57 radial velocities for 11 of the 91 stars reported on previously by Carney et al. (2003). As was found in the previous study, radial velocity "jitter" is present in many of the most luminous stars. Excluding stars showing spectroscopic binary orbital motion, all 7 of the red giants with M(V) <= -2.0 display jitter, as well as 3 of the 14 stars with -2.0 <= M(V) <= -1.4. We have also measured line broadening in all of the new spectra, using synthetic spectra as templates. The most luminous red giants show significant line broadening, as do many of the red horizontal branch stars, and we discuss briefly possible causes.
To appear in the Astronomical Journal
References in corpus (2)
Cited by in corpus (11)
- A Search for Stars of Very Low Metal Abundance. VI. Detailed Abundances of 313 Metal-Poor Stars
- Binarity in Carbon-Enhanced Metal-Poor stars
- Rotation and Macroturbulence in Metal-poor Field Red Giant and Red Horizontal Branch Stars
- A Giant Planet Around a Metal-poor Star of Extragalactic Origin
- The Mass-Activity relationships in M and K dwarfs. I. Stellar parameters of our sample of M and K dwarfs
- Rotational velocities of the giants in symbiotic stars: III. Evidence of fast rotation in S-type symbiotics
- Titans metal-poor reference stars II. Red giants and CEMP stars
- The Gaia-ESO Survey: Spectroscopic-asteroseismic analysis of K2 stars in Gaia-ESO
- Probing infrared excess connection with Li enhancement among red clump giants
- Where are the binaries? -- Searching for blue horizontal-branch stars in binary systems in the inner Galactic Halo
- Density asymmetry and wind velocities in the orbital plane of the symbiotic binary EG Andromedae