Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-10-09
2010, AJ, 140, 500
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
10 pages, 15 figures
Scientific paper
On the basis of a recently derived color-metallicity relation and stellar parameters from the Sloan Digtal Sky Survey Data Release 7 spectroscopic survey, a large sample of red horizontal branch candidates have been selected to serve as standard candles. The metallicity and kinematic distributions of these stars indicate that they mainly originate from the thick-disk and the halo populations. The typical thick disk is characterized by the first group peaking at [Fe/H] ~ -0.6, Vrot ~ 170 km/s with a vertical scale height around |Z| ~ 1.2 kpc, while stars with [Fe/H] < -0.9 are dominated by the halo population. Two sub-populations of the halo are suggested by the RHB stars peaking at [Fe/H] ~-1.3: one component with Vrot > 0 km/s (Halo I) shows a sign of metallicity gradient in the [Fe/H] versus |Z| diagram, while the other with Vrot < 0 km/s (Halo II) does not. The Halo I mainly clumps at the inner halo with R < 10 kpc and the Halo II comes both from the inner halo with R < 10 kpc and the outer halo with R > 10 kpc based on the star distribution in the R versus |Z| diagram.
Chen Yu-Qi
Schuster William J.
Xue Xiang-Xiang
Zhao Gang
Zhao Ji-Kuen
No associations
LandOfFree
Metallicity and Kinematic distributions of Red Horizontal-Branch Stars from the SDSS Survey does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Metallicity and Kinematic distributions of Red Horizontal-Branch Stars from the SDSS Survey, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Metallicity and Kinematic distributions of Red Horizontal-Branch Stars from the SDSS Survey will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-87792