Red giant clump in the Tycho-2 catalog (Gontcharov, 2008)

Details Red giant clump in the Tycho-2 catalog (Gontcharov, 2008) Red giant clump in the Tycho-2 catalog (Gontcharov, 2008)

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008ycat..90340868g&link_type=abstract

VizieR On-line Data Catalog: J/PAZh/34/868. Originally published in: 2008PAZh...34..868G; 2008AstL...34..785G

Physics

Proper Motions, Stellar Distribution, Stars: Distances, Stars: Giant, Stars: Horizontal Branch

Scientific paper

The Tycho-2 proper motions and Tycho-2 and 2MASS photometry are used to select 97348 red giant clump (RGC) stars. The interstellar extinction and photometric distance are calculated for each of the stars. The selected stars are shown to form a selection-unbiased sample of RGC stars within about 350 pc of the Sun with the addition of more distant stars. The distribution of the selected stars in space and their motion are consistent with the assumption that the RGC contains Galactic disk stars with various ages and metallicities, including a significant fraction of stars younger than 1Gyr with masses of more than 2 solar masses. These young stars show differences of their statistical characteristics from those of older RGC stars, including differences in the variations of their distribution density with distance from the Galactic plane and in the dispersion of their velocities found using radial velocities and proper motions. The Sun has been found to rise above the Galactic plane by 13+/-1pc. The distribution density of the stars under consideration in space is probably determined by the Local Spiral Arm and the distribution of absorbing matter in the plane of the Gould Belt. Data are also available at: http://www.geocities.com/orionspiral/
(1 data file).

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