Stellar kinematic groups. I - The Ursa Major group
1993; Institute of Physics; Volume: 105; Linguagem: Inglês
10.1086/116422
ISSN1538-3881
Autores Tópico(s)Astronomy and Astrophysical Research
Resumoview Abstract Citations (146) References (159) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Stellar Kinematic Groups. I. The URSA Major Group Soderblom, David R. ; Mayor, Michel Abstract The Ursa Major Group (UMaG) is studied as a test case for the authenticity of Stellar Kinematic Groups, using Coravel radial velocities, recent compilations of astrometric data, and new spectroscopic observations. Spectroscopic age indicators, particularly indices of the strength of chromospheric emission, are applied to solar-type candidate members of UMaG, and it is shown that stars that meet the spectroscopic criteria also have kinematics that agree better with the space motions of the nucleus of UMaG than does the starting sample as a whole. The primary limitation on the precision of kinematics is now parallaxes instead of radial velocities. These more restrictive kinematic criteria are then applied to other UMaG candidates and a list summarizing membership is presented. UMaG is also examined as a cluster, confirming its traditional age of 0.3 Gyr, and a mean Fe/H of -0.08 +/- 0.09 for those stars most likely to be bona fide members. Publication: The Astronomical Journal Pub Date: January 1993 DOI: 10.1086/116422 Bibcode: 1993AJ....105..226S Keywords: Kinematics; Solar Neighborhood; Star Clusters; Star Formation; Stellar Spectrophotometry; Milky Way Galaxy; Molecular Clouds; Radial Velocity; Astronomy; STARS: KINEMATICS full text sources ADS | data products SIMBAD (88) MAST (1) INES (1) CDS (1) Related Materials (1) Part 2: 2003AJ....125.1980K
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