Садржај
Слике
Уплоадјуј своје слике
DSS Images Other Images
Везани чланци
Stellar kinematic groups. I - The Ursa Major group The Ursa Major Group (UMaG) is studied as a test case for theauthenticity of Stellar Kinematic Groups, using Coravel radialvelocities, recent compilations of astrometric data, and newspectroscopic observations. Spectroscopic age indicators, particularlyindices of the strength of chromospheric emission, are applied tosolar-type candidate members of UMaG, and it is shown that stars thatmeet the spectroscopic criteria also have kinematics that agree betterwith the space motions of the nucleus of UMaG than does the startingsample as a whole. The primary limitation on the precision of kinematicsis now parallaxes instead of radial velocities. These more restrictivekinematic criteria are then applied to other UMaG candidates and a listsummarizing 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.
|
Додај нови чланак
Линкови у сродству са темом
Додај нови линк
Чланови следећих група \:
|
Посматрања и Астрометриски подаци
Сазвежђа: | Рибе |
Ректацензија: | 00h42m50.41s |
Deклинација: | +03°20'08.0" |
Apparent магнитуда: | 8.99 |
Proper motion RA: | 2.1 |
Proper motion Dec: | -3 |
B-T magnitude: | 9.478 |
V-T magnitude: | 9.031 |
Каталог и designations:
|