Apex and Kinematical Structure of Castor and Ursa Major Moving Stellar Groups
Abstract
Based on space velocity components UVW and using a recent dataset for Castor and Ursa Major moving groups, we compute the apex position with two methods. Classical convergent procedures give (Acp, Dcp) = (807830, -172598; Castor, 298334, -346405; UMa) for Castor and Ursa Major groups. According to the AD-map method we deduce the apex position (A0, D0) = (795514, -173948; Castor, 304767, −352045; UMa) for these two objects. These results are in good agreement with other published coordinated. Also, we calculate all parameters with a model of stream velocity ellipsoidal motions, which reveals inner kinematical structure. Finally, we consider the intrinsic variations considered with late-type moving groups (streams) for the longitude of the vertex versus temperature (spectral types).
- Publication:
-
Astronomy Reports
- Pub Date:
- March 2020
- DOI:
- 10.1134/S1063772920030038
- Bibcode:
- 2020ARep...64..199E