Velocity-space Substructure of the Local Galactic Halo from K and M Dwarfs and Subdwarfs in the SUPERBLINK and Gaia Catalogs
Authors/Creators
- 1. Department of Physics and Astronomy, Georgia State University, Atlanta, GA, United States
Contributors
Editor:
Description
We present a study of the kinematics of nearby (d ≲ 1.2 kpc) high-velocity K and M dwarfs and subdwarfs from the SUPERBLINK proper motion catalog (μ > 40 mas/yr), incorporating data from the second Gaia Data Release 2. All K and M stars were selected based on their GBP - GRP colors and absolute G magnitudes, and distances were calculated from Gaia parallaxes. We plot transverse velocities, vT, of stars in six different directions on the sky, to examine the distribution of local K and M stars in the (U, V, W) velocity space system. Our analysis suggests that the velocity space distribution of local thick disk and halo stars, much like the velocity-space distribution of disk stars, is inhomogeneous and shows the signature of at least one global "stream" consisting of stars drifting toward Galactic center.
Files
poster_cs20.pdf
Files
(4.7 MB)
| Name | Size | Download all |
|---|---|---|
|
md5:4ef25cbe6f54ddb1f1f34a022997378c
|
2.5 MB | Preview Download |
|
md5:bbac1081e6dc3f75ee3277373d7a7bc3
|
2.3 MB | Preview Download |
Additional details
References
- Bensby et al., 2014, A&A, 562, 71
- Gaia Collaboration, 2016, A&A, 595, 1
- Gaia Collaboration, 2018b, arXiv:1804.09365
- Gaia Collaboration: A. Helmi, F. van Leeuwen, P. McMillan, et al., 2018, arXiv:1804.09381
- Helmi et al., 1999, Nature, 402, 53
- Lepine, S. & Shara, M. M., 2005, AJ, 129, 1483
- Lepine, S., 2005, AJ, 130, 1247
- Lepine, S. & Gaidos, E., 2011, AJ, 142, 138