A ground-based proper motion study of 12 nearby globular clusters
Abstract
We derive relative proper motions of stars in the fields of the globular clusters M12, NGC 6362, M4, M55, M22, NGC 6752, NGC 3201, M30, M10, NGC 362, M5 and 47 Tucanae based on data collected between 1997 and 2015 with the 1-m Swope telescope of Las Campanas Observatory. We determine membership class and membership probability for over 446 000 objects, and show that these are efficient methods for separating field stars from members of the cluster. In particular, membership probabilities of variable stars and blue/yellow/red stragglers are determined. Finally, we find absolute proper motions for six globular clusters from our sample: M55, NGC 3201, M10, NGC 362, M5 and 47 Tuc. An electronic catalogue of the derived proper motions is publicly available via the internet.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- October 2017
- DOI:
- 10.1093/mnras/stx1637
- arXiv:
- arXiv:1706.09612
- Bibcode:
- 2017MNRAS.471.1446N
- Keywords:
-
- astrometry;
- blue stragglers;
- globular clusters: individual: M12;
- globular clusters: individual: NGC 6362;
- globular clusters: individual: M4;
- globular clusters: individual: M55;
- globular clusters: individual: M22;
- globular clusters: individual: NGC 6752;
- globular clusters: individual: NGC 3201;
- globular clusters: individual: M30;
- globular clusters: individual: M10;
- globular clusters: individual: NGC 362;
- globular clusters: individual: M5;
- globular clusters: individual: 47 Tucanae;
- Astrophysics - Solar and Stellar Astrophysics;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 24 pages, 35 figures, 6 tables. Accepted for publication in MNRAS. Figures of high quality on request