IUE observations of UB-bright stars in M 3.
Abstract
IUE UV observations of three "UV-bright" stars in M3 are presented. The brightest object - vZ1128 - is confirmed to be a bright Post-AGB star with logL/Lsun=3.09 and Te=30,000 K, which contributes about 25% of the integrated UV light from the cluster at λ=1500Å. The nature of the two other stars, i.e. 524 (logL/Lsun=2.06, Te=33,000 K) and 7561 (iogL/Lsun=2.04, Te=35,000 K), is still controversial. They might be respectively AGB-manque' stars of the sort suggested by Greggio & Renzini (1990), or the result of mergers of binary systems according to Iben (1990), but other possibilities are considered and discussed.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- February 1992
- Bibcode:
- 1992A&A...254..110B
- Keywords:
-
- Clusters: globular;
- Stars: evolution of;
- Stars: luminosities of;
- Stars: temperatures of;
- UV radiation