Stars Above the Red Horizontal Branch in M15

Details Stars Above the Red Horizontal Branch in M15 Stars Above the Red Horizontal Branch in M15

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pasp..109..274h&link_type=abstract

Publications of the Astronomical Society of the Pacific, v.109, p.274-278

Astronomy and Astrophysics

Astronomy

2

Globular Clusters: Individual: M15, Stars: Horizontal-Branch

Scientific paper

We observed thirteen objects first identified by Silbermann and Smith (1995) as being above the red horizontal-branch in the color-magnitude diagram of M15. From vby images taken at CTIO, we used the dereddened metallicity index, mo, to select for metal-poor cluster members. We judge that six out of the original thirteen objects are cluster members: four objects moved back to the red giant or asymptotic giant branches, while two stars remained above the red horizontal-branch. From examination of oxygen-enhanced horizontal-branch sequences, the latter two objects (as well as several other metal-poor objects) are likely to be in a post-horizontal-branch evolutionary stage, evolving towards the asymptotic giant branch. Also, we identify an object which may be a post-AGB or blue-loop star. (SECTION: Stellar Clusters and Associations)

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