Optical and UV Spectroscopy of UV Bright Stars (Identified with UIT) in the Globular Cluster M79

Details Optical and UV Spectroscopy of UV Bright Stars (Identified with UIT) in the Globular Cluster M79 Optical and UV Spectroscopy of UV Bright Stars (Identified with UIT) in the Globular Cluster M79

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.7409c&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #74.09; Bulletin of the American Astronomical Society, Vol. 25, p.1407

Astronomy and Astrophysics

Astronomy

Scientific paper

Observations of the globular cluster M79 with the Ultraviolet Imaging Telescope (UIT) have resulted in UV detections of ~ 120 stellar sources, of which 91 are blue or extremely blue horizontal-branch (HB) stars. We present optical spectroscopy, obtained at CTIO, of 11 of these stars, including two hot stars brighter than the HB by at least 1.5 mag at 1520 Angstroms. The star designated UIT1 has the steepest continuum of any uncrowded UV source in the cluster and appears to be on the descending, pre-white dwarf portion of its evolutionary track. It is currently either a post-asymptotic giant branch (post-AGB) star or an extreme HB star that will never reach the AGB. We also present an IUE low-dispersion SWP spectrum of UIT 1. A fit of this spectrum to flux distributions computed from the low-metallicity LTE model atmospheres of Kurucz (1992) is performed with the goal of constraining the poorly known theoretical parameters that govern post-HB evolution. UIT 1 is discussed in terms of the sdO/sdOB/sdB classification scheme for hot subdwarfs.

Affiliated with

Also associated with

No associations

Rating

Optical and UV Spectroscopy of UV Bright Stars (Identified with UIT) in the Globular Cluster M79 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Optical and UV Spectroscopy of UV Bright Stars (Identified with UIT) in the Globular Cluster M79, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical and UV Spectroscopy of UV Bright Stars (Identified with UIT) in the Globular Cluster M79 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-779959