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The ultraviolet-bright stars of Omega Centauri, M3, and M13Two new UV-bright stars detected within 2 arcmin of the center of Omega Cen are spectroscopically investigated with the short-wavelength spectrograph of the IUE. The IUE spectra of the UV-bright stars UIT-1 and UIT-2 in the core of Omega Cen superficially resemble those of Population I mid-B stars. The absorption lines of the core UV-bright stars are significantly weaker than in Population I stars, consistent with their membership in the cluster. Synthetic spectra calculated from low-metallicity Kurucz model stellar atmospheres are compared with the spectra. These objects are insufficiently luminous to be classical hydrogen-burning post-AGB stars. They may be evolved hot horizontal branch stars which have been brightened by more than 3 mag since leaving the zero-age horizontal branch. It is inferred from the spectra and luminosity of the core UV-bright stars that similar objects could provide the source of the UV light in elliptical galaxies.
Document ID
19930028537
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Landsman, Wayne B.
(Hughes STX Corp. Greenbelt, MD, United States)
O'Connell, Robert W.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Whitney, Jonathan H.
(Virginia Univ. Charlottesville, United States)
Bohlin, Ralph C.
(Space Telescope Science Inst. Baltimore, MD, United States)
Hill, Robert S.
(Hughes STX Corp. Greenbelt, MD, United States)
Maran, Stephen P.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Parise, Ronald A.
(Computer Science Corp. Greenbelt, MD, United States)
Roberts, Morton S.
(National Radio Astronomy Observatory Charlottesville, VA, United States)
Smith, Andrew A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Stecher, Theodore P.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 15, 2013
Publication Date
August 10, 1992
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 395
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A12534
Funding Number(s)
CONTRACT_GRANT: NAG5-700
CONTRACT_GRANT: NAGW-2596
Distribution Limits
Public
Copyright
Other

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