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Ultraviolet Imaging of the Globular Cluster 47 Tucanae | | Robert W. O’Connell
; Ben Dorman
; Ronak Y. Shah
; Robert T. Rood
; Wayne B. Landsman
; Ralph C. Bohlin
; Susan G. Neff
; Morton S. Roberts
; Andrew M. Smith
; Theodore P. Stecher
; | | Date: |
4 Apr 1997 | | Subject: | astro-ph | | Affiliation: | 1,2), Ronak Y. Shah , Robert T. Rood , Wayne B. Landsman , Ralph C. Bohlin , Susan G. Neff , Morton S. Roberts , Andrew M. Smith, Theodore P. Stecher (1: U. Virginia, 2: LASP, NASA/GSFC, 3: Hughes/STX, 4: STSci, 5: NRAO | | Abstract: | We have used the Ultraviolet Imaging Telescope to obtain deep far-UV (1620 Angstrom), 40’ diameter images of the prototypical metal-rich globular cluster 47 Tucanae. We find a population of about 20 hot (Teff > 9000 K) objects near or above the predicted UV luminosity of the hot horizontal branch (HB) and lying within two half-light radii of the cluster center. We believe these are normal hot HB or post-HB objects rather than interacting binaries or blue stragglers. IUE spectra of two are consistent with post-HB phases. These observations, and recent HST photometry of two other metal-rich clusters, demonstrate that populations with rich, cool HB’s can nonetheless produce hot HB and post-HB stars. The cluster center also contains an unusual diffuse far-UV source which is more extended than its V-band light. It is possible that this is associated with an intracluster medium, for which there was earlier infrared and X-ray evidence, and is produced by C IV emission or scattered light from grains. | | Source: | arXiv, astro-ph/9704042 | | Services: | Forum | Review | PDF | Favorites | |
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