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A Survey for EHB Stars in the Galactic Bulge |
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| Authors: | Donald M Terndrup Deokkeun An Angela Hansen Ruth C Peterson Alistair R Walker Elaine M Sadler |
| Institution: | 1. Department of Astronomy, The Ohio State University, Columbus, OH, 43210, USA 2. Astrophysical Advances, Palo Alto, CA, USA 3. NOAO/CTIO, La Serena, Chile 4. School of Physics, University of Sydney, NSW 2006, Australia |
| Abstract: | We present a progress report on an extensive survey to find and characterize all types of horizontal-branch stars in the nuclear bulge of the Galaxy. We have obtained wide, shallow imaging in UBV of ≈12 square degrees in the bulge, with follow-up spectroscopy for radial velocities and metal abundance determinations. We have discovered a number of metal-rich blue HB stars, whose presence in the bulge is expected by the interpretation of the extragalactic ultraviolet excess. Very deep images have been obtained in UBV and SDSS u along the bulge minor axis, which reveal a significant number of EHB candidates fainter than B=19, i.e., with the same absolute magnitudes as EHB stars in several globular clusters. |
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