A Survey for EHB Stars in the Galactic Bulge

Details A Survey for EHB Stars in the Galactic Bulge A Survey for EHB Stars in the Galactic Bulge

2003-09-25

arxiv.org/abs/astro-ph/0309700v1

Astrophys.Space Sci.291:247-252,2004

Astronomy and Astrophysics

Astrophysics

To appear in "Extreme Horizontal Branch Stars and Related Objects", Astrophysics and Space Science, Kluwer Academic Publishers

Scientific paper

10.1023/B:ASTR.0000044328.04425.

We present a progress report on an extensive survey to find and characterize all types of blue 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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