Discovery of Five New R Coronae Borealis Stars in the MACHO Galactic Bulge Database

Details Discovery of Five New R Coronae Borealis Stars in the MACHO Galactic Bulge Database Discovery of Five New R Coronae Borealis Stars in the MACHO Galactic Bulge Database

2005-07-22

arxiv.org/abs/astro-ph/0507554v3

Astron.J.130:2293-2302,2005

Astronomy and Astrophysics

Astrophysics

16 pages, 5 figures, AJ in press High resolution versions of Figures 1 and 2 can be downloaded from http://morpheus.phys.lsu.e

Scientific paper

10.1086/466516

We have identified five new R Coronae Borealis (RCB) stars in the Galactic bulge using the MACHO Project photometry database, raising the total number of known Galactic RCB stars to about 40. We have obtained spectra to confirm the identifications. The fact that four out of the five newly identified RCB stars are ``cool'' (T(eff) < 6000 K) rather than ``warm'' (T(eff) > 6000 K) suggests that the preponderance of warm RCB stars among the existing sample is a selection bias. These cool RCB stars are redder and fainter than their warm counterparts and may have been missed in surveys done with blue plates. Based on the number of new RCB stars discovered in the MACHO bulge fields, there may be ~250 RCB stars in the reddened "exclusion" zone toward the bulge.

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