Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-06-14
Astrophys.J.647:L135-L138,2006
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures (1 color figure), accepted for publication in ApJ Letters
Scientific paper
10.1086/506613
We have searched the OGLE-II archive for candidate counterparts of X-ray sources detected in two low-extinction windows included in our Galactic bulge Chandra/HST survey. We find that a significant number - i.e. in excess of the expected level of random associations - can be matched with probable M-giants. Their X-ray properties can be understood if these sources are symbiotic binaries where the X-rays are typically, either directly or indirectly, the result of a white dwarf accreting from the wind of a cool giant. Optical and near-infrared properties of selected sources are consistent with a symbiotic nature, although none of the spectra collected for 8 out of 13 candidate counterparts show the high-ionization nebular emission lines observed for many symbiotics. The hard X-ray emission for several sources (power-law photon indices -1.5 ~< Gamma ~< 1.5) suggests our sample includes systems similar to the symbiotics recently detected with INTEGRAL and Swift.
Cohn Henry
Dupree Andrea K.
Grindlay Jonathan
Hong Jongbae
Koenig Xavier
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