On Mar 1, Christopher Johnson will give us a talk about:
A Spectral Analysis of the Galactic Bulge Survey X-ray Source CX514
The speaker will begin by giving some background information on the Galactic Bulge Survey (GBS) and then focus on one source in particular, CX514.
Abstract:
We present the spectroscopic and photometric results of the Galactic Bulge Survey (GBS) optical counterpart of the X-ray source CXOGBS J175637.0-271145 (CX514). A refinement of the spectral classification of CX514 has revealed an effective temperature of about 15,000 K and log g = 4.0 which indicates a B6V classification and is unlike the previously labeled B9 classification. A spectroscopic period search of the radial velocity curve revealed a period of 1.3740(61) days which differs from the photometric period found to be 0.8895214(52) days. With the calculation of the dynamic parameters from the radial velocity curve, we find an X-ray source mass of 0.8-0.9 solar masses. This mass constraint, along with the absence of emission in the optical spectra indicates either a white dwarf primary source or an active main sequence type star.
Related paper (not on the exactly same topic, but contains all essential information):
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