Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541911k&link_type=abstract
American Astronomical Society, AAS Meeting #215, #419.11; Bulletin of the American Astronomical Society, Vol. 42, p.278
Other
Scientific paper
We present near-infrared (NIR) broadband (0.80--2.42 μm) spectra of two low mass X-ray binaries: V404 Cyg and Cen X-4. One important parameter required in the determination of the mass of the compact object in these systems is the binary inclination. We can determine the inclination by modeling the ellipsoidal modulations of the Roche-lobe filling donor star, but the contamination of the donor star light from other components of the binary, particularly the accretion disk, must be taken into account. To this end, we determine the donor star contribution to the infrared flux by comparing the spectra of V404 Cyg and Cen X-4 to those of various field K-stars of known spectral type. For V404 Cyg, we determined that the donor star has a spectral type of K3III. We determined the fractional donor contribution to the NIR flux in the H- and K-bands as 0.98 ± .05 and 0.97 ± .09, respectively. We remodeled the H-band light curve from Sanwal et al. (1996) after correcting for the donor star contribution to obtain a new value for the binary inclination. From this, we determined the mass of the black hole in V404 Cyg to be 9.0±.7 M&sun;. We performed the same spectral analysis for Cen X-4 and found the spectral type of the donor star to be in the range K7-M1V. The donor star contribution in Cen X-4 is 0.92±.02 in the H-band and 0.96±.15 in the K-band. We remodeled the H-band light curve from Shahbaz et al. (1993), again correcting for the fractional contribution of the donor star to obtain the inclination. From this, we determined the mass of the neutron star as 1.4±0.2 M&sun;.
Froning Cynthia S.
Khargharia Juthika
Robinson Emma L.
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