On the mass of the compact object in GRO J0422+32

Bibcode
1995MNRAS.276L..35C
Casares, J.; Martin, A. C.; Charles, P. A.; Martin, E. L.; Rebolo, R.; Harlaftis, E. T.; Castro-Tirado, A. J.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society, Volume 276, Issue 3, pp. L35-L39.

Advertised on:
10
1995
Journal
Monthly Notices of the Royal Astronomical Society
Number of authors
7
IAC number of authors
3
Citations
56
Refereed citations
49
Description
We report the detection of the secondary star spectrum in the hard X-ray transient GRO J0422+32 during its lowest quiescent state. From the amplitude of the radial velocity curve we derive a mass function f(M)=0.85+/-0.30M_solar. We classify the companion star as type M2+/-2V which contributes 35+/-6 per cent of the total flux in the spectral range lambdalambda6000-6500 and 52+/-8 per cent in the range lambdalambda6700-7500. Ellipsoidal modulation fits to the I-band light curves constrain the inclination to be between 41 deg+/-6 deg and 43 deg+/-6 deg for mass ratios q(=M_x/M_c)=10-5. We show that the primary is likely to be a low-mass black hole with a probable mass of ~=2.5-5M_solar.
Type
Refereed
Accretion

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