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

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

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.276l..35c&link_type=abstract

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

Astronomy and Astrophysics

Astronomy

42

Accretion, Accretion Discs, Binaries: Close, Binaries: Spectroscopic, Stars: Individual: Gro J0422+32, X-Rays: Stars

Scientific paper

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.

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