The mass ratio of Nova MUSCAE 1991

Details The mass ratio of Nova MUSCAE 1991 The mass ratio of Nova MUSCAE 1991

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997newa....1..299c&link_type=abstract

New Astronomy, vol. 1, no. 4, p. 299-310.

Physics

37

Accretion, Accretion Disks, Binaries: Close, Black Hole Physics, X-Rays: Stars, Stars: Individual: Nova Mus 1991

Scientific paper

We report intermediate resolution H alpha spectroscopy of the black hole candidate Nova Muscae 1991 during quiescence. We classify the companion star as a K3-K4V which contributes 85 plusmn 6 percent to the total flux from the binary. The photospheric absorption lines are broadened by 106 plusmn 13 km s^-1 with respect to template field stars, leading to a system mass ratio of q = M_1/M_2 = 7.8^+3.4_-2.0. Doppler imaging of the H alpha line shows strong emission coming from the secondary star (EW = 3.1 plusmn 0.6 Angstrom) which we associate with chromospheric activity. However, the hot-spot is not detected and this may indicate a lower mass transfer rate than in other X-ray transients of comparable orbital periods. The surface brightness distribution of the accretion disk in H alpha follows a relation I propto R^-1.1, less steep than typically observed in cataclysmic variables. Updated system parameters are also presented.

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