The mass ratio of Nova MUSCAE 1991

Bibcode
1997NewA....1..299C
DOI
10.1016/S1384-1076(96)00022-X
Casares, J.; Martin, E. L.; Charles, P. A.; Molaro, P.; Rebolo, R.
Bibliographical reference

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

Advertised on:
3
1997
Journal
New Astronomy
Number of authors
5
IAC number of authors
2
Citations
59
Refereed citations
52
Description
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.
Type
Refereed
Accretion
Black hole physics

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