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• W2037792675 abstract "view Abstract Citations (88) References (50) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Improved Parameters for the Black Hole Binary System X-Ray Nova MUSCAE 1991 Orosz, Jerome A. ; Bailyn, Charles D. ; McClintock, Jeffrey E. ; Remillard, Ronald A. Abstract We have continued to observe the black hole binary X-ray Nova Muscae 1991 (GS 1124 - 683, GU Mus, hereafter XN Mus 91) in quiescence over the last 3 years. These observations have yielded refined values of the orbital period (P = 0d.4326058 ±0d.0000031) and the semiamplitude of the absorption line radial velocity curve (K2 = 406±7 km s-1) The implied mass function is f(M) = 3.01±0.15 Msun, which represents the minimum mass of the compact primary star. A reasonable lower limit on the mass of the primary, based on the lack of observed X-ray and optical eclipses and a previous measurement of the binary mass ratio, is M1 > 4.4 Msun; this mass exceeds the maximum mass of a stable neutron star, reinforcing the argument that XN Mus 91 contains a black hole. The phase-averaged spectrum (Doppler corrected to account for the orbital motion of the secondary) shows strong absorption lines consistent with a dwarf main-sequence star, with an MK type of K3 V-KS V. The disk spectrum, obtained by subtracting the spectrum of a KS V template star from the averaged spectrum, shows strong Balmer emission lines, as well as emission lines of He I and Fe II, which are superimposed on a relatively flat continuum. Ellipsoidal modeling of the light curves indicates that the inclination is in the range 54° ≤ i ≤ 65°. Using the mass function and our previous estimate of the mass ratio, the primary mass is then in the range 5.0 ≤M1 ≤ 7.5 Msun. Publication: The Astrophysical Journal Pub Date: September 1996 DOI: 10.1086/177698 Bibcode: 1996ApJ...468..380O Keywords: STARS: BINARIES: SPECTROSCOPIC; BLACK HOLE PHYSICS; STARS: NOVAE; CATACLYSMIC VARIABLES; STARS: INDIVIDUAL CONSTELLATION NAME: NOVA MUSCAE 1991; X-RAYS: STARS full text sources ADS | data products SIMBAD (10)" @default.
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• W2037792675 title "Improved Parameters for the Black Hole Binary System X-Ray Nova MUSCAE 1991" @default.
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