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Optical Observations of GRO J1655?40 in Quiescence. I. A Precise Mass for the Black Hole Primary
We report photometric and spectroscopic observations of the black hole binary GRO J1655-40 in complete quiescence. In contrast to the 1995 photometry, the light curves from 1996 are almost completely
Dynamical Evidence for a Black Hole in the Microquasar XTE J1550-564
Optical spectroscopic observations of the companion star (type G8 IV to K4 III) in the microquasar system XTE J1550-564 reveal a radial velocity curve with a best-fitting spectroscopic period of Psp
Optical and Infrared Photometry of the Microquasar GRO J1655-40 in Quiescence
We present BVIJK photometry of the black hole candidate GRO J1655-40 in full quiescence. We report a refined orbital period of 2.62191 ± 0.00020 days. The light curves are dominated by ellipsoidal
The 'universal' radio/X-ray flux correlation : the case study of the black hole GX 339-4
The existing radio and X-ray flux correlation for Galactic black holes in the hard and quiescent states relies on a sample which is mostly dominated by two sources (GX 339-4 and V404 Cyg) observed in
Complete RXTE Spectral Observations of the Black Hole X-ray Nova XTE J1550–564
We report on the X-ray spectral behavior of XTE J1550(564 during its 1998¨1999 outburst. XTE J1550(564 is an exceptionally bright X-ray nova and is also the third Galactic black hole candi- date
Refined Neutron Star Mass Determinations for Six Eclipsing X-Ray Pulsar Binaries
We present an improved method for determining the mass of neutron stars in eclipsing X-ray pulsar binaries and apply the method to six systems, namely, Vela X-1, 4U 1538-52, SMC X-1, LMC X-4, Cen
A 15.65-solar-mass black hole in an eclipsing binary in the nearby spiral galaxy M 33
It is found that the common envelope phase could not have occurred in M 33 X-7 unless the amount of mass lost from the progenitor star during its evolution was an order of magnitude less than what is usually assumed in evolutionary models of massive stars.
A Black Hole in the Superluminal Source SAX J1819.3-2525 (V4641 Sgr)
The B-star secondary is by far the most massive, the hottest, and the most luminous secondary of the dynamically confirmed black hole X-ray transients and V4641 Sgr contains a black hole.
Dynamical evidence for a black hole in the eclipsing X-ray nova GRO J1655 – 40
X-RAY novae are binary systems in which a compact object accretes gas from a companion star. In several cases there is good evidence that the compact object is a black hole1–5. The best evidence for
An Improved Dynamical Model for the Microquasar XTE J1550–564
We present an improved dynamical model of the X-ray binary and microquasar XTE J1550?564 based on new moderate-resolution optical spectroscopy and near-infrared photometry obtained with the 6.5?m