3 research outputs found
The mass of the black hole in 1A 0620–00, revisiting the ellipsoidal light curve modelling
The mass distribution of stellar mass black holes can provide important clues
to supernova modeling, but observationally it is still ill constrained.
Therefore it is of importance to make black hole mass measurements as accurate
as possible. The X-ray transient 1A 0620-00 is well studied, with a published
black hole mass of M, based on an orbital inclination
of degrees. This was obtained by Cantrell et al. (2010), as an
average of independent fits to -, - and -band light curves. In this
work we perform an independent check on the value of by re-analyzing
existing YALO/SMARTS -, - and -band photometry, using different
modeling software and fitting strategy. Performing a fit to the three light
curves simultaneously, we obtain a value for of degrees,
resulting in a black hole mass of M. Applying the same
model to the light curves individually, we obtain ,
and degrees for -, - and -band, respectively, where the
differences in best-fitting are caused by the contribution of the residual
accretion disc light in the three different bands. We conclude that the mass
determination of this black hole may still be subject to systematic effects
exceeding the statistical uncertainty. Obtaining more accurate masses would be
greatly helped by continuous phase-resolved spectroscopic observations
simultaneous with photometry.Comment: 9 pages, 5 figures, 2 tables, accepted for publication in MNRA
IGR J19308+0530: Roche lobe overflow on to a compact object from a donor 1.8 times as massive
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111353.pdf (preprint version ) (Open Access