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Orbital period changes in RW CrA, DX Vel and V0646 Cen
Chochol, D.; Mašek, M.; Volkov, I. M. +2 more
We aim to determine the absolute parameters of the components of southern Algol-type binaries with deep eclipses RW CrA, DX Vel, V0646 Cen and interpret their orbital period changes. The data analysis is based on a high quality Walraven photoelectric photometry, obtained in the 1960-70s, our recent CCD photometry, ASAS (Pojmanski, 2002), and Hippa…
First results from the use of the relativistic and slim disc model SLIMULX in XSPEC
Castro-Tirado, A. J.; Dovčiak, M.; Karas, V. +3 more
Ultra-Luminous X-ray sources (ULXs) are accreting black holes for which their X-ray properties have been seen to be different to the case of stellar-mass black hole binaries. For most of the cases their intrinsic energy spectra are well described by a cold accretion disc (thermal) plus a curved high-energy emission components. The mass of the blac…