Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996oxun.reptr....s&link_type=abstract
Journal Article, Oxford Univ. Oxford, United Kingdom
Astronomy and Astrophysics
Astronomy
X Ray Binaries, Accretion Disks, Balmer Series, Emission Spectra, H Beta Line, H Alpha Line, X Ray Astronomy, Light Emission, Companion Stars, Neutron Stars, Optical Properties, Astronomical Models, Spectrographs, Spectroscopic Analysis, Heating, Continuums, X Rays
Scientific paper
Broadband optical spectra of a sample of 15 low-mass X-ray binaries (LMXBs) is obtained in the range of 4000-9000 A. The spectra are fitted with combinations of standard accretion disc models and secondary star templates. The slope steepness relating to an optically thick accretion disc and x-ray heating of the outer parts of the disc is discussed for the sample of LMXbs in which the power-law indices of the accretion disk flux distribution were determined. Optical spectra of X1705-250, XB1905+00 and XB1916-053 are presented with optical line emission detected in most of the sample. The Balmer lines H-alpha and H-beta are found to generally be the strongest lines with mean equivalent widths of 3.7 and 1.9 A, respectively. The He(II) Lambda 4686 and the Bowen CIII/NIII blend at Lambda 4640 are also observed, with equivalent widths of 3.0 and 4.1 A, respectively. The Paschen lines are detected in Agl X-1. Theses lines are also present in Cen X-4, GS2000+25. The systems in which stellar features are detected are those in which the companions are evolved and the source in which the mass accretion rate is low.
Callanan Paul
Charles Phil A.
Hassall B. J. M.
Naylor Tim
Paradijs Jan van
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