Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103..573r&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 103, Feb. 1992, p. 573-578.
Astronomy and Astrophysics
Astronomy
12
B Stars, Binary Stars, Stellar Spectrophotometry, Ultraviolet Astronomy, Centaurus Constellation, Extreme Ultraviolet Radiation, Helium, Light Curve, Stellar Evolution, Stellar Orbits
Scientific paper
New high-quality observations of this unusual early type contact binary are presented. BVRI photometry of SV Cen provides a precise moment of minimum in March 1990. From high-resolution profiles of the He I line at 492.1 nm a new, improved set of orbital parameters was derived. Intrinsic line profile variability was not detected in either component and both photometry and spectroscopy. Low-noise spectra of the region around He II 468.6 nm showed no feature at any orbital phase, thus not giving a clue on the location of the source of a far-UV flux excess previously inferred from IUE observations. Since, for technical reasons, simultaneous EUV spectrophotometry with the Voyager spacecraft was lost, the temperature of this possible ultrahot spot could not be further constrained.
Baade Dietrich
Lu Wen-Xian
Rucinski Slavek M.
Udalski Andrzej
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