Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...306..599c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 306, July 15, 1986, p. 599-604. NSF-supported research.
Astronomy and Astrophysics
Astrophysics
30
Astronomical Photometry, Eclipsing Binary Stars, Novae, X Ray Binaries, Astronomical Spectroscopy, Light Curve, Line Spectra, Stellar Spectra
Scientific paper
Photometric observations of the X-ray nova 0748-676 show that optical eclipses occur in phase with the X-ray eclipses. In addition, the light curve shows considerable modulation throughout the 3.8 hr orbital period. Spectra show emission lines of H and He II which vary in velocity, intensity, and profile throughout the orbital cycle. The phasing of the velocity variations suggests that the emission lines are formed in the vicinity of the compact star. However the lines are very weak, and accurate velocities cannot be determined from the data. Curiously, the emission lines have maximum flux near phase 0 (eclipse), indicating they cannot arise principally in the region which is eclipsed.
Cowley Anne Pyne
Crampton David
Hutchings John B.
Ianna Phil
Stauffer John
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