Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-06-26
Astronomy and Astrophysics
Astrophysics
uuencoded compressed file with 15 pages + 1 table and 6 postscript figures. Accepted by Ap J. Also available at http://www.h
Scientific paper
Details of simultaneous photometric and spectroscopic observations of the optical counterpart of the `supersoft' X-ray source 1E 0035.4-7230 (SMC 13) are presented. Although the spectrum is dominated by emission lines of He II, the Balmer series of hydrogen is also present in emission with a strong decrement, and Balmer lines are seen as broad absorptions. Several high ionization emission features are also present including O VI (3811, 3834, and 5290A). Radial velocities and photometry confirm that the binary period is ~0.1719d, and an improved value of the period is derived from four years of photometry and analysis of ROSAT-HRI X-ray data. The orbital light variation is primarily due to an eclipse of the extensive accretion disk. X-ray and optical minima occur together. The UBV light curves are similar to each other, and no clear phase-related color variations are found. He II emission-line velocities show a semi-amplitude of K ~100 km/s, and maximum velocity occurs when the light curve indicates the compact star would be moving away from the observer, suggesting this emitting region may trace the orbital motion of the compact star. The range of possible masses implied for the X-ray source lies between 0.5 and 1.5 solar masses if the mass donor is a main sequence star filling its Roche lobe. The light curve suggests values at the high end of this range. The broad H absorption lines appear to have a much larger velocity amplitude and lower systemic velocity, making it difficult to understand their origin. We discuss possible models for the system.
Cowley Anne Pyne
Crampton David
Hutchings John B.
Schmidtke Paul C.
No associations
LandOfFree
The SMC Supersoft X-ray Binary 1E 0035.4-7230 (SMC 13) does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The SMC Supersoft X-ray Binary 1E 0035.4-7230 (SMC 13), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The SMC Supersoft X-ray Binary 1E 0035.4-7230 (SMC 13) will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-331769