Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasp..110.1315g&link_type=abstract
The Publications of the Astronomical Society of the Pacific, Volume 110, Issue 753, pp. 1315-1317.
Astronomy and Astrophysics
Astronomy
Stars: Binaries: Close, Stars: Early-Type, Stars: Individual: Henry Draper Number: Hd 49798, Stars: Subdwarfs, X-Rays
Scientific paper
The spectrum of the sdO star HD 49798 was monitored for a week in 1995 December with the Helen Sawyer Hogg Telescope of the University of Toronto Southern Observatory. The resolution of the spectra is 1.7 Å pixel^-1. A new spectral type of sdO5.5 has been determined. Some subtle changes may be attributable to the X-ray pulsating companion, but no gross changes were observed on timescales of days, hours, or tens of minutes.
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