Other
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.4402f&link_type=abstract
American Astronomical Society, 180th AAS Meeting, #44.02; Bulletin of the American Astronomical Society, Vol. 24, p.799
Other
Scientific paper
New observations of the hot DA wDs PG0950+139 and PG1413+01 are reported. The object PG0950+139 is observed to have a compact (r<30\ au), dense (ne = 10(6) \ cm(-3) ) nebulosity emitting Balmer lines and forbidden lines such as[OIII]5007. With new JHK photometry the IR excess reported by Zuckerman et al (1991) is confirmed, corresponding to an M dwarf companion of spectral type M4 or later. Our observations set an upper limit of 0.1 mag on the night to night variation in the K magnitude, which indicates the two objects are probably not in a close orbit. There is great uncertainty about how a compact nebulosity could have formed near a wD with a cooling age of order a half a million years. The presense of a stellar companion may offer some clues. The other system, PG1413+01, is a known eclipsing binary with a hot (50000K) DA white dwarf and a late M stellar companion. By fitting model white dwarf atmospheres to the Balmer lines we derive temperature and gravity information for the wD. A red spectrum taken during the eclipse of the wD indicates the companion is an M3--M5 dwarf. The shape of the eclipse light curve is best modelled by an M5 dwarf. The ramifications of these findings on the possibility this system will evolve into a cataclysmic variable are considered.
Fulbright Michael Scott
Liebert James
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