Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....114.1227f&link_type=abstract
The Astronomical Journal, v. 114, p. 1227.
Astronomy and Astrophysics
Astronomy
2
Ultraviolet: Stars, Stars: Atmospheres
Scientific paper
Observations of the post-common envelope binary system BE UMa are presented and analyzed. Neutral hydrogen absorption precluded any chance of detection except over the wavelength range δδ 80-120. We observed BE Ursae Majoris for 55 875 s with the short-wave spectrometer aboard the Extreme Ultraviolet Explorer satellite and failed to detect the object. Comparison of our null measurement with the pure H/He best-fit sdO/DAO models of Liebert et al. (1995, ApJ, 441, 424) and new mixed-metallicity models indicates that at the minimum a detectable deficit in continuum strength in this wavelength region does indeed exist, even after allowing for worst-case neutral hydrogen absorption along the line of sight. We attribute this quenching to the presence of metals and estimate nmetals/nH>O.O1, where nmetals/nH is the ratio of metals to hydrogen number densities. Further, the He/H ratio is consistent with the solar value.
Ferguson Donald H.
Haas Stefan
Liebert James
Napiwotzki Ralf
Tweedy Richard W.
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