Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...441..424l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 441, no. 1, p. 424-428
Astronomy and Astrophysics
Astrophysics
23
Cataclysmic Variables, Eclipsing Binary Stars, K Stars, Planetary Nebulae, White Dwarf Stars, Atmospheric Models, Local Thermodynamic Equilibrium, Stellar Models, Stellar Spectrophotometry
Scientific paper
This paper presents new spectrophotometric observations and a new analysis of the hot and cool components of the evolved binary system BE Ursae Majoris, and we report the discovery of a planetary nebula around it. The primary star can be classified as a subdwarf O or borderline DAO white dwarf with Teff = 105,000 K +/- 11,000 K, log g = 6.5 +/- 0.25, based on Non Local Thermodynamic Equilibrium (NLTE) model atmosphere profile fits to the H and He II lines. Observations of the secondary during eclipse indicate a spectral type of K5. Its estimated brightness during eclipse is consistent with a main-sequence star of K5 at the distance of 1.9 kpc derived from analysis of the primary star. The nebula is roughly circular with a diameter of 3 min. This corresponds to a physical diameter of 1.5 pc at the estimated distance.
Fulbright Michael Scott
Liebert James
Napiwotzki Ralf
Tweedy Richard W.
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