Be Ursae Majoris: Precataclysmic binary system and planetary nucleus

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view Abstract Citations (33) References (28) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS BE Ursae Majoris: Precataclysmic Binary System and Planetary Nucleus Liebert, James ; Tweedy, R. W. ; Napiwotzki, R. ; Fulbright, M. S. Abstract 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. Publication: The Astrophysical Journal Pub Date: March 1995 DOI: 10.1086/175366 Bibcode: 1995ApJ...441..424L Keywords: Cataclysmic Variables; Eclipsing Binary Stars; K Stars; Planetary Nebulae; White Dwarf Stars; Atmospheric Models; Local Thermodynamic Equilibrium; Stellar Models; Stellar Spectrophotometry; Astronomy full text sources ADS | data products SIMBAD (1)

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