IUE spectrophotometry of the DA4 primary in the short-period white dwarf-red dwarf spectroscopic binary Case 1

Abstract

view Abstract Citations (26) References (37) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS IUE spectrophotometry of the DA4 primary in the short-period white dwarf red dwarf spectroscopic binary Case 1. Sion, E. M. ; Wesemael, F. ; Guinan, E. F. Abstract Low-resolution ultraviolet International Ultraviolet Explorer spectra of the DA white dwarf Case 1 are presented. The spectra show the presence of the 1400 A feature, already discovered in several other DA stars, and of a shallower trough in the 1550-1700 A range. A model atmosphere analysis of the ultraviolet energy distribution of the Ly-alpha red wing yields T(e) = 13,000 + or - 500 K. Possible interpretations of the 1400 A feature are reviewed. Case 1 is the coolest white dwarf found in a short-period, detached white dwarf-red dwarf binary, and its cooling time is consistent with estimates of the efficiency of angular momentum removal mechanisms in the phases subsequent to common envelope binary evolution. Publication: The Astrophysical Journal Pub Date: April 1984 DOI: 10.1086/161944 Bibcode: 1984ApJ...279..758S Keywords: Binary Stars; Red Dwarf Stars; Satellite Observation; Stellar Spectrophotometry; Ultraviolet Spectra; White Dwarf Stars; Angular Momentum; Iue; Spectral Energy Distribution; Stellar Evolution; Stellar Spectra; Stellar Temperature; Ultraviolet Astronomy; Astrophysics full text sources ADS | data products SIMBAD (18) MAST (1) INES (1)