CE 315: A New Interacting Double‐Degenerate Binary Star | Zendy

M. T. Ruíz | Zendy; P. Rojo | Zendy; Guido Garay | Zendy; J. Maza | Zendy

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CE 315: A New Interacting Double‐Degenerate Binary Star

Author(s) -

M. T. Ruíz,

P. Rojo,

Guido Garay,

J. Maza

Publication year - 2001

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/320578

Subject(s) - white dwarf , physics , degenerate energy levels , astrophysics , binary number , helium , emission spectrum , mass ratio , binary system , astronomy , stars , spectral line , atomic physics , arithmetic , mathematics , quantum mechanics

We present spectroscopic observations of object CE-315 revealing a bluecontinuum with strong emission lines. Most of the detected lines are identifiedwith He I or He II in emission with a handful of faint lines of nitrogen.Notable is the complete absence of hydrogen lines. The He lines exhibittriple-peaked profiles with remakably broad widths, of about 2000 km/s (FWZP). The observations show that CE-315 is an interacting binary system with anorbital period of 65.1 +/- 0.7 minutes, and a mass ratio of 0.022. We concludethat the most likely scenario for this object is that of an accreting 0.77solar mass white dwarf with a 0.017 solar mass helium white dwarf as massdonor.Comment: Astrophysical Journal, 20 page

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