SPECTROSCOPY from the H UBBLE SPACE TELESCOPE COSMIC ORIGINS SPECTROGRAPH of the SOUTHERN NOVA-LIKE BB DORADUS in AN INTERMEDIATE STATE

Patrick Godon, Edward M. Sion, Boris T. Gänsicke, Ivan - Hubeny, Domitilla De Martino, Anna F. Pala, Pablo Rodríguez-Gil, Paula Szkody, Odette Toloza

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Abstract

We present a spectral analysis of the spectrum from the Hubble Space Telescope Cosmic Origins Spectrograph (HST/COS) of the southern VY Scl nova-like variable BB Doradus, obtained as part of a Cycle 20 HST/COS survey of accreting white dwarfs (WDs) in cataclysmic variables. BB Dor was observed with COS during an intermediate state with a low mass accretion rate, thereby allowing an estimate of the WD temperature. The results of our spectral analysis show that the WD is a significant far-ultraviolet (FUV) component of the spectrum with a temperature of about 35,000-50,000 K, assuming a WD mass of 0.80 MȮ(log(g)=8.4). The disk, with a mass accretion rate of ≈10-10 MȮ, contributes about 1/5 to 1/2 of the FUV flux.

Original languageEnglish (US)
Article number146
JournalAstrophysical Journal
Volume833
Issue number2
DOIs
Publication statusPublished - Dec 20 2016

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Keywords

  • accretion, accretion disks
  • binaries: close
  • novae, cataclysmic variables
  • stars: individual (BB Doradus)
  • ultraviolet: stars
  • white dwarfs

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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