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

Research output: Contribution to journalArticle

3 Citations (Scopus)

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
StatePublished - Dec 20 2016

Fingerprint

COSMIC
spectrographs
telescopes
Hubble Space Telescope
spectral analysis
spectrum analysis
accretion
cataclysmic variables
temperature
cycles
estimates
rate

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

Cite this

SPECTROSCOPY from the H UBBLE SPACE TELESCOPE COSMIC ORIGINS SPECTROGRAPH of the SOUTHERN NOVA-LIKE BB DORADUS in AN INTERMEDIATE STATE. / Godon, Patrick; Sion, Edward M.; Gänsicke, Boris T.; Hubeny, Ivan -; De Martino, Domitilla; Pala, Anna F.; Rodríguez-Gil, Pablo; Szkody, Paula; Toloza, Odette.

In: Astrophysical Journal, Vol. 833, No. 2, 146, 20.12.2016.

Research output: Contribution to journalArticle

Godon, Patrick ; Sion, Edward M. ; Gänsicke, Boris T. ; Hubeny, Ivan - ; De Martino, Domitilla ; Pala, Anna F. ; Rodríguez-Gil, Pablo ; Szkody, Paula ; Toloza, Odette. / SPECTROSCOPY from the H UBBLE SPACE TELESCOPE COSMIC ORIGINS SPECTROGRAPH of the SOUTHERN NOVA-LIKE BB DORADUS in AN INTERMEDIATE STATE. In: Astrophysical Journal. 2016 ; Vol. 833, No. 2.
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AU - Pala, Anna F.

AU - Rodríguez-Gil, Pablo

AU - Szkody, Paula

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AB - 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.

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