Bours, Madelon C. P., Marsh, T. R., Gänsicke, B. T. (Boris T.) and Parsons, S. G. (2015) HST+COS spectra of the double white dwarf CSS 41177 place the secondary inside the pulsational instability strip. Monthly Notices of the Royal Astronomical Society, 448 (1). pp. 601-605. doi:10.1093/mnras/stv021

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Abstract

We present Hubble Space Telescope + Cosmic Origins Spectrograph (HST+COS) data of the eclipsing double white dwarf binary CSS 41177. Due to the temperature difference between the two white dwarfs, the HST+COS far-ultraviolet data are dominated by the hot, primary white dwarf and allow us to precisely measure its temperature (T1). Using eclipse observations, we also tightly constrain the temperature of the cooler secondary white dwarf (T2). Our results, where T1 = 22 439 ± 59 K and T2 = 10 876 ± 32 K, with the uncertainties being purely statistical, place the secondary inside and close to the blue edge of the empirical instability strip for low-temperature hydrogen-atmosphere white dwarfs. Dedicated high-speed photometry is encouraged to probe for the presence of pulsations, which will constrain the border of the instability strip as well as probe a new region of low gravity within the strip.

Item Type:	Journal Article
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	Oxford University Press
ISSN:	0035-8711
Official Date:	21 March 2015
Dates:	Date Event 21 March 2015 Published 6 February 2015 Available 5 January 2015 Accepted 5 January 2015 Submitted
Volume:	448
Number:	1
Page Range:	pp. 601-605
DOI:	10.1093/mnras/stv021
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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