A deeply eclipsing detached double helium white dwarf binary
Parsons, S. G., Marsh, T. R., Gaensicke, B. T., Drake, A. J. and Koester, Detlev. (2011) A deeply eclipsing detached double helium white dwarf binary. The Astrophysical Journal. Letters, Vol.735 (No.2). L30. ISSN 2041-8205Full text not available from this repository.
Official URL: http://dx.doi.org/10.1088/2041-8205/735/2/L30
Using Liverpool Telescope+RISE photometry we identify the 2.78 hr period binary star CSS 41177 as a detached eclipsing double white dwarf binary with a 21,100 K primary star and a 10,500 K secondary star. This makes CSS 41177 only the second known eclipsing double white dwarf binary after NLTT 11748. The 2 minute long primary eclipse is 40% deep and the secondary eclipse 10% deep. From Gemini+GMOS spectroscopy, we measure the radial velocities of both components of the binary from the Ha absorption line cores. These measurements, combined with the light curve information, yield white dwarf masses of M(1) = 0.283 +/- 0.064 M(circle dot) and M(2) = 0.274 +/- 0.034 M(circle dot), making them both helium core white dwarfs. As an eclipsing, double-lined spectroscopic binary, CSS 41177 is ideally suited to measuring precise, model-independent masses and radii. The two white dwarfs will merge in roughly 1.1 Gyr to form a single sdB star.
|Item Type:||Journal Article|
|Subjects:||Q Science > QB Astronomy|
|Divisions:||Faculty of Science > Physics|
|Library of Congress Subject Headings (LCSH):||Double stars, Eclipsing binaries, Stars, White dwarf stars|
|Journal or Publication Title:||The Astrophysical Journal. Letters|
|Publisher:||Institute of Physics Publishing, Inc.|
|Access rights to Published version:||Restricted or Subscription Access|
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