The Kepler Light Curve of the Unique DA White Dwarf BOKS 53856

Details The Kepler Light Curve of the Unique DA White Dwarf BOKS 53856 The Kepler Light Curve of the Unique DA White Dwarf BOKS 53856

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aj....142...62h&link_type=abstract

The Astronomical Journal, Volume 142, Issue 2, article id. 62 (2011).

Astronomy and Astrophysics

Astronomy

1

Stars: Individual: Boks 53856, Techniques: Photometric, White Dwarfs

Scientific paper

The faint (g = 16.9) hot white dwarf BOKS 53856 was observed by the Kepler Mission in short cadence mode during mid-2009. Analysis of these observations reveals a highly stable modulation with a period of 6.1375 hr and a 2.46% half-amplitude. The folded light curve has an unusual shape that is difficult to explain in terms of a binary system containing an unseen companion more luminous than an L0 brown dwarf. Optical spectra of BOKS 53856 show a T eff = 34,000 K, log g = 8.0 DA white dwarf. There are few, if any, known white dwarfs in this temperature range exhibiting photometric variations similar to those we describe. A magnetic spin-modulated white dwarf model can in principle explain the light curve, an interpretation supported by spectral observations of the Hα line showing evidence of Zeeman splitting.

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