The Coolest X-ray Emitting White Dwarfs?

Details The Coolest X-ray Emitting White Dwarfs? The Coolest X-ray Emitting White Dwarfs?

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008xmm..prop...19a&link_type=abstract

XMM-Newton Proposal ID #06009203

Other

Stars, White Dwarfs, Solar System, Rxs 120428.0+58, Rxs J101340.6+0

Scientific paper

Among the ~6000 new white dwarfs (WDs) spectroscopically confirmed by the Sloan Digital Sky Survey (SDSS) are three cool DAs within 1' of super-soft ROSAT All-Sky Survey (RASS) sources. WDs at these relatively low temperatures (below 23,000 K) are not expected to be X-ray emitters, but the SDSS photometric and spectroscopic data fail to identify any other obvious optical counterparts to the RASS sources to the SDSS limits (g~23 mag in photometry). We propose 6 ksec XMM-Newton observations of these three SDSS WDs to obtain pinpoint X-ray positions and improved flux measures for these objects. If XMM data confirm that the WDs are X-ray sources, they will be of great interest; in particular, theoretical work will be required to explain how such cool WDs can emit X rays.

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