The Coolest X-ray Emitting White Dwarfs?

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

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007cxo..prop.2336a&link_type=abstract

Chandra Proposal ID #09200403

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Chandra Proposal Id #09200403

Scientific paper

Among the ~6000 new white dwarfs (WDs) spectroscopically confirmed by the Sloan Digital Sky Survey (SDSS) are three cool DAs and two cool DBs within 1' of super-soft ROSAT All-Sky Survey (RASS) sources. WDs at these relatively low temperatures (<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~22 mag in photometry). We propose a total of 25 ksec of Chandra observations of these five SDSS WDs to obtain pinpoint X-ray positions and improved flux measures for these objects. If Chandra data confirm that the five WDs are X-ray sources, they will be of great interest; in particular, work will be required to explain how such cool WDs can emit X rays.

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