V458 Vul (Nova Vul 2007) becomes a highly-variable supersoft X-ray source

Details V458 Vul (Nova Vul 2007) becomes a highly-variable supersoft X-ray source V458 Vul (Nova Vul 2007) becomes a highly-variable supersoft X-ray source

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008atel.1721....1d&link_type=abstract

The Astronomer's Telegram, #1721

Astronomy and Astrophysics

Astronomy

7

Ultra-Violet, X-Ray, Novae

Scientific paper

Swift X-ray Telescope (XRT) monitoring observations of V458 Vul (Nova Vul 2007, S. Nakano, IAUC 8861) have found it to be entering a new phase characterised by a highly variable supersoft X-ray component accompanied by partially anti-correlated variations in the ultraviolet. An earlier report of entry into the supersoft phase (ATel #1246) has proven premature. XRT observations obtained from 2008 June 18 - September 1 found the nova to have declined in X-ray luminosity by a factor of 3 to an average of 0.02 count/s in the 0.3-10 keV band compared with the 2007 November-December period (ATel #1603).

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