Supersoft X-ray source CAL 83 in an optical-high, X-ray off state

Details Supersoft X-ray source CAL 83 in an optical-high, X-ray off state Supersoft X-ray source CAL 83 in an optical-high, X-ray off state

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008atel.1357....1g&link_type=abstract

The Astronomer's Telegram, #1357

Astronomy and Astrophysics

Astronomy

2

Optical, Ultra-Violet, X-Ray, Binaries, Variables

Scientific paper

Between Dec. 20 and 27, 2007, the optical (B&R) brightness of CAL 83 jumped up by 0.5 mag, and stayed at that level since then. With the anti- correlation in mind of optical and X-ray flux as indicated by MACHO data and earlier Chandra and XMM observations (Greiner & DiStefano 2002, A&A 387, 944), we performed a 4.7 ksec Swift ToO observation on January 2, 2008, between 0:00--6:00 UT. As expected, we find no X-ray emission from CAL 83, with a 2-sigma upper limit of 6.1*10-4 cts/s in the <1.0 keV band.

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