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First detection of x-ray variability of eta carinae (1995)

Corcoran, M. F. ; Petre, R. ; Swank, J. H. ; [et al.]

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Publication Date: 2011-08-24

Description: Recent ROSAT Position Sensitive Proportional Counter (PSPC) observations for the first time unequivocally reveal the presence of a compact source of hard X-ray emission centered on the peculiar star eta Car. These observations also show a dramatic change in the hard-band (E greater than 1.6 keV) counting rate by about a factor of 2 in a 4 month interval. Thus, strong variability, which is a characteristic of eta Car in radio through IR and visible-band wavelengths, is also observed at X-ray energies. The increase in hard X-ray emission could be the result of a tripling of the mass-loss rate in less than 4 months.

Keywords: ASTRONOMY

Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 445; 2; p. L21-L24

Format: text

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