First detection of x-ray variability of eta carinae

Details First detection of x-ray variability of eta carinae First detection of x-ray variability of eta carinae

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...445l.121c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 445, no. 2, p. L121-L124

Astronomy and Astrophysics

Astronomy

52

Emission Spectra, Peculiar Stars, Stellar Activity, Stellar Envelopes, X Ray Astronomy, X Ray Spectra, X Ray Stars, Infrared Spectra, Radio Spectra, Rosat Mission, Stellar Mass Ejection

Scientific paper

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.

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