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

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.2104c&link_type=abstract

American Astronomical Society, 186th AAS Meeting, #21.04; Bulletin of the American Astronomical Society, Vol. 27, p.838

Astronomy and Astrophysics

Astronomy

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 Carinae. These observations also show a dramatic change in the hard-band (E >= 1.6 keV) counting rate by ~ a factor of 2 in a 4-month interval. ROSAT High Resolution Imager (HRI) observations which span the PSPC observations also reveal a variable source of X-ray emission centered on eta Carinae. Thus strong variability which is a characteristic of eta Carinae 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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