Unanticipated Mid-Cycle Changes in Eta Carinae

Details Unanticipated Mid-Cycle Changes in Eta Carinae Unanticipated Mid-Cycle Changes in Eta Carinae

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21442804h&link_type=abstract

American Astronomical Society, AAS Meeting #214, #428.04; Bulletin of the American Astronomical Society, Vol. 41, p.698

Astronomy and Astrophysics

Astronomy

Scientific paper

In the last half of 2006 and early 2007, eta Car unexpectedly faded after steadily increasing brightness for a decade. The fading occurred halfway between predicted "spectroscopic events" when eta Car was well-separated from the proposed secondary star. Photometry from
HST/WFPC2 shows that the change in brightness occurred in the central star and not in the nebula. The fading was a uniform decrease in continuum brightness, but was not as dramatic in the near-UV. Spectra during and after the decline, from GMOS on Gemini-South and VLT/UVES, reveal subtle changes in the line profiles including the appearance of a P Cyg profile in Halpha which support a change in the latitude-dependent wind
of the massive primary as the origin of this mid-cycle activity.

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