A Change in the Physical State of $η$ Carinae?

Details A Change in the Physical State of $η$ Carinae? A Change in the Physical State of $η$ Carinae?

2004-10-28

arxiv.org/abs/astro-ph/0410718v1

Astron.J. 129 (2005) 900

Astronomy and Astrophysics

Astrophysics

Accepted to appear in the Feb 2005 AJ; 22 pages, including 4 figures and 2 tables

Scientific paper

10.1086/427132

During $\eta$ Car's spectroscopic event in mid-2003, the stellar wind's bright H$\alpha$ and H$\beta$ emission lines temporarily had a distinctive shape unlike that reported on any previous occasion, and particularly unlike the 1997--98 event. Evidently the structure of the wind changed between 1997 and 2003. Combining this with other evidence, we suspect that the star may now be passing through a rapid stage in its recovery from the Great Eruption seen 160 years ago. In any case the data indicate that successive spectroscopic events differ, and the hydrogen line profiles are quantitative clues to the abnormal structure of the wind during a spectroscopic event.

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