Other
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..332..164s&link_type=abstract
The Fate of the Most Massive Stars, ASP Conference Series, Vol. 332, Proceedings of the conference held 23-28 May, 2004 in Grand
Other
1
Scientific paper
Asymmetric variability in UV images of the Homunculus obtained with the ACS/HRC on HST suggests that η Car is indeed a binary system. Images obtained before, during, and after the recent ``spectroscopic event'' in 2003.5 show alternating patterns of bright spots and shadows on opposite sides of the star before and after the event, providing a strong geometric argument for an azimuthally-evolving, asymmetric UV radiation field as one might predict in some binary models. The simplest interpretation of these UV images, where excess UV escapes from the secondary star in the direction away from the primary, places the major axis of the eccentric orbit roughly perpendicular to our line of sight, sharing the same equatorial plane as the Homunculus. Other orbital orientations may be allowed with more complicated assumptions. The brightness asymmetries cannot be explained with delays due to light travel time alone, so a single-star model would require a seriously asymmetric shell ejection.
Collins Nathan
Gull Ted R.
Morse Jon A.
Smith Nathan
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