Multi-wavelength Investigation of the Super-massive star η Carinae

Details Multi-wavelength Investigation of the Super-massive star η Carinae Multi-wavelength Investigation of the Super-massive star η Carinae

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.2507i&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #25.07; Bulletin of the American Astronomical Society, Vol. 31, p.1410

Astronomy and Astrophysics

Astronomy

Scientific paper

The super-massive star η Carinae exhibits periodic variations of 85-day in hard X-rays and 2020-day throughout its EM spectrum. Although a number of qualitative hypotheses have been made to suggest the nature of the periodic phenomena, the truth has not yet been identified. Recent debates on the nature of η Carinae's periodicities focus on two types of models: a single, unstable star versus a massive binary system. The main theme of my dissertation addresses quantitatively whether a certain type of a binary hypothesis agrees with the observed changes monitored with RXTE/PCA and HST/STIS observations of η Carinae before and after the last dramatic spectroscopic variations occurred at the year 1998.0. The analyses suggest that a binary hypothesis can indeed be fit to explain the periodic variations, while numerous problems with the current binary orbital parameters exist. Therefore, this dissertation does not constitute a proof to a binary hypothesis; there may be a remote possibility that the hypothesis could even be wrong. Further quantitative analysis will be given to illustrate the general problems with a binary hypothesis in order to provide a sense of direction to which future research on η Carinae should lead. This research was supported by NASA grant NAS5-32490 and GO-7402 from the Space Telescope Science Institute.

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