Computer Science
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1135..162n&link_type=abstract
FUTURE DIRECTIONS IN ULTRAVIOLET SPECTROSCOPY: A Conference Inspired by the Accomplishments of the Far Ultraviolet Spectroscopic
Computer Science
Photometric, Polarimetric, And Spectroscopic Instrumentation, Interstellar Medium And Nebulae In External Galaxies, Sonoluminescence, Triboluminescence
Scientific paper
Observations in the far-UV provide a unique opportunity to investigate the very massive star η Car and its hot binary companion, η Car B. η Car was observed with FUSE over a large portion of the 5.54 year spectroscopic period before and after the 2003.5 minimum. The observed spectrum is defined by strong stellar wind signatures, primarily from η Car A, complicated by the strong absorptions of the ejecta surrounding η Car plus interstellar absorption. The Homunculus and Little Homunculus are massive bipolar ejecta historically associable with LBV outbursts in the 1840s and the 1890s and are linked to absorptions at -513 and -146 km s-1, respectively. The FUSE spectra are confused by the extended nebulosity and thermal drifting of the FUSE co-pointed instruments. Interpretation is further complicated by two B-stars sufficiently close to η Car to be included most of the time in the large FUSE aperture. Followup observations partially succeeded in obtaining spectra of at least one of these B-stars through the smaller apertures, allowing potential separation of the B-star contributions and η Car. A complete analysis of all available spectra is currently underway. Our ultimate goals are to directly detect the hot secondary star if possible with FUSE and to identify the absorption contributions to the overall spectrum especially of the stellar members and the massive ejecta.
Gull Ted R.
Hillier Desmond John
Iping Rosina
Jensen Adam G.
Nielsen Krister E.
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