Physics
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop10821d&link_type=abstract
HST Proposal ID #10821. Cycle 15
Physics
Scientific paper
In 1996, we reported the discovery of a bright variable star in the giant extragalactic HII region NGC 2363. Subsequent photometry and high quality HST/STIS spectroscopy of this star, NGC 2363-V1, revealed that we are witnessing a significant event in the evolution of a massive star, namely a major eruption of a Luminous Blue Variable LBV, similar to that of Eta Carina in the 19th century. We have monitored spectroscopically NGC 2363-V1 with HST from 1997 until the failure of STIS in August 2004. A quantitative analysis of the STIS datasets gathered during this period allowed us to determine some important properties of the star and their evolution during the course of the eruption: luminosity, mass loss rate, wind terminal velocity, surface temperature and even Fe content of this erupting LBV. It is clear from our analysis that NGC 2363-V1 is slowly coming back to the blue side of the H-R diagram: its surface temperature rose from 11000K in 1997 to 21000K in 2004. Because such events are rare, continuous monitoring of the physical parameters of NGC 2363-V1 over the course of its present eruption will provide an invaluable set of constraints for theoretical models. We continue to monitor the variations in the visible range with HIRES on Keck, and we therefore propose here to obtain crucial information on the shape of the ultraviolet part of the spectrum with low resolution spectra of this star in the ultraviolet with ACS.
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