Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9094k&link_type=abstract
HST Proposal ID #9094
Computer Science
Hst Proposal Id #9094 Hot Stars
Scientific paper
HD 5980 is the visually brightest object in the SMC. It contains a close eclipsing binary LBV+WR {=Star A+Star B}, the only one known to exist, with the possible exception of Eta Carinae. The LBV underwent a great eruption in 1994, ejecting <10^-3 M_odot at velocities in the range of 200-800 km s^-1. After the eruption, its wind velocity has been steadily increasing, and producing a circumstellar {CSM} fast- wind/slow-wind interaction region, which has now become visible spectroscopically in the C IV and Si IV lines at an expansion velocity of -680 km s^-1. These narrow features varied over a 1 year timescale. It is likely that HD 5980 is forming an H II region analogous to the Homunculus in Eta Carinae. In addition, the wind-wind collision shocked region between the two stars currently {1999-2000} forms a shock cone that winds tightly around the WR star. The purpose of this proposal is to: a} Determine the LBV's wind velocity close to the time when it will be observed with XMM and CHANDRA; b} follow the changes in the high velocity CSM absorption features; and c} Constrain the radial velocity variability of the third component, Star C, in order to determine whether it is bound to the A+B pair. The three objectives can be achieved with just two visits, using STIS to obtain the FUV+NUV spectrum. HST is the only observatory capable of providing these data. A reduced 3 month proprietary period is proposed.
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