Other
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12179b&link_type=abstract
HST Proposal ID #12179. Cycle 18
Other
Scientific paper
Magnetic fields have recently been discovered on several massive stars, but their origin and influence on the evolution of these stars are poorly understood. Two of these objects, HD 191612 and HD 108, are of particular interest. Very recent spectropolarimetric observations have shown that they are most likely magnetic oblique rotators, like the young O star Theta1 Ori C, whose 15d periodically variable field was found somewhat earlier. However, the two new objects are much slower rotators, unusually so for O stars, with periods of 538d and 50-60yrs, respectively, and there are other indications that they are older. They provide an opportunity to study the efficiency of wind braking of magnetic O stars through angular momentum loss. We shall perform STIS high-resolution UV spectroscopy of HD 191612 and HD 108 {phase resolved for the former} to derive more complete estimates of fundamental quantities than available from optical data alone. We shall measure the mass-loss rates from the UV wind profiles, which will constrain the extreme wind confinement of these stars and establish whether the large H-alpha emission variations are wind-related or geometrical. We shall also derive more accurate ages and stellar surface properties. In turn, these results will support a more definitive discussion of the angular momentum evolution versus the ages of HD 191612 and HD 108, and of the comparison with the younger and faster Theta1 Ori C.;
No associations
LandOfFree
The Stellar Winds of Evolved, Braked O-Type Magnetic Oblique Rotators does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Stellar Winds of Evolved, Braked O-Type Magnetic Oblique Rotators, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Stellar Winds of Evolved, Braked O-Type Magnetic Oblique Rotators will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1785937