Computer Science
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984iue..prop.1770b&link_type=abstract
IUE Proposal ID #HSGDB
Computer Science
Scientific paper
Magnetically-controlled stellar winds have recently been discovered on several helium-strong stars, thereby expanding the known mass loss domain of the upper main sequence. Observations of helium-strong stars having different rotational periods reveal a complex interplay of magnetic, radiative and rotational forces in determining the character of the winds. The helium weak stars are somewhat cooler than the helium-strong stars and have recently been found to possess strong magnetic fields; one has been found to possess a rotationally modulated stellar wind. We propose to continue our investigation of magnetically controlled mass loss in helium-weak stars by observing UV resonance wind features. Comparison of magnetic and nonmagnetic, rapidly and slowly-rotating candidates in a range of temperatures will elucidate the relative importance of magnetic, radiative, and rotational forces. In parallel, and using the same IUE observations, measurement of UV photospheric diagnostic features will make it possible to disentangle the contributions of temperature, abundance, and electron density inhomogenity in producing the observed spectrum and photometric variations.
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