Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008asthe.101..143k&link_type=abstract
The Astronomical Herald (ISSN 0374-2466), Vol. 101, No. 3, p. 143 - 151 (2008)
Astronomy and Astrophysics
Astronomy
Emission-Line Stars, Planetary Nebulae
Scientific paper
O-type stars are hot massive stars having strong radiatively-driven winds. Recent studies of stellar winds taking into account the clumpy structure revised the mass-loss rate downward by a factor of several. Stellar magnetic fields have been detected for some O stars, suggesting the fossil origin of neutron star magnetic fields through evolution of O stars as their progenitors. Optical and X-ray observations of Of? type stars reveal some enigmatic behaviours in the effects of stellar rotation and magnetic field for their structure of winds. Central stars of planetary nebulae, when classified as [WR], weak emission-line, and no emission-line stars, seem to have different evolutionary paths from post-AGB to white dwarf stars. The formation of asymmetric planetary nebulae is also a subject of debate whether they formed by stellar magnetism or from close binary system. These problems are briefly reviewed.
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