LBV (candidate) nebulae: bipolarity and outflows
نویسندگان
چکیده
منابع مشابه
Collimated Outflows in Planetary Nebulae
Our understanding of the formation of planetary nebulae (PNe) has been profoundly influenced in recent years by the detection of high-velocity, collimated outflows in these objects. Outflows reaching expansion velocities of several hundred km s and evidences of episodic, multiple ejection events since the proto-PNe stage, have radically modified our previous concepts of the evolution of post-AG...
متن کاملThe shape of η Carinae and LBV Nebulae
Stellar winds emitted by rotating massive stars may show two main components: firstly bipolar lobes with low density and fast wind, produced by the higher T eff and gravity at the poles (" g eff –effect "); secondly, an equatorial disc with a slow dense wind, produced by the stronger opacities at the equator (" κ–effect "). To see the possible role of this anisotropic wind on the shape of LBV n...
متن کاملWinds, Bubbles, and Outflows in Planetary Nebulae
The aim of this work is to highlight the contributions that John Dyson has made to the study of the interstellar medium in general and, in particular, to the field of planetary nebulae. I review a few outstanding problems regarding the formation and evolution of outflows in planetary nebulae.
متن کاملWolf-Rayet and LBV Nebulae as the Result of Variable and Non-Spherical Stellar Winds
The physical basis for interpreting observations of nebular morphology around massive stars in terms of the evolution of the central stars is reviewed, and examples are discussed, including NGC 6888, OMC-1, and η Carinae.
متن کاملHow Fast Are Collimated Outflows in Planetary Nebulae?
A significant fraction of planetary nebulae (PNe) show jet-like features. These features are usually interpreted as fast collimated outflows, although their true space velocities are uncertain, as their measured radial velocities cannot be properly corrected for projection effects. We have compiled the measured expansion velocities and radial distances of collimated outflows for a sample of 33 ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 2003
ISSN: 0074-1809
DOI: 10.1017/s0074180900213387