Multiple collimated outflows in the planetary nebula IC 4593?
نویسندگان
چکیده
منابع مشابه
Precessing Collimated Outflows in the Planetary Nebula Ic 4846
We present [N ii] and Hα images and high resolution long–slit spectra of the planetary nebula IC4846, which reveal, for the first time, its complex structure and the existence of collimated outflows. The object consists of a moderately elongated shell, two (and probably three) pairs of collimated bipolar outflows at different orientations, and an attached circular shell. One of the collimated p...
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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 کاملKinematics of the strange knots and halo of the planetary nebula IC 4593
Kinematical observations have been made with the Manchester Echelle Spectrometer combined with the San Pedro Mártir telescope of the various features of the strange planetary nebula IC 4593. In particular the outer knots are shown to be inert and extended high-speed flows are found to be emerging from the nebular core. Various models for the whole structure are discussed in the face of these ne...
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We have discovered multiple jet-like features in the inner regions of the protoplanetary nebula (PPN) Frosty Leo, in optical images obtained with the Hubble Space Telescope. Frosty Leo is only the second PPN (after CRL2688) and the first oxygen-rich one, to show well-focussed jets close to the equatorial plane. The nebula consists of two bright compact structures embedded inside two large tenuo...
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 ...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1997
ISSN: 0074-1809
DOI: 10.1017/s0074180900130372