Proto-planetary nebulae. I - The extreme bipolar nebulae M2-9 and M1-91

Details Proto-planetary nebulae. I - The extreme bipolar nebulae M2-9 and M1-91 Proto-planetary nebulae. I - The extreme bipolar nebulae M2-9 and M1-91

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...366..163g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 366, Jan. 1, 1991, p. 163-171.

Physics

Optics

27

Astronomical Spectroscopy, Planetary Nebulae, Protoplanets, Accretion Disks, Binary Stars, Cassegrain Optics, Ionized Gases, Stellar Orbits

Scientific paper

Results are presented on a long-slit optical spectroscopy measurements of the prototype bipolar planetary nebula M2-9 and the M1-91 bipolar nebula, performed in order to determine the nature of the morphology of the wings of these two nebulae. It is concluded that the overall bipolar morphologies of these nebulae might be due to the orbital motions of binaries, with the orbital angular momentum vector defining the axis of the nebula. Secondary symmetries in the nebulae, such as the point-symmetric knots in M1-91, could be due to other symmetries, such as the rotation axis of one of the individual stars or the polar axis of the accretion disk.

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