Internal motions in H II regions. V - The planetary nebula M1-67, possibly an H II region

Details Internal motions in H II regions. V - The planetary nebula M1-67, possibly an H II region Internal motions in H II regions. V - The planetary nebula M1-67, possibly an H II region

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979rmxaa...4..271p&link_type=abstract

Revista Mexicana de Astronomia y Astrofisica, vol. 4, Jan. 1979, p. 271-277.

Astronomy and Astrophysics

Astronomy

15

H Ii Regions, Planetary Nebulae, Radial Velocity, Stellar Mass Ejection, Fabry-Perot Interferometers, Stellar Evolution, Stellar Structure

Scientific paper

Fabry-Perot interferometry was used to obtain the radial velocity field of M1-67, classified earlier as a planetary. The standard deviations of the velocities are in the range 40-70 km/s. With respect to the central star, the northern edge has excess negative velocity and the southern edge, excess positive velocity. This and the bi-symmetry of the structure suggest that the nebula is formed essentially by non-isotropic mass ejection from the central star by a mechanism proposed earlier for NGC 6164-5 and NGC 2359. The age of the nebula is estimated as 5800 years. Arguments are presented to conclude that M1-67 should be considered an H II region rather than a classical planetary nebula.

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