Other
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aj.....87.1223j&link_type=abstract
Astronomical Journal, vol. 87, Aug. 1982, p. 1223-1232.
Other
82
Astrometry, Herbig-Haro Objects, Absorption Spectra, Radial Velocity, Stellar Motions
Scientific paper
Measurements of the motion of the Herbig-Haro Object HH-39 show that the four brighter knots of HH-39 are in motion away from R Mon and NGC 2261, with one knot having a tangential velocity of 60 km/sec while the others are grouped around a mean of 290 km/sec. A model is proposed in which dust from a circumstellar disk or torus is expelled by wind pressure from R Mon and is driven northward along the hollow cone of NGC 2261 at about 30 km/sec, and the increasingly negative shift of the absorption spectrum with distance from R Mon is interpreted in terms of a wind (or shell) having a latitude-dependent expansion velocity. At polar latitudes, the hollowness of the nebular cone allows the wind to escape at maximum velocity, and in that latitude limit the shell radial velocities connect with the tangential velocity measured for HH-39.
Herbig George H.
Jones Burton F.
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