Carbon Monoxide observations of R Monocerotis, NGC 2261, and Herbig-Haro 39: The interstellar nozzle

Journal Article · Sun Feb 15 04:00:00 EST 1981 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/158689· OSTI ID:6294561

Canto, J; Rodriguez, L F; Barral, J F; Carral, P

R Mon is a peculiar star located at the apex of the (apparent) cometary nebula NGC 2261. Carbon monoxide observations of this region show an elongated (approx.4' x 2' or approx.0.8 x 0.4 pc) molecular cloud at whose center lies R Mon. The interpretation of the observations suggests that the cloud is disk shaped and that the stellar wind of R Mon has created a bipolar cavity in it. In the visible, the northern cavity (NGC 2261) shines by reflecting the light of R Mon. The southern cavity is obscured in the visible by the titled molecular disk but can be detected in the CO observations. We found a blueshifted CO component related to the northern lobe (NGC 2261) and a redshifted CO component related to the obscured southern lobe. Thus, NGC 2261 is not a cometary nebula but one of the lobes of a bipolar nebula. The wind of R Mon is being channeled by the cavities into two antiparallel annular streams. An appreciable fraction of the mechanical energy of the wind is carried out in the streams. At approx.7'(approx.1.4 pc) to the north of R Mon the northern stream encounters another small molecular cloud. In this interaction the stream is deflected and shocks against itself. Upon cooling it radiates as HH 39.

• Research Organization: Instituto de Astronomia, Universidad Nacional Autonoma de Mexico
• OSTI ID: 6294561
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 244:1; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
ELECTROMAGNETIC RADIATION
ENERGY SPECTRA
FLUID MECHANICS
HYDRODYNAMICS
MECHANICS
NEBULAE
NOZZLES
OXIDES
OXYGEN COMPOUNDS
RADIATIONS
RADIOWAVE RADIATION
SPECTRA
STARS
STELLAR WINDS