view Abstract Citations (133) References (49) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A survey of high-velocity molecular gas near Herbig-Haro objects. II. Edwards, S. ; Snell, R. L. Abstract A previous search for high-velocity molecular gas in the vicinity of Herbig-Haro objects is extended. New observations at the (C-12)O J = 1-0 transition obtained with the 14 m telescope of the Five College Radio Astronomy Observatory reveal four sites of spatially limited supersonic molecular gas which are tentatively identified as additional energetic outflows in the vicinity of Herbig-Haro objects. One is in the NGC 1999 region, two are in the neighborhood of RNO 43, and one is coincident with the newly discovered H2O maser in NGC 2068. A summary of 17 energetic molecular outflows in the vicinity of Herbig-Haro objects is presented, and the association between optically emitting shocks and large-scale expanding gas is discussed. The previous estimate that at least all stars as massive as 1 solar mass undergo a phase of mass loss of not less than about 10 to the -7th solar mass/yr for a period of about 10,000 yr is upheld by the new observations. Publication: The Astrophysical Journal Pub Date: June 1984 DOI: 10.1086/162093 Bibcode: 1984ApJ...281..237E Keywords: Herbig-Haro Objects; Interstellar Gas; Molecular Gases; Stellar Mass Ejection; Carbon Monoxide; Infrared Spectra; Water Masers; Astrophysics full text sources ADS | data products SIMBAD (64) Related Materials (1) Part 1: 1983ApJ...270..605E
view Abstract Citations (132) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS High velocity molecular gas near Herbig-Haro objects HH 7-11. Snell, R. L. ; Edwards, S. Abstract The presence of high-velocity molecular gas associated with a low-luminosity IR source in the vicinity of the Herbig-Haro objects HH 7-11 is revealed by observations of the J=2-1 and J=1-0 transitions of (C-12)O and (C-13)O. Peak intensities spatially separated by 1.5 arcmin are shown by the blueshifted and redshifted wings, suggesting an energetic bipolar outflow of gas from a young, low-mass star. These observations imply a mass loss rate of eight million solar masses per year. Publication: The Astrophysical Journal Pub Date: December 1981 DOI: 10.1086/159443 Bibcode: 1981ApJ...251..103S Keywords: Carbon Monoxide; Herbig-Haro Objects; Infrared Radiation; Interstellar Gas; Molecular Spectra; Stellar Mass Ejection; Emission Spectra; Main Sequence Stars; Molecular Gases; Red Shift; Astronomy full text sources ADS | data products SIMBAD (5)
view Abstract Citations (145) References (70) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A survey of high-velocity molecular gas in the vicinity of Herbig-Haro objects. I. Edwards, S. ; Snell, R. L. Abstract A survey of high-velocity molecular gas toward 49 Herbig-Haro objects is presented. Observations of the (C-12)O J = 1-0 transition obtained with the 14 m telescope of the Five College Radio Astronomy Observatory reveal three new spatially extended high-velocity molecular outflows. One is in the NGC 1333 region near HH 12, and two are in the NGC 7129 region, the first near LkH-alpha 234 and the second near a far-infrared source. The relationship between optical Herbig-Haro emission knots and large-scale motions of the ambient molecular material is investigated, and the properties of high-velocity molecular outflows in the vicinity of Herbig-Haro objects are discussed. Of 11 energetic outflows in the vicinity of Herbig-Haro objects, eight are found in four pairs separated by 0.2-1.0 pc. It is estimated that energetic outflows characterized by mass loss rates equal to or greater than 10 to the -7th solar masses per yr occur for at least 10,000 yr once in the lifetime of all stars with masses greater than 1 solar mass. Publication: The Astrophysical Journal Pub Date: July 1983 DOI: 10.1086/161152 Bibcode: 1983ApJ...270..605E Keywords: Herbig-Haro Objects; Molecular Gases; Stellar Winds; Far Infrared Radiation; Flow Velocity; H Alpha Line; Main Sequence Stars; Nebulae; Stellar Mass Ejection; Astrophysics full text sources ADS | data products SIMBAD (59) Related Materials (1) Part 2: 1984ApJ...281..237E
view Abstract Citations (59) References (31) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Observations of high-velocity molecular gas near Herbig-Haro objects : HH 24 -27 and HH 1 -2. Snell, R. L. ; Edwards, S. Abstract High-velocity CO has been detected in the vicinity of the Herbig-Haro objects HH 24-27. These observations indicate that there are two sources of high-velocity outflow; one centered on an infrared source near HH 26, and the second centered roughly 2 arcmin south of HH 24. The redshifted and blueshifted wings in both sources are spatially separated suggesting that the high-velocity gas is due to energetic bipolar outflows from young stars embedded in the molecular cloud. The association of Herbig-Haro objects with regions of high-velocity gas suggests a common origin for both in the interaction of a stellar wind with the ambient molecular cloud. The mass loss rates implied by our observations, assuming that the rate of mass loss has been constant throughout the dynamical lifetime of the bipolar lobes, are roughly 10 to the -6th solar mass per year for both sources. Publication: The Astrophysical Journal Pub Date: August 1982 DOI: 10.1086/160203 Bibcode: 1982ApJ...259..668S Keywords: Herbig-Haro Objects; Interstellar Gas; Molecular Clouds; Stellar Mass Ejection; Stellar Spectra; Stellar Winds; Astronomical Maps; Carbon Monoxide; Early Stars; Infrared Astronomy; Plasma Interactions; Red Shift; Astrophysics full text sources ADS | data products SIMBAD (13)
