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  • 1
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    CO observations of the expanding envelope of IRC plus 10216 (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: High-sensitivity emission profiles were observed for the transition of C12O16 and C13O16 towards IRC + or - 10216. It appears that the spherically symmetric uniform mass-outflow model proposed by Morris is necessary to describe the line profiles. The outflow appears to be slightly accelerated, having a velocity of 15 km/sec at the edges of the CO cloud, compared with 12 km/sec for the more centrally confined molecules.
    Keywords: ASTRONOMY
    Type: NASA-CR-119157 , AD-A011098 , REPT-1975-8
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    CO observations of galactic reflection nebulae (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Carbon monoxide emission has been observed toward about 35 galactic reflection nebulae. The peaking of CO temperatures near the hotter stars indicates substantial local heating of the gas and dust by the embedded stars. Wide low-level emission wings are seen on several of the (C-12)O line profiles; these are most plausibly interpreted as due to cloud material accelerated by such processes as radiation pressure from the newborn stars.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 214
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    CO observations of NGC 1579 /S222/ and S239 (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The 2.6-mm lines of (C-12)O and (C-13)O have been observed toward the small galactic diffuse nebulae NGC 1579 (S222) and S239. The H92-alpha recombination line has also been detected from NGC 1579. Toward NGC 1579, evidence was observed for self-absorption in the (C-12)O line. For both regions, high-velocity wings and line broadening are observable in the (C-12)O line; the features observed toward S239 suggest ordered free-fall collapse of a localized region of the cloud onto a newborn stellar cluster. Examination of the available data suggests that NGC 1579 is both a reflection nebula (illuminated by LKH-alpha 101) and an obscured H II region excited by a star of spectral type near B1, while S239 is a reflection nebula or a Herbig-Haro object. The present studies of these regions show that line widening in CO is at least as important an indicator of star-formation activity as enhanced line emission.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; 206; June 1
    Format: text
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    NASA TECHNICAL REPORTS
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