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Far-Infrared Hydrogen Lasers in the Peculiar Star MWC 349AFar-infrared hydrogen recombination lines H15(alpha)(169.4 micrometers), H12(alpha)(88.8 micrometers), and H10(alpha)(52.5 micrometers) were detected in the peculiar luminous star MWC 349A from the Kuiper Airborne Observatory. Here it is shown that at least H15(alpha) is strongly amplified, with the probable amplification factor being greater than or about equal to 10(exp 3) and a brightness temperature that is greater than or about equal to 10(exp 7) kelvin. The other two lines also show signs of amplification, although to a lesser degree. Beyond H10(alpha) the amplification apparently vanishes. The newly detected amplified lines fall into the laser wavelength domain. These lasers, as well as the previously detected hydrogen masers may originate in the photoionized circumstellar disk of MWC 349A and constrain the disk's physics and structure.
Document ID
19980017617
Document Type
Contractor Report (CR)
Authors
Strelnitski, Vladimir (National Air and Space Museum Washington, DC United States)
Haas, Michael R. (NASA Ames Research Center Moffett Field, CA United States)
Smith, Howard A. (National Air and Space Museum Washington, DC United States)
Erickson, Edwin F. (NASA Ames Research Center Moffett Field, CA United States)
Colgan, Sean W. J. (NASA Ames Research Center Moffett Field, CA United States)
Hollenbach, David J. (NASA Ames Research Center Moffett Field, CA United States)
Date Acquired
September 6, 2013
Publication Date
June 7, 1996
Publication Information
Publication: Science
Volume: 272
Subject Category
Astrophysics
Report/Patent Number
NASA/CR-96-207127
NAS 1.26:207127
Funding Number(s)
CONTRACT_GRANT: NAG2-1010
Distribution Limits
Public
Copyright
Public Use Permitted.

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