Far-Infrared Hydrogen Lasers in the Peculiar Star MWC 349A

Details Far-Infrared Hydrogen Lasers in the Peculiar Star MWC 349A Far-Infrared Hydrogen Lasers in the Peculiar Star MWC 349A

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996sci...272.1459s&link_type=abstract

Science, vol. 272, p. 1459

Other

30

Amplification, Far Infrared Radiation, Hydrogen Masers, Hydrogen Recombinations, Lasers, Peculiar Stars, Kuiper Airborne Observatory, Photoionization, Stellar Envelopes, Brightness Temperature

Scientific paper

Far-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 103 and a brightness temperature that is greater than or about equal to 107 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.

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