The detection of H2 in cool carbon stars

Details The detection of H2 in cool carbon stars The detection of H2 in cool carbon stars

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270l..63j&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 270, July 15, 1983, p. L63-L67.

Astronomy and Astrophysics

Astrophysics

29

Carbon Stars, Hydrogen, Late Stars, Stellar Atmospheres, Stellar Spectra, Irregular Variable Stars, Line Spectra, Spectrum Analysis

Scientific paper

Spectra of several carbon stars in the two micron region are examined and compared with synthetic spectra from model atmospheres. Molecular hydrogen has been directly observed in carbon stars for the first time through the quadrupole 1-0 S(1) line at 4712.9/cm. It is definitely present in several Mira variables, and is definitely not present in several irregular variables and one Mira variable. A discrepancy between the predicted and observed line depths at different temperatures is shown. Resolution of the discrepancy by change of temperature alone would require an upward revision of the present effective temperature scale by at least 600 K. Several possible resolutions of the dilemma are briefly examined.

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