Detection of J = 5-4 SiO masers in late-type stars

Details Detection of J = 5-4 SiO masers in late-type stars Detection of J = 5-4 SiO masers in late-type stars

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...266l.117c&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 266, Mar. 15, 1983, p. L117-L121.

Astronomy and Astrophysics

Astrophysics

15

Late Stars, Masers, Silicon Oxides, Stellar Envelopes, Stellar Radiation, Variable Stars, Emission Spectra, Giant Stars, Line Spectra, Luminosity, Supergiant Stars

Scientific paper

Detections of v = 1 and v = 2 maser emission from the J = 5-4 transition of SiO toward several late-type stars are reported. The v = 1, J = 5-4 emission is strong and exhibits photon luminosities comparable to those in the J = 1-0, 2-2, 3-2, and 4-3 transitions. The v = 2, J = 5-4 line appears to be somewhat weaker than the v = 1 line. The velocity extent of emission in J = 5-4 shows the narrow and wide differentiation which separates giant from supergiant stars for the lower J maser lines. Detailed models of pump mechanisms predicting strong masers in high rotational transitions have not yet been developed, and maser models presented to data are at odds with recent observations.

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