High-excitation SiO masers in evolved stars

Details High-excitation SiO masers in evolved stars High-excitation SiO masers in evolved stars

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...323..749j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 323, Dec. 15, 1987, p. 749-755. Research supported by the Research Corp.

Astronomy and Astrophysics

Astrophysics

35

Interstellar Masers, Silicon Oxides, Stellar Evolution, Stellar Rotation, Atomic Excitations, Emission Spectra, Stellar Envelopes, Tables (Data)

Scientific paper

The authors report the detection of SiO maser lines from highly excited rotational states, including the υ = 1, J = 6 - 5 transition in R Leo - the highest rotational transition detected to date. Maser emission from the υ = 1, J = 5 - 4 transition appears to be fairly common in evolved stars, with detectability mainly determined by telescope sensitivity. VX Sgr and possibly VY CMa show υ = 2, J = 5 - 4 emission and υ = 3, J = 5 - 4 emission may be present in VX Sgr. The observations of this study do not support theories advocating a cascade of photons down the entire SiO rotational ladder.

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