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Silicon monoxide in the 4 micron infrared spectrum of long-period variablesThe first-overtone sequence of vibration-rotation transitions of the free radical silicon monoxide are shown to have extreme phase-dependent variations in the spectra of two M-type long-period variables, Omicron Ceti and R Leonis, and the mild S-type long-period variable, Chi Cygni. At maximum light, the SiO band heads are not detectable. Near minimum light, the band heads of (Si-25)O are detected in the 4-micron spectra of all three stars. The band heads of the terrestrially less abundant isotopic species, (Si-29)O and (Si-30)O, are detected in Chi Cygni. Possible explanations of the phase-dependent behavior are discussed, and the role of the stellar chromosphere is considered.
Document ID
19770034469
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Hinkle, K. H.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Barnes, T. G.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Lambert, D. L.
(McDonald Observatory; Texas, University Austin, Tex., United States)
Beer, R.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena Calif., United States)
Date Acquired
August 9, 2013
Publication Date
December 15, 1976
Publication Information
Publication: Astrophysical Journal
Volume: 210
Subject Category
Astrophysics
Accession Number
77A17321
Funding Number(s)
CONTRACT_GRANT: NAS7-100
CONTRACT_GRANT: NSF AST-75-21803
Distribution Limits
Public
Copyright
Other

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