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Circumstellar envelope structure of late-type stars

BOWERS, P. F ; JOHNSTON, K. J ; SPENCER, J. H

The Astrophysical journal, 1983-11, Vol.274 (2), p.733-754 [Periódico revisado por pares]

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Título:
Circumstellar envelope structure of late-type stars
Autor: BOWERS, P. F ; JOHNSTON, K. J ; SPENCER, J. H
Assuntos: Astronomy ; Earth, ocean, space ; Exact sciences and technology ; Long-period variables (miras) and semiregulars ; Stars ; Variable and peculiar stars (including novae)
É parte de: The Astrophysical journal, 1983-11, Vol.274 (2), p.733-754
Notas: ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
Descrição: Various molecular species (OH, H2O, SiO, CO) can be found in the extensive envelopes of late-type, oxygen-rich Mira variables and supergiant stars. The OH maser at 1612 MHz is particularly useful to ascertain properties of the outer envelope. Bowers et al. (1981) have obtained evidence directly supporting an expanding spherical shell model regarding the envelope structure, taking into account initial results of VLA observations at 1612 MHz for 20 OH/IR stars. Four of these stars have been discussed by Spencer et al. (1983), while Bowers (1983) considered the peculiar supergiant star IRC +10420. In the present investigation, data for the remaining stars are presented, and the extent and relative positions of individual spectral features at 1612 MHz are compared to current theoretical models. It is suggested that circumstellar geometry and mass are affected by close binary companions.
Editor: Chicago, IL: University of Chicago Press
Idioma: Inglês

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