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Title:
Interferometric observations of SiO V = 0 thermal emission from evolved stars
Authors:
Lucas, R.; Bujarrabal, V.; Guilloteau, S.; Bachiller, R.; Baudry, A.; Cernicharo, J.; Delannoy, J.; Forveille, T.; Guelin, M.; Radford, S. J. E.
Affiliation:
AA(Inst. de Radioastronomie Millimetrique, Saint-Martin-d'Heres, France), AB(Centro Astronomico de Yebes, Guadalajara, Spain), AC(Inst. de Radioastronomie Millimetrique, Saint-Martin-d'Heres, France), AD(Centro Astronomico de Yebes, Guadalajara, Spain), AE(Bordeaux, Observatoire, Floriac, France), AF(Centro Astronomico de Yebes, Guadalajara, Spain), AG(Inst. de Radioastronomie Millimetrique, Saint-Martin-d'Heres, France), AH(Grenoble, Observatoire, France), AI(Inst. de Radioastronomie Millimetrique, Saint-Martin-d'Heres, France), AJ(Inst. de Radioastronomie Millimetrique, Saint-Martin-d'Heres, France)
Publication:
Astronomy and Astrophysics (ISSN 0004-6361), vol. 262, no. 2, p. 491-500. (A&A Homepage)
Publication Date:
09/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL INTERFEROMETRY, MOLECULAR SPECTRA, SILICON OXIDES, STELLAR EVOLUTION, THERMAL EMISSION, VARIABLE STARS, LINE SPECTRA, RADIO ASTRONOMY, STELLAR MASS
Bibliographic Code:
1992A&A...262..491L

Abstract

Interferometric observations of the SiO v = 0 J = 2-1 emission from the O-rich evolved stars RX Boo, VY CMa, R Cas, Omicron Cet, NML Cyg, W Hya, R Leo, IK Tau, IRC + 10011, and IRC + 10420, the carbon star IRC + 10216, and the S-type star Chi Cyg are reported. Except for IRC + 10216, the source diameters do not vary with radial velocity; this behavior is not expected for envelopes expanding with an almost constant velocity, which would have a clear maximum at the central velocities, and shows that the terminal velocity is not yet attained at distances of the order of 5 x 10 exp 15 from the star. It is suggested that such a phenomenon is due to grain formation extending over a region comparable to the SiO emitting shell, which is much larger than previously believed.

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