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Detection of Water Maser Emission from a Carbon Star V778 Cygni

Published online by Cambridge University Press:  12 April 2016

Y. Nakada ,
H. Izumiura ,
T. Onaka ,
O. Hashimoto ,
N. Ukita ,
S. Deguchi  and
T. Tanabé
Y. Nakada
Affiliation:
Department of Astronomy, Faculty of Science, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan
H. Izumiura
Affiliation:
Department of Astronomy, Faculty of Science, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan
T. Onaka
Affiliation:
Department of Astronomy, Faculty of Science, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan
O. Hashimoto
Affiliation:
Department of Astronomy, Faculty of Science, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan
N. Ukita
Affiliation:
Nobeyama Radio Observatory, Tokyo Astronomical Observatory, University of Tokyo, Nagano 384-13, Japan
S. Deguchi
Affiliation:
Nobeyama Radio Observatory, Tokyo Astronomical Observatory, University of Tokyo, Nagano 384-13, Japan
T. Tanabé
Affiliation:
Tokyo Astronomical Observatory, University of Tokyo Mitaka, Tokyo 181, Japan

Extract

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Infrared spectra of evolved stars are generally dominated by the radiation from their circumstellar shells. M stars are characterized by the 10 μm emission feature from silicate dust grains, while C stars by the 11 μm SiC band. However, some C stars have been found to show the 10 μm feature indicating the oxygen-rich property of their circumstellar dust (Willems and de Jong 1986, Little-Marenin 1986).

In order to investigate the gas phase chemistry of the circumstellar envelopes around these peculiar objects, we have observed radio molecular lines of H2O, SiO, HCN, and CO towards three of them BM Gem (C5, 4J), V778 Cyg (C4, 5J), and EU And (C4, 4).

Type
Part I. Chemical Peculiarities as Probe of Stellar Evolution
Information
International Astronomical Union Colloquium , Volume 108: Atmospherics Diagnostics of Stellar Evolution: Chemical Peculiarity, Mass Loss, and Explosion , 1988 , pp. 53 - 54
Copyright
Copyright © Springer-Verlag 1988

References

Benson, R.J., and Little-Marenin, I.R. 1987, Ap. J. (Letters), 316, L37.Google Scholar
Deguchi, S. et al. 1987, Ap. J., in press.Google Scholar
Little-Marenin, I.R. 1986, Ap. J. (Letters), 307, L15.CrossRefGoogle Scholar
Willems, F.J., and de Jong, T.J. 1986, Ap. J. (Letters), 309, L39.CrossRefGoogle Scholar