Hostname: page-component-586b7cd67f-vdxz6 Total loading time: 0 Render date: 2024-12-05T02:37:22.507Z Has data issue: false hasContentIssue false
  • English
  • Français

Time Variations of Interstellar Water Masers in HII Regions

Published online by Cambridge University Press:  14 August 2015

G.J. White  and
G.H. Macdonald
G.J. White
Affiliation:
1Physics Dept., Queen Mary College, University of London, U.K.
G.H. Macdonald
Affiliation:
2Electronics Laboratory, University of Kent at Canterbury, U.K.

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Previous studies of time variations in water vapour sources associated with HII regions by Sullivan (1971, 1973) and Gammon (1976) have revealed variability on time-scales of 106-107s. Sullivan monitored nine sources over a period of 14 months and Gammon observed W49 (H2O) for 13 months. In an attempt to gather more complete information on the variability of interstellar water masers we have monitored 18 sources for the 32-month period 1974 September-1977 May. The sources selected are listed in Table 1. They were the strongest known at the beginning of the programme above declination −20°.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 87: Interstellar Molecules , 1980 , pp. 593 - 598
Copyright
Copyright © Reidel 1980 

References

Gammon, R.H. 1976. Astron. Astrophys., 50, pp. 71-77.Google Scholar
Genzel, R. and Downes, D., 1977. Astron. Astrophys. Suppl., 30, pp. 145-168.Google Scholar
Genzel, R., et al., 1978. Astron. Astrophys., 66, pp. 13-29.Google Scholar
Goldreich, P. and Kwan, J., 1974. Astrophys. J., 191, pp. 93-100.CrossRefGoogle Scholar
de Jong, T. 1973. Astron. Astrophys., 26, pp. 297-313.Google Scholar
Little, L.T., White, G.J. and Riley, P.W., 1977. Mon. Not. R. astr. Soc., 180, pp. 639-656.CrossRefGoogle Scholar
Litvak, M.M., 1969. Science, 165, pp. 855-861.CrossRefGoogle Scholar
Oka, T., 1973. Molecules in the Galactic Environment, pp. 258-266, Wiley Interscience, New York.Google Scholar
Salem, M. and Middleton, M.S., 1978. Mon. Not. R. astr. Soc., 183, pp. 491-500.CrossRefGoogle Scholar
Sullivan, W.T., 1971. Astrophys. J., 166, pp. 321-332.CrossRefGoogle Scholar
Sullivan, W.T., 1973. Astrophys. J. Suppl., 25, pp. 393-432.CrossRefGoogle Scholar
Walker, R.G., et al., 1977. Astrophys. J., 211, L135-L138.CrossRefGoogle Scholar
White, G.J., 1979. Mon. Not. R. astr. Soc., 186, pp. 377-381.CrossRefGoogle Scholar