Advertisement

Preliminary results from a study of the proper motion of water vapor masers in cepheus A

  • T. V. Cawthorne
  • J. M. Moran
  • M. J. Reid
9. Proper Motion
Part of the Lecture Notes in Physics book series (LNP, volume 412)

Abstract

Preliminary results from a study of the proper motions of water vapor masers associated with HII regions in Cepheus A are presented. The masers lie in two distinct clumps near the peaks in intensity of the HII regions. Some 50 maser spots were detected over 3 epochs, but only 11 maser spots were identified at two or more epochs. A statistical parallax analysis from these prelimary results gives a distance between 0.4 and 0.6kpc with a statistical uncertainty of about 0.2kpc.

References

  1. Blaauw, A. 1964, Ann. Rev. Astr. Ap., 2, 261.Google Scholar
  2. Cohen, R.J., Rowland, P.R. and Blair, M.M. 1984, M.N.R.A.S., 210, 425.Google Scholar
  3. Hughes, V.A. and Wouterloot, J.G.A. 1984. Ap. J., 276, 204.Google Scholar
  4. Lada, C.J., Blitz, L., Reid, M.J. and Moran, M.J. 1981 Ap. J., 243, 769.Google Scholar
  5. Migenes, V., Cohen, R.J. and Brebner, G.C. 1991, M.NR.A.S., 254,, 501.Google Scholar

Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • T. V. Cawthorne
    • 1
  • J. M. Moran
    • 1
  • M. J. Reid
    • 1
  1. 1.Harvard-Smithsonian Center for AstrophysicsCambridge

Personalised recommendations