HM Sagittae — A most Remarkable Star

  • Sun Kwok
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 95)


HM Sagittae is one of the most unusual objects in the Galaxy for it displays activity in every spectral band from x-ray to radio. Its present variable-star designation was given after the discovery of its optical brightening from 16mto 12m between April and September 1975 (Dokuchaeva and Balazs 1976). It was soon found to have a rich emission-line spectrum similar to that of a planetary nebula (Stover and Sivertsen 1977). Post-brightening monitoring of the object by Ciatti, Mammano and Vittone (1977, 1978) found the B and V magnitudes to be variable with amplitudes of at least one magnitude. Evidence for increasing excitation was found by Ciatti, Mammano and Vittone (1979) with HeII 4686 emerging in October 1978. Wolf-Rayet features of velocities up to 2000 km s−1 have also been seen (Belyakina, Gershberg and Shakhovskaya 1978, 1979; Brown et al. 1978; Ciatti et al. 1978; Wallerstein 1978; Allen 1980; Andrillat and Swings 1982). Analysis of the forbidden line ratios gives an estimated nebula density of 106-107 cm−3 and a gas temperature >104K (Ciatti et al. 1977; Arkhipova and Dokuchaeva 1978; Davidson, Humphreys and Merrill 1979; Arkhipova, Dokuchaeva and Esipov 1979).


Radio Emission Mass Loss Rate Stellar Wind Planetary Nebula Asymptotic Giant Branch 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. Allen, D.A. 1980, Mon. Not. Roy Astron. Soc., 190, 75.ADSGoogle Scholar
  2. — 1981, paper presented at the North American Workshop on Symbiotic Stars, Boulder.Google Scholar
  3. Andrillat, Y. and Swing, J.P. 1982, this volume.Google Scholar
  4. Arkhipova, V.P. and Dokuchaeva, P.D. 1978, Sov. Astron. Letters, 4(1), 48.ADSGoogle Scholar
  5. Arkhipova, V.P., Dukuchaeva, P.D. and Esipov, V.F. 1979, Sov. Astron., 23(2), 174.ADSGoogle Scholar
  6. Belyakina, T.S., Gershberg, R.E. and Shakhovskaya, N.I. 1978, Sov. Astron. Letters, 4(5), 219.ADSGoogle Scholar
  7. Gershberg, R.E. and Shakhovskaya, N.I. — 1979, Sov. Astron. Letters, 5(6), 349.ADSGoogle Scholar
  8. Brown, L.W., Feibelman, W.A., Hobbs, R.W., McCracken, C.W. Astrophys. Letters, 19, 75.Google Scholar
  9. Ciatti, F., Mammano, A. and Vittone, A. 1977, Astron. Astrophys., 61, 459.ADSGoogle Scholar
  10. Mammano, A. and Vittone, A. — 1978, Astron. Astrophys., 68, 751.Google Scholar
  11. Mammano, A. and Vittone, A. — 1979, Astron. Astrophys., 79, 247.ADSGoogle Scholar
  12. Davidson, K., Humphreys, R.M. and Merrill, K.M. 1978, Astrophys., J., 220, 239.ADSCrossRefGoogle Scholar
  13. Dokuchaeva, P.D. and Balazs, B. 1976, Astron. Tsink., No. 929, 1.ADSGoogle Scholar
  14. Feibelman, W.A., Boggess, A., Hobbs, R.W. and McCracken, C.W. 1980, Astrophys. J., 241, 725.ADSCrossRefGoogle Scholar
  15. Feldman, P.A. 1977, J. Roy. Astron. Soc. Canada, 71, 386.ADSGoogle Scholar
  16. Flower, D.R., Nussbaumer, H. and Schild, H. 1979, Astron. Astrophys., 72., L1.ADSGoogle Scholar
  17. Kwok, S. 1982, this volume.Google Scholar
  18. Kwok, S. and Purton, C.R. 1979, Astrophys. J., 229, 187.ADSCrossRefGoogle Scholar
  19. Kwok, S., Bignell, C. and Purton, C.R. 1982, in preparation.Google Scholar
  20. Puetter, R.C., Russell, R.W., Soifer, B.T., Willner, S.P. 1978, Astrophys. J. (Letters), 223, L93.ADSCrossRefGoogle Scholar
  21. Slovak, M.H. 1978, Astron. Astrophys., 70, L75.ADSGoogle Scholar
  22. Stover, R.J. and Sivertsen, S. 1977, Astrophys. J. (Letters), 214, L33.ADSCrossRefGoogle Scholar
  23. Taranova, O.G. and Yudin, B.F. 1980, Sov. Astorn. Letters, 6(4), 273.ADSGoogle Scholar
  24. Thronson, H. and Harvey, P.M. 1981, Astrophys. J., in press.Google Scholar
  25. Wallerstein, G. 1978, Publ. Astron. Soc. Pacific, 90, 36.ADSCrossRefGoogle Scholar
  26. Willson, L.A. 1981, paper presented at the North American Workshop on Symbiotic Stars, Boulder.Google Scholar

Copyright information

© D. Reidel Publishing Company, Dordrecht, Holland 1982

Authors and Affiliations

  • Sun Kwok
    • 1
  1. 1.Herzberg Institute of Astrophysics National Research Council of CanadaOttawaCanada

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