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The Nature of Symbiotic Stars pp 209–211Cite as

HM Sagittae — A most Remarkable Star

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Part of the book series: Astrophysics and Space Science Library ((ASSL,volume 95))

Abstract

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).

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Author information

Authors and Affiliations

  1. Herzberg Institute of Astrophysics National Research Council of Canada, Ottawa, Canada, K1A 0R6

    Sun Kwok

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  1. Sun Kwok
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Editor information

Editors and Affiliations

  1. Institut d’Astrophysique (CNRS), Paris, France

    Michael Friedjung

  2. Istituto Astrofisica Spaziale (CNR), Frascati, Italy

    Roberto Viotti

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© 1982 D. Reidel Publishing Company, Dordrecht, Holland

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Kwok, S. (1982). HM Sagittae — A most Remarkable Star. In: Friedjung, M., Viotti, R. (eds) The Nature of Symbiotic Stars. Astrophysics and Space Science Library, vol 95. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7834-8_39

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  • DOI: https://doi.org/10.1007/978-94-009-7834-8_39

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-009-7836-2

  • Online ISBN: 978-94-009-7834-8

  • eBook Packages: Springer Book Archive

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