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Spectroscopic observations of AG Dra

Published online by Cambridge University Press:  12 April 2016

Huang Chang-Chun
Huang Chang-Chun*
Affiliation:
Purple Mountain Observatory, Academia Sinica

Extract

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AG Dra is an interesting symbiotic star, on account of its very high negative velocity and its earlier spectral type among the symbiotic stars. This star has been classified as dG7 (Wilson,1943), K1 II (Roman,1953) and K3 III (Boyarchuk,1966). It has a variable radial velocity.

During summer 1981, spectroscopic observations of AG Dra were performed at the Haute-Provence Observatory using the Marly spectrograph with a dispersion of 80 A mm-1 at the 120 cm telescope and using the Coudé spectrograph of the 193 cm telescope with a dispersion of 40 A mm-1. Professor Ch. Fehrenbach very kindly given me a plate of the star which he had taken in July,1966, using the coudé spectrograph of the 193 cm telescope with a dispersion of 40 A mm-1.

Type
Session II – Discussion on Individual Stars
Information
International Astronomical Union Colloquium , Volume 70: The Nature of Symbiotic Stars , 1982 , pp. 185 - 189
Copyright
Copyright © Reidel 1982

References

Andrillat, Y.: 1979, I.A.U. Colloquium n° 47, 137. Vatican Observatory. Google Scholar
Boyarchuk, A.A.,: 1966, Astrofizika, Vol.2,n° 1,50. Google Scholar
Roman, N.G.,: 1953, AP.J., 117, 467.Google Scholar
Wilson, R.E., Pub. A.S.P., 55, 282, 1943 ; 57,309, 1945.Google Scholar