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Radio observations and the mass flow rate of α Cyg (A2Ia)

Published online by Cambridge University Press:  12 April 2016

B. Wolf ,
O. Stahl  and
W.J. Altenhoff
B. Wolf*
Affiliation:
Remeis-Sternwarte Bamberg, Astronomisches Institut der Universität Erlangen-Nürnberg
O. Stahl
Affiliation:
Remeis-Sternwarte Bamberg, Astronomisches Institut der Universität Erlangen-Nürnberg
W.J. Altenhoff
Affiliation:
Max-Planck-Institut für Radioastronomie
*
1Permanent address : Landessternwarte Königstuhl , Heidelberg.

Extract

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From the free-free excess at 10μ. Barlow and Cohen (1977) (hereafter referred to as BC) derived a mass loss rate of 6.9 10-7 M⊙ yr-1 for α Cyg. They predicted a 10 GHz radio flux of 2.2 mJy. On the other hand Praderie et al. (1980) derived a considerable lower mass loss rate of 1.1 10 -8 ≤Ṁ ≤ 7 10-8 M ⊙ yr-1 from a curve of growth analysis of the envelope ultraviolet Fell-lines of α Cyg. Radio observations are desirable to make a decision about these discrepant results. Therefore we observed α Cyg at 15 GHz with the 100 m telescope of the MPIfR at Effelsberg. The observations are discussed together with recent VLA data of Abbott et al. (1980).

Type
Session I - Winds from Early Type Stars: Observations
Information
International Astronomical Union Colloquium , Volume 59: Effects of Mass Loss on Stellar Evolution , 1981 , pp. 61 - 64
Copyright
Copyright © Reidel 1981

References

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