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Globular Cluster Winds

Published online by Cambridge University Press:  25 April 2016

D.J. Faulkner  and
K.C. Freeman
D.J. Faulkner
Affiliation:
Mount stromio and Siding Spring Observatory, Research School of Physical Sciences, Australian National University
K.C. Freeman
Affiliation:
Mount stromio and Siding Spring Observatory, Research School of Physical Sciences, Australian National University
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Extract

Current evolutionary theory indicates that evolving stars in globular clusters arrive on the horizontal branch with ~30% less mass than they had on the main sequence. If, as seems likely, this mass loss results from the outflow of unprocessed material at the stellar surface during the giant stage, and if the ejected mass were retained within the cluster between successive sweeps through the galactic plane (~108 yr), sufficient hydrogen (100-2000 M⊙ should accumulate for detection. Radio searches, however, have failed to find evidence for either neutral or ionized gas. The hydrogen mass upper limits obtained by various workers are: Hills and Klein (1973) ionized H, 3.8 cm, <20-200 M⊙; Knapp, Rose and Kerr (1973) neutral H, 21 cm, <1-20 M⊙; Conklin and Kimble (1974) neutral H, 21 cm, <0.7-1.4 M⊙.

We have extended the search into the optical region and have also calculated time-independent gas flow models to try to resolve this anomaly.

Type
Contributions
Information
Publications of the Astronomical Society of Australia , Volume 2 , Issue 6 , October 1975 , pp. 356 - 358
Copyright
Copyright © Astronomical Society of Australia 1975

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References

Conklin, E.K., and Kimble, R.A., Bull. A.A.S., 6, 468 (1974).Google Scholar
Cox, D.P., and Daltabuit, E., Astrophys. J., 167, 113 (1971).CrossRefGoogle Scholar
Cox, D.P., and Tucker, W.H., Astrophys. J., 157, 1157 (1969).Google Scholar
Hills, J.G., and Klein, M.J., Astrophys. Lett., 13, 65 (1973).Google Scholar
King, I.R., Astron. J., 71, 64 (1966).Google Scholar
Knapp, G.R., Rose, W.K., and Kerr, F.J., Astrophys. J., 186, 831 (1973).CrossRefGoogle Scholar
Peterson, C.J., and King, I.R., reprint ‘The structure of star clusters. VI. Observed radii and structural parameters in globular clusters’ submitted to Astron. J. (1975).Google Scholar