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Mass loss in M67 giants - Evidence from isochrone fittingA comparison between the color-magnitude diagram of M67 and a new set of theoretical evolutionary models which include all phases from the unevolved main-sequence through core-helium burning and onto the AGB is presented. The present 5-Gyr solar abundance isochrone is found to yield an excellent fit to the whole of the M67 color-magnitude diagram. A differential technique that compares the gap in color between clump giants and normal red giants, on one hand, with the temperature gap between core He-burning tracks and first-ascent RGB tracks, on the other, strongly indicates that the clump giants in M67 have masses of 0.70 solar mass or less. The extremely large amount of mass loss that is deduced is well in excess of that found for globular cluster stars. Possible resolutions of this problem are that degree of mass loss increases with total stellar mass, or with metallicity.
Document ID
19930066919
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Tripicco, Michael J.
(Maryland Univ. College Park, United States)
Dorman, Ben
(Virginia Univ. Charlottesville, United States)
Bell, R. A.
(Space Telescope Science Inst. Baltimore, MD, United States)
Date Acquired
August 16, 2013
Publication Date
August 1, 1993
Publication Information
Publication: Astronomical Journal
Volume: 106
Issue: 2
ISSN: 0004-6256
Subject Category
Astrophysics
Accession Number
93A50916
Funding Number(s)
CONTRACT_GRANT: NAGW-2596
CONTRACT_GRANT: NSF AST-91-22361
CONTRACT_GRANT: NSF AST-89-18461
Distribution Limits
Public
Copyright
Other

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