The Physical Properties of the Red Giants in M67
Open Access
- 1 August 1974
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 168 (2) , 291-296
- https://doi.org/10.1093/mnras/168.2.291
Abstract
The effective temperatures, surface gravities and masses of 16 red giant members of the old galactic cluster M67 have been derived from existing intermediate-band photometry on the David Dunlap Observatory (DDO) system. Most of the stars have masses in the range 1.5–2.5 ℳ⊙ but two stars were found to have considerably smaller masses of the order of ℳ⊙ which may indicate that they are in the horizontal branch stage of evolution after having suffered mass loss. The derived physical parameters have been used to estimate the helium abundance of the cluster by the method given by Gross with the result YM67 ≥0.20.Keywords
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