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The Absolute Magnitude and Stellar Population of a Ba II Star

Published online by Cambridge University Press:  07 February 2017

R. D. McClure
R. D. McClure*
Affiliation:
Yale University Observatory, U.S.A.

Abstract

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A star showing extreme features characteristic of the Ba II stars has been found in the old open cluster NGC 2420. A new colour-magnitude diagram has been constructed for the cluster, and a distance modulus of 11m.7 is obtained by fitting the unevolved main sequence to the zero-age main sequence. The location of the Ba II star is consistent with its being a disc population star of absolute magnitude Mv = −0m.3, mass 1.4 M⊙ and age 2.4 × 109 yr.

Type
Part VI: The Use of Model Atmospheres for Temperature
Information
Symposium - International Astronomical Union , Volume 54: Problems of Calibration of Absolute Magnitudes and Temperature of Stars , 1973 , pp. 225 - 228
Copyright
Copyright © Reidel 1973 

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