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The NGC 6752 HR-diagram

Published online by Cambridge University Press:  04 August 2017

M. Grenon  and
A. Blecha
M. Grenon
Affiliation:
Observatoire de Genève
A. Blecha
Affiliation:
Observatoire de Genève

Extract

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Deep electronographic photometry has been performed down to mv 21.7 with the 90 mm McMullan camera on the Danish 1.54 m telescope at La Silla. Three exposures per colour were obtained. The plates have been scanned with the Geneva microdensitometer. The selected stars are isolated and are located in the outer corona. The magnitudes are obtained by the profile fitting method, cf. Blecha (1982), which enhances the dynamical range of the plate and reduces the noise due to crowding. The random error appears magnitude independent down to mv = 21 with σ = .05 per colour. Below mv = 20 a number of galaxies were identified and rejected according to their image profiles.

Type
I. EVOLUTION OF LOW AND INTERMEDIATE MASS STARS OBSERVATIONS AND MODELS
Information
Symposium - International Astronomical Union , Volume 105: Observational Tests of the Stellar Evolution Theory , 1984 , pp. 163 - 165
Copyright
Copyright © Reidel 1984 

References

Blecha, A. 1982, Bulletin Inf. CDS 22, 25.Google Scholar
Carney, B.W. 1979, Astron. J. 84, 515.CrossRefGoogle Scholar
Ciardullo, R.B., Demarque, P. 1977, Yale Trans. 33.Google Scholar
Grenon, M. 1982, IAU Coll. 68, 393.Google Scholar
Harris, W.E. 1980, IAU Coll. 85, 91.Google Scholar
VandenBerg, D.A. 1983, Astrophys. J. Suppl. 51, 29.Google Scholar