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Faint Secondary Standards for Spectrophotometry and the Energy Distributions of Horizontal-Branch A-Stars

Published online by Cambridge University Press:  04 August 2017

D. S. Hayes  and
A. G. Davis Philip
D. S. Hayes
Affiliation:
Kitt Peak National Observatory, National Optical Astronomy Observatories*
A. G. Davis Philip
Affiliation:
Van Vleck Observatory and Union College

Extract

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The energy distributions of 16 horizontal-branch A-stars and 11 horizontal-branch stars in globular clusters have been measured using the Harvard Scanners at KPNO and CTIO and the Oke multichannel spectrophotometer on the 5-m telescope at Mt. Palomar (Philip and Hayes 1983, Hayes and Philip 1983). Wavelengths between 3400 and 6800 Å were measured and reduced to absolute energy distributions on the system of Hayes and Latham (1975). The internal measuring errors were ± 0.034 mag. per observation for the 15th mag. globular cluster stars and ±0.025 mag. per observation for the 7th to 11th mag. field stars, averaged over all wavelengths. Eleven of the field stars have been observed over nine times each and have low internal measurement errors; these stars plus four globular cluster stars with low internal measurement errors are recommended as secondary standard stars. (See Table I.)

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 111: Calibration of Fundamental Stellar Quantities , 1985 , pp. 469 - 472
Copyright
Copyright © Reidel 1985 

References

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