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uvby photometry with a CCD

Published online by Cambridge University Press:  04 August 2017

Barbara J. Anthony-Twarog
Barbara J. Anthony-Twarog*
Affiliation:
Physics and Astronomy Department, University of Kansas, Lawrence, Kansas 66045 U.S.A.

Extract

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Initial observations using uvby filters with a CCD detector were completed in June of 1985, using the Cerro Tololo 4m PFCCD system. It has been possible to derive all Strömgren indices (b-y, m1 and c1) for V<18 from frames with acceptable integration times. For fields in the open cluster IC 4651, averages of 2 to 3 frames with exposure times of 15, 20, 40, and 500 seconds for the y, b, v, and u filters, yielded high precision magnitudes and indices for V<15. Exposure times up to 5 times longer were required for the v and u filters in order to derive c1 indices of sufficient precision for stars with V between 15 and 16. One result of our survey is the apparent absence of main sequence stars below V = 15.

Type
II. Photometric Research Programmes
Information
Symposium - International Astronomical Union , Volume 118: Instrumentation and Research Programmes for Small Telescopes , 1986 , pp. 267 - 268
Copyright
Copyright © Reidel 1986 

References

VandenBerg, D.A., and Bell, R.A. 1985. Astrophysical Journal Supplement, 58, 561.CrossRefGoogle Scholar