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Extended Strömgren Photometry with CCD’s

Published online by Cambridge University Press:  12 April 2016

B.J. Anthony-Twarog  and
B.A. Twarog
B.J. Anthony-Twarog
Affiliation:
University of Kansas, Lawrence, Kansas, U.S.A.
B.A. Twarog
Affiliation:
University of Kansas, Lawrence, Kansas, U.S.A.

Abstract

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CCD’s have made possible the extension of intermediate-band photometric systems, including the Strömgren uvby system, to larger, fainter and cooler stars, with successful applications in old disk and globular clusters. Some of the applications in globular clusters demonstrate the ability to remove foreground stars from photometric diagrams and have enabled a re-evaluation of the evolutionary correction needed for distance modulus determination for metal-poor stars. We have developed an additional index based on measurement of the Ca II H and K lines which retains sensitivity to metallicity changes for extremely metal-poor stars. Finally, we are testing the utility of CCD H/β photometry in the unusual and old open cluster Melotte 66.

Type
Session 6 Photometry with CCDs
Information
International Astronomical Union Colloquium , Volume 136: Stellar Photometry – Current Techniques and Future Developments , 1993 , pp. 325 - 331
Copyright
Copyright © C.J. Butler and I. Elliottt 1993

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