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Standard Stars: CCD Photometry, Transformations and Comparisons

Published online by Cambridge University Press:  05 March 2013

Hwankyung Sung  and
Michael. S. Bessell
Hwankyung Sung
Affiliation:
Bohyun-san Optical Astronomy Observatory, Yeongcheon 770-820, Korea; [email protected]
Michael. S. Bessell
Affiliation:
Research School of Astronomy & Astrophysics, Australian National University, Private Bag, Weston Creek PO, ACT 2611, Australia
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Abstract

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We discuss variations of the atmospheric extinction coefficients and transformation equations to the standard UBVRI system based on observations of standard stars during 1996–1997 at Siding Spring Observatory using a thinned SITe CCD and coloured glass filters. In the transformation from the initial natural system to the Landolt version of the standard system, a large nonlinear term related to the Balmer discontinuity was required for the U transformation. We then modified the U filter, and the subsequent transformation to the SAAO version of the standard UBVRI system had only small nonlinear correction terms for U, B, and I. The correction terms relating to U and B are evidently due to the Balmer discontinuity, while that relating to I seems to be due to the Paschen discontinuity at λ ≈ 8200 Å. We also compared the results with Landolt's observations, and confirmed the difference between the two sets of standard stars (SAAO and Landolt).

Keywords

techniques: photometricstars: imagingstandards
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 17 , Issue 3 , 2000 , pp. 244 - 254
Copyright
Copyright © Astronomical Society of Australia 2000

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