학술논문
Correcting CCD photometry of stars for seeing effects
Document Type
Report
Author
Source
Monthly Notices of the Royal Astronomical Society. May, 2009, Vol. 395 Issue 1, p531, 6 p.
Subject
Language
English
ISSN
0035-8711
Abstract
To authenticate to the full-text of this article, please visit this link: http://dx.doi.org/10.1111/j.1365-2966.2009.14574.x Byline: Chris Koen (1★) Keywords: methods: data analysis; techniques: photometric Abstract: ABSTRACT Systematic variability in stellar magnitudes, as derived from profile fitting to CCD images, may in some instances be due to variable seeing. It is suggested that this happens in cases where the stars are unresolved pairs, typically with sub-arcsecond separation between the components. It is shown that the fitting of suitable Generalised Additive Models to time series photometry can disentangle intrinsic stellar variability and seeing-induced brightness changes. It is possible that there will be a fixed seeing response associated with a given star which exhibits the effect: estimation of this response from several long photometric runs is demonstrated. Author Affiliation: (1)Department of Statistics, University of the Western Cape, Private Bag X17, Bellville, 7535 Cape, South Africa Article History: Accepted 2009 January 29. Received 2008 December 8; in original form 2008 September 25 Article note: (★) E-mail: ckoen@uwc.ac.za