Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..240..328m&link_type=abstract
Binary Stars as Critical Tools and Tests in Contemporary Astrophysics, International Astronomical Union. Symposium no. 240, he
Astronomy and Astrophysics
Astrophysics
Scientific paper
Differential photometry is a robust technique for ground-based observations of transits since it sorts out slow variations of sky transparency as well as other first order effects that are common to all stars in the field-of-view (FOV) of the imaging detector. To work properly, differential photometry has a few requirements like similar brightness of the target and reference stars, similar colours and a relative proximity in the plane of the sky to avoid sensitivity variations like those caused by vignetting in the FOV. It happens that for bright stars these conditions are hardly met. Typical CCDs in a ~60 cm class telescope give a FOV of ~10 arcmin and this is not enough to have in the same image frame suitable reference stars. Also, bright (V < 7) tend to saturate the detector for the shortest practical integration time. To minimize these problems, we tested an instrumental setup in which half of the detector is covered with a neutral density (D=2.3) filter. We report CCD observations on which we achieved milimagnitude precision for bright systems that are not known to show transits, like Tau Boo, 55 Cnc and HD 162020, as well as the well known case of HD 209458.
Jablonski Francisco
Martioli Eder
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