Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...322..751l&link_type=abstract
Astronomy and Astrophysics, v.322, p.751-755
Astronomy and Astrophysics
Astrophysics
16
Methods: Data Analysis, Techniques: Photometric, Stars: Fundamental Parameters, Cepheids
Scientific paper
The successful discovery of Cepheids in nearby galaxies with HST has triggered the development of a both simple and effective method to determine mean magnitudes from a few scattered measurements in combination with the complete light curve observed in V. Based on the empirically derived variation of the scaled difference of magnitude deflections at two passbands with phase, correction values are obtained to transfer the complete light curve in V into light curves in B, R and I, respectively. Applied to isolated observations, the procedure yields a mean magnitude for each phase point observed at that passband. With three to four measurements, the accuracy of the final mean magnitude obtained for Cepheids with normal light curves is comparable to the value obtained from complete light curves.
Labhardt Lukas
Sandage Alan
Tammann Gustav A.
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