Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...332l..63f&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 332, Sept. 15, 1988, p. L63-L66. Research supported by the Canada
Astronomy and Astrophysics
Astrophysics
113
Astronomical Photometry, Cepheid Variables, Spiral Galaxies, Charge Coupled Devices, Error Analysis, Magellanic Clouds, Northern Hemisphere
Scientific paper
Photometric observations of two Cepheids in M81 and eight Cepheids in NGC 2403, obtained in the I band using prime-focus CCD cameras on the 3.6-m Canada-France-Hawaii Telescope and the 4.0-m telescope at KPNO during January 1988, are reported. The data are presented in tables and a period-luminosity plot and discussed in detail. The apparent I-band and true (upper-limit) distance moduli for M81 are calculated as 27.64 + or - 0.09 mag and 27.59 + or - 0.31, respectively; the corresponding values for NGC 2403 are 27.57 + or - 0.14 mag and 27.51 + or - 0.24 mag, respectively; the true moduli are equivalent to distances of 3.3 + or - 0.5 Mpc for M81 and 3.2 + or - 0.4 Mpc for NGC 2403.
Freedman Wendy L.
Madore Barry F.
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