Near-infrared observations of Cepheids - The distance to M33

Astronomy and Astrophysics – Astronomy

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Cepheid Variables, Infrared Photometry, Light Curve, Local Group (Astronomy), Reference Stars, Spiral Galaxies, Distance, H Lines, Interstellar Extinction, Luminosity, Magellanic Clouds, Near Infrared Radiation, Stellar Magnitude

Scientific paper

Random-phase 1.65-micron observations of 15 Cepheids in M33, obtained using the NASA IRTF, the 5-m Hale telescope, the Canada-France-Hawaii telescope, and the MMT during 1980-1983 are reported and analyzed to estimate the distance to M33. The data are presented in tables and graphs and fitted to an IR period/luminosity relation for the Galaxy and the Magellanic Clouds. The M33 distance modulus is given as 24.5 + or - 0.2 mag, or 24.3 + or - 0.2 mag with a reddening correction based on the blue-band data of Sandage (1983).

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