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Classical Cepheids, what else?

Published online by Cambridge University Press:  26 February 2013

G. Bono ,
L. Inno ,
N. Matsunaga ,
K. Genovali ,
B. Lemasle ,
F. Primas  and
M. Romaniello
G. Bono
Affiliation:
Dipartimento di Fisica, Università di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Roma, Italy email: [email protected] INAF–OAR, via Frascati 33, 00040 Monte Porzio Catone, Italy
L. Inno
Affiliation:
Dipartimento di Fisica, Università di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Roma, Italy email: [email protected] ESO, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany
N. Matsunaga
Affiliation:
Department of Astronomy, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
K. Genovali
Affiliation:
Dipartimento di Fisica, Università di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Roma, Italy email: [email protected]
B. Lemasle
Affiliation:
Sterrenkundig Instituut ‘Anton Pannekoek’, University of Amsterdam, Science Park 904, P.O. Box 94249, 1090 GE Amsterdam, The Netherlands
F. Primas
Affiliation:
ESO, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany
M. Romaniello
Affiliation:
ESO, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany
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Abstract

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We present new and independent estimates of the distances to the Magellanic Clouds (MCs) using near-infrared (NIR) and optical–NIR period–Wesenheit (PW) relations. The slopes of the PW relations are, within the dispersion, linear over the entire period range and independent of metal content. The absolute zero points were fixed using Galactic Cepheids with distances based on the infrared surface-brightness method. The true distance modulus we found for the Large Magellanic Cloud—(m − M)0 = 18.48 ± 0.01 ± 0.10 mag—and the Small Magellanic Cloud—(m − M)0 = 18.94 ± 0.01 ± 0.10 mag—agree quite well with similar distance determinations based on robust distance indicators. We also briefly discuss the evolutionary and pulsation properties of MC Cepheids.

Keywords

distance scaleMagellanic Cloudsstars: evolutionstars: pulsations
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S289: Advancing the Physics of Cosmic Distances , August 2012 , pp. 116 - 125
Copyright
Copyright © International Astronomical Union 2013

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