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Infrared Observations of Galactic Cepheids

Published online by Cambridge University Press:  12 April 2016

J. A. Fernley ,
R. F. Jameson  and
M. R. Sherrington
J. A. Fernley
Affiliation:
University of Leicester, Leicester, United Kingdom
R. F. Jameson
Affiliation:
University of Leicester, Leicester, United Kingdom
M. R. Sherrington
Affiliation:
University of Leicester, Leicester, United Kingdom

Abstract

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Infrared photometry enables radii, and hence absolute magnitudes, to be derived more accurately than is possible using purely optical photometry. In this paper we present BVJHK observations of the galactic cepheids T Vul, U Vul and T Mon. Using this data we find reasonable agreement with current versions of the Period-Luminosity relations, in both the optical and infrared.

From these relations and existing optical and infrared data for LMC Cepheids we find for the LMC (i) Av = 0.35 and (ii) a distance modulus of 18.50. In addition we show that the P-L-C relation has the form

<Mv> = – 3.10 log P + 1.70 (<B>–<V>) – 2.37

Type
Part I. Fundamental Parameters
Information
International Astronomical Union Colloquium , Volume 82: Cepheids: Theory and Observations , 1985 , pp. 58 - 62
Copyright
Copyright © Cambridge University Press 1985

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