Infrared photometry of Magellanic Cloud Cepheids - Intrinsic properties of Cepheids and the spatial structure of Clouds

Details Infrared photometry of Magellanic Cloud Cepheids - Intrinsic properties of Cepheids and the spatial structure of Clouds Infrared photometry of Magellanic Cloud Cepheids - Intrinsic properties of Cepheids and the spatial structure of Clouds

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.222..449l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 222, Oct. 1, 1986, p. 449-472.

Astronomy and Astrophysics

Astronomy

91

Cepheid Variables, Infrared Photometry, Magellanic Clouds, Spatial Distribution, Interstellar Extinction, Light Curve, Stellar Color, Stellar Magnitude

Scientific paper

JHK photometry has been obtained for 21 Cepheids in the LMC and 23 Cepheids in the SMC. From dereddened mean magnitudes and colours, the period-luminosity, period-colour and period-luminosity-colour relations in the infrared are derived. The colour term in the infrared is found to be significant, not caused by differential reddening, and in agreement with the theoretical value. Both the structure of the LMC and the SMC can be approximated by inclined planes, but the structure in the SMC is more complex and shows much greater depth effects than in the LMC. The correlation of the structure of the SMC with the H I radio maps is discussed. With the zero point of the infrared PL and PLC relations determined by infrared observations of galactic calibrating Cepheids in the same period range, the distance moduli to the Clouds are (m-M)0 = 18.73 (LMC) and (m-M)0 = 19.05 (SMC main body), corresponding to distances of 56 and 65 kpc respectively.

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