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February 1, 1982

The period-luminosity relation. IV - Intrinsic relations and reddenings for the Large Magellanic Cloud Cepheids

Key Points

The aim is to investigate the intrinsic calibration of the period-luminosity relation for Cepheids in the Large Magellanic Cloud.
Utilized period, amplitude, and Wesenheit function to analyze Cepheids' light properties.
Applied photoelectric B and V band photometry in the Large Magellanic Cloud (LMC).
Inverted relations to determine individual reddenings of Cepheids.
Detected varying reddening levels in individual Cepheids, confirming internal absorption in the LMC.
Established that longer-period Cepheids are more obscured than shorter-period ones.
Amplitude increases systematically toward the cool edge of the instability strip.

Abstract

Period, amplitude and the Wesenheit function are used to probe the intrinsic calibration of the period-luminosity relation for Cepheids with photoelectric B, V, photometry in the LMC. The relations are inverted to determine reddenings to the individual Cepheids, confirming earlier indications that detectable absorption exists within the LMC itself, and that longer-period Cepheids are systematically more heavily obscured. Amplitude is shown to vary systematically across the instability strip such that at all periods amplitude increases toward the cool edge.

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The Astrophysical Journal

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