Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...112..149s&link_type=abstract
Astronomy and Astrophysics, vol. 112, no. 1, Aug. 1982, p. 149-156. Research supported by the Institiuid Ard-Leinn Bhaile Atha
Astronomy and Astrophysics
Astrophysics
29
Cepheid Variables, Distance, Stellar Color, Stellar Luminosity, Stellar Models, Interstellar Extinction, Periodic Variations, Stellar Magnitude, Stellar Spectrophotometry
Scientific paper
It is contended that the canonical Cepheid period-luminosity-color (PLC) relation leads to an incorrect cosmic distance scale. Numerical simulations reveal a very narrow Cepheid instability strip and appreciable reddening scatter among LMC Cepheids. It is noted that the precision of Cepheid reddenings given in the literature can be shown to be at best of comparable order to the instability strip width. It is recommended that the PLC relation be abandoned as a cosmic distance indicator in favor of the period-luminosity relation, which is reasonably well established. The advantages of Cepheid mean magnitudes and colors at standard period as compared with period-luminosity and period-color relation zero-points are enumerated, and a new LMC distance modulus is derived.
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