Cepheids as distance indicators when used near their detection limit

Details Cepheids as distance indicators when used near their detection limit Cepheids as distance indicators when used near their detection limit

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pasp..100..935s&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 100, Aug. 1988, p. 935-948.

Astronomy and Astrophysics

Astronomy

47

Cepheid Variables, Distance, Galaxies, Hubble Constant, Magellanic Clouds, Photoelectron Spectroscopy, Stellar Envelopes, Stellar Magnitude

Scientific paper

An observational selection bias for Cepheid variables is found that flattens an observed P-L relation from its true slope. The existence of this bias is demonstrated by truncating an unbiased list of Cepheids in the LMC at progressively brighter magnitudes and showing that the slope of the P-L relation of the remaining variables is too shallow. The slope effect is illustrated using data for nine variables in the LMC. Apparent distance moduli in the B band relative to the LMC of 5.65 for NGC 6822, 5.65 for IC 1613, 6.0 for M 31, 6.2 for WLM, 6.3 for M 33, 7.3 for Sextans A and B, 7.4 for NGC 3109, and 7.6 for NGC 300 are obtained.

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