Bias in the Cepheid PL relation.

Details Bias in the Cepheid PL relation. Bias in the Cepheid PL relation.

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999crasb.327..431l&link_type=abstract

Comptes Rendus de l'Academie des Sciences, Sér. II, Fasc. b, Tome 327, No. 4, p. 431 - 436

Computer Science

1

Period-Luminosity Relation: Cepheids, Cepheids: Distance Scale, Cepheids: Galaxies, Distance Scale: Extragalactic

Scientific paper

The authors show that the Cepheid PL relation is affected by a Malmquist type bias, that of so-called population incompleteness. Its calculated slope appears shallower than the true one because of the cut-off in apparent magnitude due to the instrumental limiting magnitude. Furthermore, the use of the PL relation, even with the correct slope, leads to significant underestimation of distances which is not negligible. A correction for this bias is difficult as long as the completeness of the sample is not perfectly well established.

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