Other
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.201..145h&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 201, Oct. 1982, p. 145-170.
Other
23
Blue Stars, Distance, Galactic Clusters, Luminosity, Magnitude, Calibrating, Cepheid Variables, H Ii Regions
Scientific paper
The Sandage-Tammann (1974) chain of reasoning in the determination of the extragalactic distance scale is carefully reviewed. It is concluded that interstellar obscuration internal to the Local Group is not negligible for the brightest blue stars in those galaxies, and therefore is likely not negligible for similar stars in the NGC 2403 group galaxies. S & A's brightest star correlations are of marginal or nil significance, their calibration of the H II region diameter correlation is wrong in principle, and their dismissal of the systematic separation displayed by the data subsets is not correct. In every calibration, the distance to NGC 2403 itself enters with more than half of the total weight through the other galaxies in its group despite the manifestly superior distance analyses for Local Group galaxies. Thus the whole of S & A's extragalactic distance scale depends heavily upon this one galaxy.
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