NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-07-20 T14:09:38 PDT
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For refcode 2003ApJ...582L..83K:
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2003ApJ...582L..83K A New Extragalactic Distance Determination Method Using the Flux-weighted Gravity of Late B and Early A Supergiants Rolf P. Kudritzki, Fabio Bresolin, and Norbert Przybilla Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822; kud@ifa.hawaii.edu; bresolin@ifa.hawaii.edu; norbert@ifa.hawaii.edu Received 2002 October 16; accepted 2002 December 2; published 2002 December 6 ABSTRACT Stellar evolution calculations predict the flux-weighted gravity g/T_eff_^4^ and absolute bolometric magnitude of blue supergiants to be strongly correlated. We use medium-resolution multiobject spectroscopy of late B and early A supergiants in two spiral galaxies, NGC 300 and NGC 3621, to demonstrate the existence of such a relationship, which proves to be surprisingly tight. An analysis of high-resolution spectra of blue supergiants in Local Group galaxies confirms this detection. We discuss the application of the relationship for extragalactic distance determinations and conservatively conclude that once properly calibrated it has the potential to allow for measurements of distance moduli out to 30.5 mag with an accuracy of 0.1 mag or better. Subject headings: galaxies: distances and redshifts - galaxies: stellar content - stars: early-type
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