Surface brightness fluctuations - A bridge from M31 to the Hubble constant

Details Surface brightness fluctuations - A bridge from M31 to the Hubble constant Surface brightness fluctuations - A bridge from M31 to the Hubble constant

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...373l...1t&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 373, May 20, 1991, p. L1-L4.

Other

197

Andromeda Galaxy, Brightness Distribution, Galactic Clusters, Hubble Constant, Color-Magnitude Diagram, Cool Stars, Metallicity, Stellar Luminosity

Scientific paper

Observations of the I-band surface-brightness fluctuations of M32, M31, NGC 205, and other galaxies in the Fornax and Eridanus clusters are discussed. It is confirmed that M-bar(I) has a small scatter; however, a calibration substantially different from a work based on theoretical isochrones is determined. This is attributed to the isochrones underestimating the I-band bolometric corrections in very cool luminous stars of solar metallicity. A value of the Hubble constant of 82 + or - 7 km/s Mpc is derived, and it is pointed out that the agreement between this value and that given in a previous study reflects the fact that the M31 calibration of fluctuation absolute luminosity yields results identical to IRTF calibrations.

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