On the distance of the giant spiral galaxy M 101

Details On the distance of the giant spiral galaxy M 101 On the distance of the giant spiral galaxy M 101

Mar 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....83..354c&link_type=abstract

Astronomy and Astrophysics, vol. 83, no. 3, Mar. 1980, p. 354-362. Research supported by the Consiglio Nazionale delle Ricerche

Astronomy and Astrophysics

Astrophysics

8

Astrometry, Distance, Spiral Galaxies, Cepheid Variables, H Ii Regions, Hydrogen Ions, Novae, Stellar Luminosity, Supernovae

Scientific paper

Calculations of the distance to the giant Sc galaxy M 101 are presented based on H II regions, angular sizes, brightest blue stars, cepheids, novae, supernovae, and luminosity-class calibrations. A mean value of 28.8 + or - 0.5 mag was determined, which is found to be inconsistent with the findings of Sandage and Tammann. It is concluded that the existence of the M 101 group of galaxies proposed by Sandage and Tammann, for use as secondary indicators, is questionable and their mean value is likely to be the upper limit of a wide interval of possible distances.

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