M supergiants and the distance to M101

Details M supergiants and the distance to M101 M supergiants and the distance to M101

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264..458h&link_type=abstract

Astrophysical Journal, Part 1, vol. 264, Jan. 15, 1983, p. 458-463.

Astronomy and Astrophysics

Astrophysics

20

M Stars, Red Giant Stars, Spiral Galaxies, Star Distribution, Supergiant Stars, Astronomical Photometry, Distance, Stellar Luminosity, Stellar Magnitude

Scientific paper

The authors have identified over 90 candidate M supergiants in the spiral arms of the ScI galaxy M101. The most luminous M supergiants in the sample have an apparent brightness, uncorrected for reddening, of V = 20.9 mag ± 0.2. Adopting the luminosity calibration derived by Humphreys for the brightest M supergiants of MV ≈ -8.0 ± 0.2 gives an apparent distance modulus (m-M)V = 28.9 mag ± 0.3. Estimates of reddening in the region of the candidate M supergiants suggest a true modulus of ≈ 28.6 mag.

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