Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...318l..69h&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 318, July 15, 1987, p. L69-L72.
Astronomy and Astrophysics
Astrophysics
27
Astrometry, Blue Stars, Brightness, Cosmology, Stellar Luminosity, Supergiant Stars, Astronomical Spectroscopy, Classifying, Distance, H Ii Regions, Standards, Star Clusters
Scientific paper
The authors report the results of spectroscopic observations of the candidate brightest blue supergiants in three nearby spirals, NGC 2403, M81, and M101. The spectra show that many of these "stars" are actually compact H II regions, blue clusters, or composite, not single stars. While not unexpected, these results illustrate additional problems with using the brightest blue stars, whether variable or not, as distance indicators and potential pitfalls in the studies of stellar populations in increasingly distant galaxies.
Aaronson Marc
Humphreys Roberta M.
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