Spectra of the two brightest objects in the amorphous galaxy NGC 1569 - Superluminous young star clusters-or stars in a nearby peculiar galaxy?

Details Spectra of the two brightest objects in the amorphous galaxy NGC 1569 - Superluminous young star clusters-or stars in a nearby peculiar galaxy? Spectra of the two brightest objects in the amorphous galaxy NGC 1569 - Superluminous young star clusters-or stars in a nearby peculiar galaxy?

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90.1163a&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 90, July 1985, p. 1163-1171.

Astronomy and Astrophysics

Astronomy

109

Astronomical Photometry, Early Stars, Galactic Structure, Peculiar Galaxies, Star Clusters, Stellar Spectra, Balmer Series, Double Stars, Line Spectra, Radial Velocity, Stellar Luminosity

Scientific paper

Spectra with a resolution of ≡2 Å of the two bright, concentrated objects near the center of the peculiar galaxy NGC 1569 appear stellar. The spectral types and luminosity class are well matched to MK standards at ≡A0 Iab for object A and ≡A2 Iab for object B. The data can be explained by the addition of light of type ≡B0 to the type-A absorption spectrum. The distance to NGC 1569 is not independently known except for resolution into numerous blue stars at B = 20.2. Arguments are given for adopting m-M ≅ 29 for the distance, making objects A and B aggregates of very young stars (star clusters) of integrated luminosity MB ≅ -13 and minimum mass of ≡104. The objects would then be unique and by far the brightest star clusters yet found. The alternative of placing NGC 1569 at m-M ≈ 23 or closer and thus making particularly object A a double star with the high-temperature companion is discussed.

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