Colour excess and stellar distribution in five selected directions of the Milky Way in Carina, Crux, Centaurus and Norma

Details Colour excess and stellar distribution in five selected directions of the Milky Way in Carina, Crux, Centaurus and Norma Colour excess and stellar distribution in five selected directions of the Milky Way in Carina, Crux, Centaurus and Norma

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26as...41...43j&link_type=abstract

Astronomy and Astrophysics Supplement Series, vol. 41, July 1980, p. 43-66. Research supported by the European Southern Observa

Astronomy and Astrophysics

Astrophysics

7

Galactic Clusters, Galactic Structure, Interstellar Extinction, Milky Way Galaxy, Star Distribution, Stellar Spectra, Astronomical Maps, Astronomical Photometry, Centaurus Constellation, Early Stars, Electrophotometers, Galactic Evolution, O Stars, Spectrum Analysis, Stellar Luminosity, Tables (Data), Ubv Spectra

Scientific paper

Five fields with diameters ranging from 0°.5 to 1°.0 and situated close to the galactic equator in the galactic longitude interval 290° to 330° have been investigated with respect to interstellar reddening and stellar distribution. In total 1087 stars brighter than about B = 13m have been photoelectrically observed in UBV and classified on objective prism plates or by means of two-colour diagrams. Their individual spectro-photometric distances have been determined and used in the analysis.
Most of the reddening occurs within 0.8 kpc from the Sun, with a colour excess of 0m.3 in B-V. In two of the fields (in Carina and Crux) there is no additional reddening out to 4 kpc.
The numbers of early type stars decrease with the galactic longitude in the interval studied, with no OB stars in Norma, where on the other hand the richness in A-F stars is striking.
Eight clusters have been investigated, one of them previously unknown, and their mean colour excesses, distances, earliest spectral types and other parameters have been determined.

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