Supergiants in the field of the cluster M6, and the distribution of interstellar matter in the direction of the galactic center

Details Supergiants in the field of the cluster M6, and the distribution of interstellar matter in the direction of the galactic center Supergiants in the field of the cluster M6, and the distribution of interstellar matter in the direction of the galactic center

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...218..105w&link_type=abstract

Astrophysical Journal, Part 1, vol. 218, Nov. 15, 1977, p. 105-107, 109 (7 ff.).

Astronomy and Astrophysics

Astronomy

16

Infrared Astronomy, Interstellar Matter, Star Clusters, Supergiant Stars, Astronomical Photometry, Galactic Bulge, Galactic Nuclei, Galactic Structure, Interstellar Extinction, Late Stars, Milky Way Galaxy, Near Infrared Radiation, Open Clusters

Scientific paper

Near-infrared eight-color classification photometry is presented for IRC stars in a field in Scorpius containing the open cluster M6. Distances and extinction values are computed from the photometric spectral types, luminosity classes, and colors. Of the six M stars observed, five are found to be supergiants lying at considerably greater distances than that of the cluster. A comparison of their distances with recent determinations of galactic structure in the direction of the galactic center indicates that the stars are likely to be associated with spiral-arm features approximately 2 and 4 kpc from the sun. This study shows that the dark clouds which produce the rift in the nuclear bulge lie predominantly at a distance of about 1.5 kpc and cause a visual extinction of about 8 mag. This screen of absorbing material is thus seen to be a major component of the Sagittarius arm.

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