Photometry of the open cluster NGC 6996 in the North America nebula

Details Photometry of the open cluster NGC 6996 in the North America nebula Photometry of the open cluster NGC 6996 in the North America nebula

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.173..309z&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 173, no. 2, Nov. 1990, p. 309-314.

Astronomy and Astrophysics

Astrophysics

2

Galactic Clusters, Interstellar Extinction, Nebulae, Astronomical Maps, Astronomical Photometry

Scientific paper

Thirty stars in the direction of the open cluster NGC 6996 are measured in the Vilnius photometric system. Photometric spectral types, absolute magnitudes, interstellar reddenings, extinctions, and distances are determined for most of them. Fifteen stars are suspected to be cluster members. Their mean distance is 620 + or - 30 pc and mean extinction A(v) is 1.74 mag. The extinction within the cluster is variable. The age of the cluster is of the order of 100 million yr, and this excludes the possibility that it is evolutionary related with the North America and Pelican Nebulae complex. The distance of this complex 550 pc is confirmed.

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