Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26as...92..863v&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 92, no. 4, March 1992, p. 863-874.
Astronomy and Astrophysics
Astrophysics
13
Binary Stars, Interstellar Extinction, Open Clusters, Stellar Spectrophotometry, Color-Color Diagram, Stellar Color, Stellar Envelopes, Stellar Magnitude, Ubv Spectra
Scientific paper
This paper reports UBVRI photoelectric photometry of stars lying in the field of the open cluster NGC 6193. Attention is focused onto earlier analysis, which had suggested that in this region both the E(U-B)/E(B-V) excess relation and the extinction law are not standard. But the new data support that both E(U-B)/E(B-V) and the extinction law have values which may be assumed to be the standard ones. It was found that the near-infrared anomalies are related in some cases to binary stars. Single stars also showing near-infrared excess could be explained in terms of circumstellar shell hypothesis. A similar feature is found among stars in the open cluster Tr 16. The cluster age is not greater than 3.1 x 10 exp 6 yr from isochrones computed for models with mass loss and overshooting. The distance obtained is 1410 pc.
Feinstein Alexander
Vázquez Ricardo A.
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