Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26as...82..319t&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 82, no. 2, Feb. 1990, p. 319-330. Research supported by the
Astronomy and Astrophysics
Astrophysics
24
Hertzsprung-Russell Diagram, Interstellar Extinction, Open Clusters, Astronomical Photometry, Color-Color Diagram, Stellar Evolution, Stellar Luminosity, Stellar Mass
Scientific paper
New measurements in several photometric systems, Johnson U BV, Cousins V RI and near-IR J H K L are presented for stars in the extremely young open cluster NGC 6611. Individual values of R, the ratio of total to selective extinction, were derived for the interstellar material in the direction of the OB-type stars. Many of them are larger than the value usually accepted for the normal interstellar medium (R = 3.1). The log luminosity/solar luminosity vs. log T(eff) diagram is compared with the theoretically calculated one by Maeder (1981), showing that the luminous stars lying close to the top of the main sequence are in the core He burning phase.
de Winter Dolf
Feinstein Alexander
Thé Pik-Sin
Westerlund Bengt E.
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