Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26as...52...27b&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 52, April 1983, p. 27-36.
Astronomy and Astrophysics
Astrophysics
5
Astronomical Photometry, Interstellar Extinction, Open Clusters, Supergiant Stars, Ubv Spectra, Distance, Stellar Color, Stellar Magnitude
Scientific paper
The light of many stars in Tr 27 is strongly attenuated by a foreground dark cloud. Employing UBV, RI and JHKLM data of 3 stars with known spectral types, the ratio of total to selective extinction of the foreground dark cloud was determined by means of the colour-difference method; the result is RJ = 3.2 ± 0.2, equivalent to RW = 3.3 ± 0.2 in the Walraven photometric system. The authors use this value and photometric data on the Walraven system for the determination of the distance of Tr 27 and obtain r = 1.65 ± 0.25 kpc. From the turn-off point of the cluster main sequence the age of the cluster is estimated to be ≡107 yr. The absolute magnitude of several interesting members of the cluster is discussed.
Bakker R.
Thé Pik-Sin
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