Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26as...70..311w&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 70, no. 3, Sept. 1987, p. 311-324.
Astronomy and Astrophysics
Astrophysics
31
Astronomical Photometry, Interstellar Extinction, Star Clusters, Stellar Evolution, Stellar Spectrophotometry, Hydrogen, Near Infrared Radiation, Stellar Luminosity, Stellar Magnitude, Supergiant Stars
Scientific paper
VRI photographic photometry is presented for 258 stars in the region of the cluster Wd1 in Ara together with near-infrared spectrophotometry of the brightest stars. The brightest member stars of the cluster are shown to be of spectral types B2 Ia to M2 Ia, forming a well defined sequence of supergiants with the maximum visual luminosity being reached in classes A2 and G0. One of the stars is of type Be with an extremely extended shell. Weak hydrogen emission can be traced in the spectra of a number of the stars as well as in between the stars. The interstellar absorption is very heavy, reaching A(V) = 10 mag; the surrounding field has an average absorption of about 3 mag. A redetermination of the distance of the cluster leads to a value of about 5 kpc as most likely. The age of the cluster is estimated to about seven million years.
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