UBV photometry in four southern open clusters with suspected supernova remnants

Astronomy and Astrophysics – Astronomy

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Astronomical Photometry, Open Clusters, Supernova Remnants, Ubv Spectra, Astronomical Photography, Interstellar Extinction, Red Shift, Stellar Evolution

Scientific paper

UBV photoelectric photometry is presented for four southern open clusters with suspected supernova remnants: Stock 14, Trumpler 21, Lynga 1, and Pismis 20. The extinctions and distance moduli for the clusters are determined. It is found that all of the clusters except for Lynga 1 are good candidates for spiral tracers. Rough age estimates for the clusters are made on the basis of postmain sequence turn-offs and supergiant members. The color-magnitude diagrams of the clusters are compared with the age groups of Mermilliod (1981).

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