A spectroscopic and statistical study of Collinder 140

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Spectroscopy, Spectrum Analysis, Star Clusters, Statistical Analysis, Stellar Spectra, A Stars, B Stars, Data Processing, Giant Stars, Hertzsprung-Russell Diagram, Interstellar Extinction, Open Clusters, Stellar Magnitude, Ubv Spectra

Scientific paper

Results of a spectroscopic and statistical study of 140 stars in a 1.36 sq deg area surrounding the extended open cluster Collinder 140 and in two neighboring fields are presented. Stars were classified in the MK system based on prism and slit spectra to a completeness limit of V = 14.35 - 0.65 S, where S is a numerical representation of spectral class. A statistically significant H-R diagram of Cr 140 is obtained by the subtraction of the H-R diagrams of the neighboring field stars, and it is shown that most cluster members are of type B9 or earlier, between A0 and A4 with V less than or equal to 10.3 or between F8 and K4 with V less than 7.2 + 0.65 S, with a well-defined main sequence down to A3 and a significant number of F8 to K4 giants. The H-R diagram, B-V and U-V colors and membership properties of the cluster are then used to estimate a distance of 410 + or - 30 pc and an age of 20 + or - 6 Myr for the cluster. The presence of a significant concentration of yellow giants in the cluster is pointed out, and proper motion and radial velocity studies are suggested as a means of confirming the cluster membership of the evolutionarily anomalous group.

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