A spectroscopic and statistical study of Collinder 140.
Abstract
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.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- April 1980
- DOI:
- 10.1093/mnras/191.1.95
- Bibcode:
- 1980MNRAS.191...95F
- Keywords:
-
- 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;
- Astronomy