Spectral Classification and DDO Photometry of a Southern Group of Stars with Common Motions - Part One

Details Spectral Classification and DDO Photometry of a Southern Group of Stars with Common Motions - Part One Spectral Classification and DDO Photometry of a Southern Group of Stars with Common Motions - Part One

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pasp...94..304l&link_type=abstract

Publications of the Astronomical Society of the Pacific, Vol. 94, P. 304, 1982

Astronomy and Astrophysics

Astronomy

6

Scientific paper

Results of a spectroscopic and photometric study are presented for a group of southern stars with common proper motions. Many groups have been selected from the Yale Zones since their publications. A number of stars in these zones were identified previously as group members of the Hyades, 61 Cyg, Pleiades, Sirius, Scorpius-Centaurus, and Ara associations. The nature of these common-motion groups has not yet been investigated.
This paper is the first report on one of four larger groups selected for a pilot study. This group contains 95 stars for which the observations consisting of image-tube spectra and DDO photometry are completed. From the analyses of the observational data (the DDO color-color diagrams, luminosity, and spectra H-R diagrams) they show a Population I main sequence with a small giant branch. The distribution of δCN(0.04) indicates that this group of stars have CN abundances similar to a galactic cluster such as M67.
The mean spectroscopic parallax yields a distance of approximately 85 pc which is in reasonable agreement with the twelve available trigonometric parallaxes whose average distance is 70.8 pc. The transformed V and (B - V) indices from the DDO photometry are obtained. The comparison between the observed and transformed V and (B - V) is also carried out. Results reported here are limited to spectroscopic and photometric analyses. Space motions and kinematic properties have not yet been completed.

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