AAS 197, January 2001
Session 41. Star Clusters and Associations
Display, Tuesday, January 9, 2001, 9:30am-7:00pm, Exhibit Hall

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[41.02] Spectroscopy and Strömgren Photometry in the Young Open Cluster NGC 2169

C.C. Yost, R.O. Gray, L. Murdick, P. Robinson (Appalachian State University)

NGC 2169 is a young (1.5 \times 107 yr) open cluster in Orion with no associated nebulosity. As part of our program of searching for peculiar stars in open clusters, we have obtained classification--resolution (1.8Å/2 pixels) spectra for 23 stars, low--resolution (20Å/2 pixels) spectra for an additional 9 stars, and Strömgren uvby photometry for 40 stars in the field of NGC 2169 down to V ~15.5. The observations were made on the 0.8 meter telescope of Appalachian State University's Dark Sky Observatory. NGC 2169 appears to have very few members later than spectral type A3. However, the Strömgren photometry yields 5 new candidate members of NGC 2169, plus a population of possible but not probable pre--main--sequence stars. The spectroscopy shows that most stars in NGC 2169 are normal, except for two helium--weak B--type stars, and a mild Silicon Bp star. More spectroscopy and photometry is planned in the field.

This project has been partially funded by a small AAS Grant, plus an Undergraduate Research Scholarship from the Graduate School of Appalachian State University to C.C. Yost. We would also like to acknowledge a grant from the Fund for Astrophysical Research.

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