CCD photometric search for peculiar stars in open clusters. V. NGC 2099, NGC 3114, NGC 6204, NGC 6705 and NGC 6756

Abstract

We have investigated 1008 objects in the area of five intermediate age open clusters (NGC 2099, NGC 3114, NGC 6204, NGC 6705 and NGC 6756) via the narrow band Delta a-system. The detection limit for photometric peculiarity is very low (always less than 0.009mag) due to the high number of individual frames used (193 in total). We have detected six peculiar objects in NGC 6705 and NGC 6756 from which one in the latter is almost certainly an unreddened late type foreground star. The remaining five stars are probably cluster members and bona fide chemically peculiar objects (two are lambda Bootis type candidates). Furthermore, we have investigated NGC 3114, a cluster for which already photoelectric Delta a-measurements exist. A comparison of the CCD and photoelectric values shows very good agreement. Again, the high capability of our CCD Delta a-photometric system to sort out true peculiar objects together with additional measurements from broad or intermediate band photometry is demonstrated.

arXiv comment6 pages, 2 figures, accepted by A&A

References in corpus (2)

• The status of Galactic field lambda Bootis stars in the post-Hipparcos era
• Star clusters in the Carina complex: UBVRI photometry of NGC3114, Collinder228 and vdB-Hagen99

Cited by in corpus (7)

• Chemical analysis of giant stars in the young open cluster NGC 3114
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• On the incidence of chemically peculiar stars in the Large Magellanic cloud
• Signature of a chemical spread in the open cluster M37
• New Variable Stars in Open Clusters I: Methods and Results for 20 Open Clusters
• Discovery of lambda Boo stars in open clusters