Photometric search for Ap-stars in open cluster. IV - NGC 2287, CR 121, NGC 2422 and supplementary measurements in NGC 1662 and NGC 2516

Details Photometric search for Ap-stars in open cluster. IV - NGC 2287, CR 121, NGC 2422 and supplementary measurements in NGC 1662 and NGC 2516 Photometric search for Ap-stars in open cluster. IV - NGC 2287, CR 121, NGC 2422 and supplementary measurements in NGC 1662 and NGC 2516

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...126...80m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 126, no. 1, Sept. 1983, p. 80-85. Research supported by the European Southern

Astronomy and Astrophysics

Astrophysics

10

A Stars, Astronomical Photometry, Open Clusters, Peculiar Stars, Electrophotometry, Interstellar Extinction

Scientific paper

Additional results are presented concerning the search for Ap-stars in open clusters with the photoelectric peculiarity index Delta-a (Maitzen, 1976). NGC 2287-56, NGC 2422-P3, and NGC 1662-4 are found to be CP2-stars as members in their respective clusters. The findings indicate that HD 51088, which is also peculiar according to its Delta-a value, may be a member of one of the two very young star concentrations previously called Cr 121. It is determined that there is only a small probability for HD 49333 to be a member of NGC 2287, and that HD 49333 is very likely to be a CP4 ( = He weak) star with a Delta-a significant for peculiarity. It was necessary to reject 10 other stars with reported indications of peculiarity as CP2 stars since their Delta-a values were normal. It is concluded that the frequency of peculiar objects is rather low in the actual sample considering the number of CP2 detections.

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