Photoelectric search for CP 2-stars in open clusters. IX - Pleiades and Coma Berenices: The case of PLEIONE

Details Photoelectric search for CP 2-stars in open clusters. IX - Pleiades and Coma Berenices: The case of PLEIONE Photoelectric search for CP 2-stars in open clusters. IX - Pleiades and Coma Berenices: The case of PLEIONE

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...178..313m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 178, no. 1-2, May 1987, p. 313-316.

Astronomy and Astrophysics

Astrophysics

12

Open Clusters, Peculiar Stars, Pleiades Cluster, Stellar Spectrophotometry, Electrophotometry, Metallic Stars

Scientific paper

Δa-photometry for 59 stars in the classical open clusters Pleiades and Coma Berenices covering the whole spectral domain of CP 2-stars is presented. No significant peculiar Δa values could be found for those three objects for which Abt and Levato (1978) claim spectroscopic indications of CP 2-type. The outstanding finding of this investigation is a strongly variable positive (= CP 2-type) Δa-index in the case of the well known shell star Pleione in a time interval of nearly two years. Coma Berenices is unreddened and served therefore as reference for the normality line in the Δa-photometry. Both well known CP 2-stars, 17 Com and 21 Com are confirmed, one metallic line star (Tr 62) shows a Δa-index at the detection limit for CP 2-stars. The other metallic line stars show normal behaviour in the Δa-index. One spectroscopically detected CP 2 nonmember star (Tr 166 = HD 109030) in the area of the cluster has been confirmed by its Δa-index as peculiar.

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