Photoelectric search for CP2-stars in open clusters. XII - Alpha Persei, Praesepe and NGC 7243

Details Photoelectric search for CP2-stars in open clusters. XII - Alpha Persei, Praesepe and NGC 7243 Photoelectric search for CP2-stars in open clusters. XII - Alpha Persei, Praesepe and NGC 7243

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26as...71..441m&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 71, no. 3, Dec. 1987, p. 441-448.

Astronomy and Astrophysics

Astrophysics

10

Electrophotometry, Open Clusters, Peculiar Stars, Stellar Spectrophotometry, Beryllium, Praesepe Star Clusters, Shell Stars, Stellar Composition

Scientific paper

Observations of 95 stars in the open clusters Alpha Persei, Praesepe, and NGC 7243 have been performed by Delta-a photometry in order to search for the presence of the 5200-A feature of CP2 (or CP4) stars. Although peculiarity has been claimed for half a dozen stars in Alpha Persei, the photometry detects only the CP4 star (= He-weak) HL 985 among the cluster members. The behavior of 3 Be/shell stars (HL 861, 1164, 904) concerning the 5200-A feature is discussed. Praesepe, by far the oldest cluster in the survey program, presents a very new and special case: 3 stars, previously classified as Am have Delta-a values around 0.020 mag, i.e., they exhibit photometric peculiarity like CP2-stars. Such values are incompatible with preceding results for field and cluster Am-stars (= CP3). These objects deserve further attention both photometrically and spectroscopically. NGC 7243 exhibits an outstanding high frequency of CP2-stars; two certain Delta a-peculiar stars have been found: L 370, already known as peculiar, and the newly identified L 114. Two stars are near the detection level: L 58 and 121. According to Geneva photometry, L 487 is markedly peculiar.

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