A photoelectric investigation of Ap-stars in open clusters. II - NGC 6475

Details A photoelectric investigation of Ap-stars in open clusters. II - NGC 6475 A photoelectric investigation of Ap-stars in open clusters. II - NGC 6475

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...100....3m&link_type=abstract

Astronomy and Astrophysics, vol. 100, no. 1, July 1981, p. 3-6.

Astronomy and Astrophysics

Astrophysics

24

A Stars, Electrophotometry, Magnetic Stars, Open Clusters, Peculiar Stars, Stellar Spectrophotometry, Abundance, Red Shift, Silicon, Stellar Evolution

Scientific paper

Results are presented of photoelectric study of Ap stars in the old galactic cluster NGC 6475. Photometry was obtained in the y, g1 and g2 filters at the 50-cm ESO telescope on La Silla. Observations confirm the presence of the three silicon stars found by Abt (1975) (K 88, 55 and 59) and reveal the Ap nature of two additional stars, K 23 and K 14. A b-y reddening value of 0.050 is obtained which is somewhat lower than that found by Snowden (1976), due to evolutionary effects and the calibration used. In addition, virtually no variable reddening in the cluster is observed.

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