Spectral types in the open cluster NGC 6475.
Abstract
Spectral classification of 27 of the brightest cluster members shows (1) an earliest type of B5 IV, (2) a hot Am or Sirius-type star, (3) three Ap stars of the Si or Si-Cr kind, all with weak Ca II K lines, (4) two additional stars with weak K lines, and (5) one "classical" Am star. It is noticed that among the eight spectroscopic binaries in this cluster, the ones with broad lines have normal K-line strengths whereas nearly all of those with sharp lines have weak K lines. Key words: Ap stars - open clusters - Spectral classification
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- June 1975
- DOI:
- 10.1086/129785
- Bibcode:
- 1975PASP...87..417A