Spectral types in the Orion nebula cluster.
Abstract
MK spectral types of 26 of the brightest cluster members show (1) nine stars with broad hydrogen-line cores, (2) two Am stars, of which one is in the region of the pre-main-sequence stars, (3) two stars with weak K lines similar to ones found in NGC 6475 and M 39, (4) three shell stars, of which one has hydrogen emission, (5) two composite spectra, and (6) no evolved (luminosity class IV or brighter) stars or Ap stars. Key words: open clusters - spectral classification
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- October 1976
- DOI:
- 10.1086/130015
- Bibcode:
- 1976PASP...88..712L