Pre-main-sequence stars in the young cluster IC 2391

Details Pre-main-sequence stars in the young cluster IC 2391 Pre-main-sequence stars in the young cluster IC 2391

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...342..285s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 342, July 1, 1989, p. 285-294.

Other

64

Open Clusters, Pre-Main Sequence Stars, Stellar Evolution, Stellar Spectrophotometry, Absorption Spectra, Abundance, Color-Magnitude Diagram, Echelle Gratings, H Alpha Line, Lithium

Scientific paper

Seven or eight new, late-type members of the poor open cluster IC 2391 are identified, and membership is confirmed for two other stars. The new members fall approximately along a 3 x 10 to the 7th yr isochrone, which is the age estimated for the cluster on the basis of it super main-seqence turnoff. Echelle spectra were obtained for the most probable cluster members. Most show H-alpha in emission and a strong Li 6707 A absorption line, and a few are rapid rotators. The Li abundances for cluster stars cooler than the sun are considerably less than the primordial Li abundance, providing the first direct evidence for substantial premain-sequence Li burning. The rotational velocities show a range from about 15 to 150 km/s, with a distribution of rotational velocities not significantly different from that observed for low-mass stars in the Pleiades.

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