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

Journal Article · Sat Jul 01 04:00:00 EDT 1989 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/167592· OSTI ID:5398368

Stauffer, J; Hartmann, L W; Jones, B F; Mcnamara, B R ^[1]

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1. California Univ., Santa Cruz (USA)

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. 33 refs.

• OSTI ID: 5398368
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 342; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION SPECTRA
ABUNDANCE
AGE ESTIMATION
ALKALI METALS
BALMER LINES
ELEMENTS
GRATINGS
LITHIUM
MAIN SEQUENCE STARS
METALS
MOTION
ROTATION
SPECTRA
SPECTROPHOTOMETRY
STAR BURNING
STAR CLUSTERS
STAR EVOLUTION
STARS
VELOCITY