Ultraviolet and X-ray observations of NGC 2264
An IUE satellite search is reported for chromospheric emission in the UV spectra of the brightest pre-main sequence stars in the open cluster NGC 2264. Einstein X-ray observations to search for variability of the bright O7 V ((f)) star S Mon = W131, which may be the most massive member of the cluster, are also reported. Fifteen cluster members of spectral type B-K, ranging in age from a million to ten million yr, were observed in the ultraviolet. The only star exhibiting chromospheric emission is W79, a faint, heavily veiled T Tauri star that lies below the main sequence of NGC 2264. The observations are consistent with the generally accepted idea that chromospheric activity of late-type stars subsides with age. 54 references.
- Research Organization:
- Hawaii Univ., Honolulu; Colorado Univ., Boulder
- OSTI ID:
- 6061116
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 293; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
CHROMOSPHERE
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
MAIN SEQUENCE STARS
MASS
RADIATIONS
SOLAR ATMOSPHERE
SPECTRA
STAR CLUSTERS
STARS
ULTRAVIOLET SPECTRA
X RADIATION