Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..183s&link_type=abstract
In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 183-186 (SEE N85-20961 1
Astronomy and Astrophysics
Astronomy
Chromosphere, Emission Spectra, Galactic Clusters, Line Spectra, Pre-Main Sequence Stars, Iue, T Tauri Stars, Ultraviolet Astronomy
Scientific paper
Pre-main sequence stars in the galactic cluster NGC 2264 were observed with IUE to search for ultraviolet chromospheric and transition region (TR) emission lines. Fifteen cluster members of spectral type A-K, ranging in age from 1 to 10 million years, and 4 other stars in the direction of the cluster were observed at low resolution. chromospheric emission was detected only in the faint H alpha emission line star NX Mon (W 79); its Mg II surface flux, FMg is approximately = to 1 x 10 to the 9th power ergs/sq cm/s, is comparable to that observed for very active T Tauri stars. Upper limits on chromospheric and TR line emission of the remaining stars are comparable to the emission line strengths of solar-type stars in the Hyades and UMa clusters and of the youngest field stars. The bright pre-main sequence stars in NGC 2264 therefore have weaker chromospheres and TRs than do the T tau stars, but it is uncertain whether their activity levels are intermediate between those of the T Tau and older stars.
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