Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84...90r&link_type=abstract
Astronomical Journal, vol. 84, Jan. 1979, p. 90-95.
Astronomy and Astrophysics
Astronomy
12
Emission Spectra, H Alpha Line, Late Stars, Stellar Spectrophotometry, Ubv Spectra, Color-Color Diagram, Line Spectra, Main Sequence Stars, Photoelectric Emission, Star Clusters
Scientific paper
UBVRI photometry is given for a sample of 25 late-type H-alpha-emission stars in the young cluster NGC 2264. The stars are in the V magnitude range from 12 to 16. Some but not all appear to be T Tauri stars. The color-color diagrams support the view that the deviations from normal photospheric colors (due to 'spectral veiling' and line emission) decrease with increasing wavelength between the U and I filters. In the (V, V - R) diagram, the H-alpha-emission stars lie in a well-defined pre-main-sequence band. Within this sample, there is a trend toward stronger line emission and spectral veiling with later spectral type. All of the likely legitimate T Tauri stars have inferred spectral types later than about K3. The question of cluster membership for stars in the cluster field with very small proper motions is considered.
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