Other
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91..575h&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 91, March 1986, p. 575-582.
Other
95
Calcium, Emission Spectra, H Lines, K Lines, Pre-Main Sequence Stars, Stellar Spectra, T Tauri Stars, H Alpha Line, Radial Velocity, Stellar Luminosity, Stellar Spectrophotometry
Scientific paper
Stars having the Ca II H, K lines in emission were the object of a search in a large area of the Tau-Aur clouds to about B = 15.0 that led to the rediscovery of essentially all 51 T Tauri stars (TTSs); H, K emission was detected in about 20 other faint red stars, which slit spectrograms and multicolor photometry show to be low luminosity K and M stars with weak H-alpha emission. The location of the H, K emission stars in an H-R diagram shows them to be mixed among the conventional TTSs, so that they appear to be simply TTSs whose H-alpha emission is too faint to be detected by conventional surveys. These results stress the notion that, if initial conditions are similar and if premain sequence ages usually assigned are correct, then emission line intensity does not decay with time in any simple general way.
Herbig George H.
Rydgren Eric A.
Vrba Fred J.
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