Nearly simultaneous optical and infrared photometry of T Tauri stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Infrared Astronomy, Infrared Photometry, Optical Emission Spectroscopy, Stellar Spectra, Stellar Spectrophotometry, T Tauri Stars, Color, Cosmic Dust, Emission Spectra, Infrared Radiation, Late Stars, Line Spectra, Red Shift, Spectral Energy Distribution, Stellar Envelopes, Stellar Luminosity, Stellar Radiation, Ubv Spectra

Scientific paper

Nearly simultaneous UBVri and JHKL photometry is presented for 17 T Tauri and related young stars in the Taurus and NGC 2264 regions. The seven stars in our sample with extremely weak line emission have B - V colors which average about 0.1 bluer than expected from their V - i colors, assuming luminosity class V intrinsic colors and normal reddening. The intrinsic locus of our program stars in the (J - H,H - K) infrared two-color diagram is quite well defined and supports the dust-shell model for the infrared excess. Maximum dust temperatures in the approximate range 1000-1500 K are inferred from the intrinsic locus of our stars in the (H - K,K - L) diagram. Infrared excesses similar to those found in typical T Tauri stars are clearly present in several late-type young stars which have extremely weak emission-line spectra. Some BVri photometry for known T Tauri stars in the southern part of the Taurus complex is also presented.

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