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Astron. Astrophys. 349, L65-L68 (1999)

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Letter to the Editor

Veiling derivation from high to low resolution spectra of T Tauri stars

Alain Chelli

Laboratoire d'Astrophysique, Observatoire de Grenoble, B.P. 53X, F-38041 Grenoble Cedex, France

Received 2 July 1999 / Accepted 10 August 1999


We propose a simple and efficient approach to extract the veiling from low resolution spectra (few hundreds) of T Tauri stars. The method is based on a point to point energy balance, over large scale and deep spectral structures, between the T Tauri spectrum and a template spectrum. We validate the new algorithm, with derivations of the veiling in quasi-simultaneous high resolution ([FORMULA]10000) and low resolution spectra ([FORMULA]300) of the Classical T Tauri star BP Tau. For this half veiled object the results coincides within 10%. The low resolution approach is a powerful tool which makes it possible to study variability problems in T Tauri stars, related to e.g. flare or accretion activity, in timescales as short as minutes.

Key words: methods: data analysis – techniques: spectroscopic – stars: pre-main sequence – accretion, accretion disks

Send offprint requests to: Alain Chelli

© European Southern Observatory (ESO) 1999

Online publication: September 13, 1999