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Letter to the Editor
Veiling derivation from high to low resolution spectra of T Tauri stars
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 (10000) and low resolution spectra (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
Online publication: September 13, 1999