Contemporaneous Broad-Band Photometry and Hα Observations of T Tau Stars

• Autorzy: Frasca A. , Montes D. , Alcalá J. M. , Klutsch A. , Guillout P.

Identyfikatory

DOI

0.32023/0001-5237/68.4.5

• Języki publikacji: EN

Abstrakty

EN

In this paper we present the results of a simultaneous BVRI and Hα photometric monitoring, contemporaneous to medium-resolution spectroscopy of six T Tau stars in the Taurus-Auriga star forming region. We have characterized the Hα photometric system using synthetic templates and the contemporaneous spectra of the targets. We show that we can achieve a precision corresponding to 2–3 Å in the Hα equivalent width, in typical observing conditions. The spectral analysis has allowed us to determine the basic stellar parameters and the values of quantities related to the accretion. In particular, we have measured a significant veiling only for the three targets with the strongest Hα emission (T Tau, FM Tau, and DG Tau). The broad-band photometric variations are found to be in the range of 0.05–0.70 mag and are often paired to variations in the Hα intensity, which becomes stronger when the stellar continuum is weaker. In addition, we have mostly observed a redder V-I and a bluer B-V color as the stars become fainter. For most of the targets, the timescales of these variations seem to be longer than the rotation period. One exception is T Tau, for which the broad-band photometry varies with the rotation period. The most plausible interpretation of these photometric and Hα variations is that they are due to non-stationary mass accretion onto the stars, but rotational modulation can play a major role in some cases.

Słowa kluczowe

EN

stars: pre-main sequence; stars: activity; accretion; accretion disks; open clusters and associations: individual: Taurus

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2018
• Tom: Vol. 68, No. 4
• Strony: 403--424
• Opis fizyczny: Bibliogr. 62 poz., tab., wykr.

Twórcy

autor

Frasca A.

• INAF - Osservatorio Astrofisico di Catania, via S. Sofia, 78, I-95123 Catania, Italy

autor

Montes D.

• Departamento de Física de la Tierra y Astrofísica & UPARCOS-UCM (Unidad de Física de Partículas y del Cosmos de la UCM), Facultad de Ciencias Físicas, Universidad Complutense de Madrid, E-28040 Madrid, Spain

autor

Alcalá J. M.

• INAF - Osservatorio Astronomico di Capodimonte, via Moiariello 16, I-80131 Napoli, Italy

autor

Klutsch A.

• INAF - Osservatorio Astrofisico di Catania, via S. Sofia, 78, I-95123 Catania, Italy

autor

Guillout P.

• Universit de Strasbourg, CNRS, Observatoire astronomique de Strasbourg, UMR 7550, F-67000 Strasbourg, France

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).