Journal Article

A Giant Flare on a T Tauri Star Observed at Millimeter Wavelengths

Ray S. Furuya, Hiroko Shinnaga, Kouichiro Nakanishi, Munetake Momose and Masao Saito

in Publications of the Astronomical Society of Japan

Volume 55, issue 6, pages L83-L87
Published in print December 2003 | ISSN: 0004-6264
Published online December 2003 | e-ISSN: 2053-051X | DOI: https://dx.doi.org/10.1093/pasj/55.6.L83
A Giant Flare on a T Tauri Star Observed at Millimeter Wavelengths

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We have conducted multi-epoch synthesis imaging of [math] and 3 millimeter (mm) continuum emission and near-infrared [math]-band (2.2[math]) imaging of a flare event in 2003 January that occurred on the young stellar object GMR-A, which is suggested to be a weak-line T Tauri star in the Orion cluster. Our mm data showed that the flare activity lasted for at least over 13 days, whereas the [math]-band magnitude did not change during this event. In addition, we have succeeded in detecting short time variations of flux on time scales of 15 minutes. The total energy of the flare is estimated to be [math], which makes it one of the most energetic flares reported to date. Comparing the mm continuum luminosities with reported X-ray luminosities, we conclude that the mm flare was similar in nature to solar and other stellar flares. Our results will be a crucial step toward understanding magnetically induced stellar surface activities in T Tauri stars.

Keywords: radio continuum: stars; stars: flare; stars: individual (GMR-A); stars: pre-main sequence; techniques: interferometric

Journal Article.  2807 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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