X-ray Outburst in Mira A

Details X-ray Outburst in Mira A X-ray Outburst in Mira A

2005-03-02

arxiv.org/abs/astro-ph/0503050v1

Astrophys.J. 623 (2005) L137-L140

Astronomy and Astrophysics

Astrophysics

7 pages, 3 figures, to be published in the Astrophysical Journal Letters

Scientific paper

10.1086/430111

We report here the Chandra ACIS-S detection of a bright soft X-ray transient in the Mira AB interacting symbiotic-like binary. We resolved the system for the first time in the X-rays. Using Chandra and HST images we determined that the unprecedented outburst is likely associated with the cool AGB star (Mira A), the prototype of Mira-type variables. X-rays have never before been detected from an AGB star, and the recent activity signals that the system is undergoing dramatic changes. The total X-ray luminosity of the system is several times higher than the luminosity estimated using previous XMM and ROSAT observations. The outburst may be caused by a giant flare in Mira A associated with a mass ejection or a jet, and may have long term consequences on the system.

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