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A giant X-ray flare from a B9 + Post-T Tauri system detected by EXOSAT

Published online by Cambridge University Press:  27 September 2017

G. Tagliaferri ,
P. Giommi ,
L. Angelini ,
J.P. Osborne  and
R. Pallavicini
G. Tagliaferri
Affiliation:
EXOSAT Observatory, Astrophysics Division, Space Science Department of ESA, ESTEC, The Netherlands
P. Giommi
Affiliation:
EXOSAT Observatory, Astrophysics Division, Space Science Department of ESA, ESTEC, The Netherlands On leave of absence from: CNR, Istituto di Fisica Cosmica, Milano, Italy
L. Angelini
Affiliation:
EXOSAT Observatory, Astrophysics Division, Space Science Department of ESA, ESTEC, The Netherlands
J.P. Osborne
Affiliation:
EXOSAT Observatory, Astrophysics Division, Space Science Department of ESA, ESTEC, The Netherlands
R. Pallavicini
Affiliation:
Osservatorio Astrofisico di Arcetri, Firenze, Italy

Abstract

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We report the serendipitous discovery by EXOSAT of a flaring X-ray source in the field of the Seyfert type I galaxy III ZW 2. We identify this source with the visual binary HD 560 (B9V + G5Ve) and argue that virtually all of the observed X-ray flux, including the flare, came from its late-type component (HD 560 B). Optical studies have lead to the identification of HD 560 B as a post-T Tauri star. Since these stars are difficult to detect by optical methods, X-ray observations may prove to be the best way to identify them.

Type
Session I: Stellar Flares
Information
International Astronomical Union Colloquium , Volume 104 , Issue 2: Solar and Stellar Flares , 1989 , pp. 131 - 134
Copyright
Copyright © Kluwer 1989

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