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The Secrets of EUVE J2056-17.1

Published online by Cambridge University Press:  12 April 2016

M. Mathioudakis ,
J.J. Drake ,
N. Craig ,
D. Kilkenny ,
J.G. Doyle ,
M. Sirk ,
J. Dupuis ,
A. Fruscione ,
C.A. Christian  and
M.J. Abbott
M. Mathioudakis
Affiliation:
Center for EUV Astrophysics, 2150 Kittredge Street, University of California, Berkeley, CA 94720-5030, USA
J.J. Drake
Affiliation:
Center for EUV Astrophysics, 2150 Kittredge Street, University of California, Berkeley, CA 94720-5030, USA
N. Craig
Affiliation:
Center for EUV Astrophysics, 2150 Kittredge Street, University of California, Berkeley, CA 94720-5030, USA
D. Kilkenny
Affiliation:
South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa
J.G. Doyle
Affiliation:
Armagh Observatory, Armagh BT61 9DG, Northern Ireland
M. Sirk
Affiliation:
Center for EUV Astrophysics, 2150 Kittredge Street, University of California, Berkeley, CA 94720-5030, USA
J. Dupuis
Affiliation:
Center for EUV Astrophysics, 2150 Kittredge Street, University of California, Berkeley, CA 94720-5030, USA
A. Fruscione
Affiliation:
Center for EUV Astrophysics, 2150 Kittredge Street, University of California, Berkeley, CA 94720-5030, USA
C.A. Christian
Affiliation:
Center for EUV Astrophysics, 2150 Kittredge Street, University of California, Berkeley, CA 94720-5030, USA
M.J. Abbott
Affiliation:
Center for EUV Astrophysics, 2150 Kittredge Street, University of California, Berkeley, CA 94720-5030, USA

Abstract

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EUVE J2056-17.1 is one of the brightest sources in the First EUVE Source Catalog with 0.24 counts s−1 in the Deep Survey Lexan/B band. We present optical and EUV results that show this source is one of the most active late-type dwarfs. EUVE observed a large flare with energy in excess of 1035 ergs in its Lexan/B band. The quiescent optical spectrum of the source reveals strong hydrogen Balmer and Ca II H and K emission. A strong Li I 6707 Å line is also present in the spectrum. We have estimated a Li abundance of log N(Li) = 2.5±0.4. The high Li abundance and the high flare activity favors an interpretation where the enhanced Li is sustained by spallation reactions.

Type
XI. Searching for New EUV Sources and Transients
Information
International Astronomical Union Colloquium , Volume 152: Astrophysics in the Extreme Ultraviolet , 1996 , pp. 475 - 479
Copyright
Copyright © Kluwer 1996

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