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A Search for Rotational Modulation in the EUV Emission from AB Doradus

Published online by Cambridge University Press:  12 April 2016

S.M. White ,
J. Lim ,
S.M. Rucinski ,
G. Roberts ,
D. Kilkenny ,
S.G. Ryan ,
P. Prado  and
M.R. Kundu
S.M. White
Affiliation:
Dept. of Astronomy, Univ. of Maryland, College Park MD 20742, USA
J. Lim
Affiliation:
IAA, Academica Sinica, PO Box 1-87, Nankang, Taipei, Taiwan
S.M. Rucinski
Affiliation:
Inst. for Space and Terr. Science, andYork Univ., 4850 Keele St., Toronto, Ontario M3J 3K1, Canada
G. Roberts
Affiliation:
South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa
D. Kilkenny
Affiliation:
South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa
S.G. Ryan
Affiliation:
Anglo-Australian Observatory, PO Box 296, Epping NSW 2121, UK
P. Prado
Affiliation:
Las Campanas Observatory Casilla 601, La Serena, Chile
M.R. Kundu
Affiliation:
Dept. of Astronomy, Univ. of Maryland, College Park MD 20742, USA

Abstract

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One of the goals of the EUVE observation of AB Doradus was to search for rotational modulation of the EUV emissions. In support of this goal we carried out optical photometry in Chile, Australia and South Africa and radio observations in Australia. In addition, an ASCA observation of AB Dor was scheduled to occur during the campaign. Several spectacular X-ray and optical flares with accompanying brightening in the EUV were seen, but no rotational modulation of the EUV emission was evident, except for a dip in the He II 304 Å line coincident with the optical minimum. An X-ray flare was seen with no accompanying EUV flare.

Type
III. Coronae of Cool Stars
Information
International Astronomical Union Colloquium , Volume 152: Astrophysics in the Extreme Ultraviolet , 1996 , pp. 165 - 169
Copyright
Copyright © Kluwer 1996

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