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Long and short timescale variability of magnetic activity on the BY Dra star BD+26 deg 730BD+26 degree 730 is a very active K5V flare star with a 60 year starspot cycle. Since it is also nearly pole-on, it presents an unusual opportunity to study purely temporal evolution of magnetic activity. Contemporaneous International Ultraviolet Explorer (IUE), magnetic flux, polarimetric, and H alpha observations of the star taken over several rotational periods in 1988 are presented. When combined with older photometry, optical and IUE archive spectra, the data show a surprising lack of any activity variability on either short (few days) or long (years) timescales. The lack of variability is suggested to be due to a nearly saturated level of magnetic activity on the star, as indicated by its large magnetic filling factor.
Document ID
19910008628
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Saar, S. H.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA., United States)
Golub, L.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA., United States)
Bopp, B.
(Toledo Univ. OH., United States)
Herbst, W.
(Wesleyan Univ. Middletown, CT., United States)
Huovelin, J.
(Helsinki Univ. of Technology Espoo, Finland)
Date Acquired
September 6, 2013
Publication Date
August 1, 1990
Publication Information
Publication: ESA, Evolution in Astrophysics: IUE Astronomy in the Era of New Space Missions
Subject Category
Astrophysics
Accession Number
91N17941
Funding Number(s)
CONTRACT_GRANT: NAS5-28731
CONTRACT_GRANT: NASA ORDER W-15130
CONTRACT_GRANT: NAGW-112
Distribution Limits
Public
Copyright
Other
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