Improved age constraints for the AB Doradus quadruple system
نویسندگان
چکیده
منابع مشابه
The global magnetic topology of AB Doradus
We have used Zeeman-Doppler maps of the surface field of the young, rapid rotator AB Dor (Prot = 0.514 days) to extrapolate the coronal field, assuming it to be potential. We find that the topology of the large-scale field is very similar in all three years for which we have images. The corona divides cleanly into regions of open and closed field. The open field originates in two mid-latitude r...
متن کاملModeling the Corona of Ab Doradus
We present a model for the coronal topology of the active, rapidly rotating K0 dwarf, AB Doradus. Surface magnetic field maps obtained using a technique based on Zeeman Doppler imaging indicate the presence of a strong non-potential component near the pole of the star. The coronal topology is obtained by extrapolating these surface maps. The temperature and density in the corona are evaluated u...
متن کاملSpectroscopic Euve Observations of the Active Star Ab Doradus
We present observations of the pre-Main Sequence, rapidly-rotating (0.515 day) late-type star, AB Doradus (HD 36705), made by the Extreme Ultraviolet Explorer (EUVE) satellite. A high-quality spectrum was accumulated between November 4{11, 1993, with an eeective exposure time of about 40 hours. The data constrain the coronal temperature structure between several 10 4 K up to roughly 210 7 K thr...
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Five and a half years of data from an extensive ROSAT X-ray monitoring program devoted to the young Kstar AB Dor are presented. Begun in mid-1990, this program is aimed at the study of the long-term behaviour of coronal flux levels in this very active star. We compare the X-ray data with 17 years of V-band brightness monitoring that shows a 10-year decline between 1978 and 1989 and a subsequent...
متن کاملMagnetic activity on AB Doradus: Temporal evolution of starspots
Surface brightness maps for the young K0 dwarf AB Doradus are reconstructed from archival data sets for epochs spanning 1988 to 1994. By using the signal-to-noise enhancement technique of Least-Squares Deconvolution, our results show a greatly increased resolution of spot features than obtained in previously published surface brightness reconstructions. These images show that for the exception ...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2006
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20066208