Coordinated multiwavelength observations of the RS CVn system CF Tuc

Budding, E., Jones, K. L., Slee, O. B. and Watson, L. (1999) Coordinated multiwavelength observations of the RS CVn system CF Tuc. Monthly Notices of the Royal Astronomical Society, 305 4: 966-976. doi:10.1046/j.1365-8711.1999.02503.x

Author Budding, E.
Jones, K. L.
Slee, O. B.
Watson, L.
Title Coordinated multiwavelength observations of the RS CVn system CF Tuc
Journal name Monthly Notices of the Royal Astronomical Society   Check publisher's open access policy
ISSN 0035-8711
Publication date 1999-05-01
Sub-type Article (original research)
DOI 10.1046/j.1365-8711.1999.02503.x
Open Access Status DOI
Volume 305
Issue 4
Start page 966
End page 976
Total pages 11
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Language eng
Abstract The relatively bright eclipsing RS CVn binary CF Tuc was observed in both optical (photometry and spectroscopy) and microwave ranges in a 'multisite, multiwavelength' campaign in 1996. The microwave data, gathered using the Australia Telescope Compact Array,covered slightly more than one complete orbital cycle at 4.8 and 8.64 GHz in one continuous nm. There was also limited coverage at 1.38 and 2.38 GHz. High-dispersion spectroscopy was obtained using the McLellan 1-m telescope and echelle spectrograph at Mt John University Observatory (New Zealand). Supporting photometry came from smaller scale facilities associated with the Royal Astronomical Society of New Zealand (RASNZ), The data show the correlation between microwave signal enhancement and photometric flux diminution (maculation effect) noted previously in similar studies. The spectroscopy also points to the phenomena being related to a very enhanced active region on the secondary star located close to the maculation region. Cross-correlation of the microwave emission data between the 4.8- and 8.64-GHz ranges shows a strong positive correlation, with a significant lag of the 4.8-GHz behind the 8.64-GHz variations. This indicates energized waves propagating through the corona of the K4 subgiant at the electron sound speed. The emitting region may have been eclipsed bye primary star, but such eclipse effects are of marginal significance for the present analysis. An attempt is made to put all the evidence into one coherent picture of the active region.
Keyword Astronomy & Astrophysics
Radio Continuum
Radio Light Curves
Late-type Stars
X-ray Flare
Rotational Modulation
Multifrequency Observations
Active Stars
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Physical Sciences Publications
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Created: Wed, 11 Jun 2008, 00:27:49 EST