The rotation period of Epsilon Eri from photometry of its starspots

BV photometry at six observatories in 1988/1989 and 1989/1990 shows variability resulting from five starspots which lived 1 or 2 months each, had rotation periods in the range P between 10.0d and 12.3d, and had amplitudes in the range 0.01 m - 0.03 m. From the range in P it was possible to estimate...

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Bibliographic Details
Published in:The Astronomical journal 1991-11, Vol.102 (5), p.1813-1815
Main Authors: Frey, Gary J., Hall, Douglas S., Mattingly, Phil, Robb, Steve, Wood, Jim, Zeigler, Kenneth, Grim, Bruce
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
Normal stars (by class): general or individual
Stars
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Summary:BV photometry at six observatories in 1988/1989 and 1989/1990 shows variability resulting from five starspots which lived 1 or 2 months each, had rotation periods in the range P between 10.0d and 12.3d, and had amplitudes in the range 0.01 m - 0.03 m. From the range in P it was possible to estimate k greater than 0.20 +/- 0.05 for the differential rotation coefficient. Ca II K-line photometry, polarimetry, and earlier photometry reported in the literature has also shown variability with periodicities in the same 10 d -12 d range.
ISSN:0004-6256
1538-3881
DOI:10.1086/116005