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Zs. Kőovári J. Bartus M. Švanda K. Vida K.G. Strassmeier K. Oláh E. Forgács-Dajka 《Astronomische Nachrichten》2007,328(10):1081-1083
We demonstrate the power of the local correlation tracking technique on stellar data for the first time. We recover the spot migration pattern of the long-period RS CVn-type binary σ Gem from a set of six Doppler images from 3.6 consecutive rotation cycles. The resulting surface flow map suggests a weak anti-solar differential rotation with α ≈ –0.0022 ± 0.0016, and a coherent poleward spot migration with an average velocity of 220 ± 10ms-1. This result agrees with our recent findings from another study and could also be confirmed theoretically. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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J.M. Benkő 《Astrophysics and Space Science》2000,271(1):73-81
UX Vir has been classified as an RRab star with the period of P =0.d51286 on the basis of new V(RI)
C CCD photometry. A new variable star has also been discovered in the neighbourhood of UX Vir, which is most probably a flare
star. The positions, reddening and distances have also been derived.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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Gyula M. Szabó Giannantonio Milani Carlo Vinante Rolando Ligustri Giovanni Sostero Roberto Trabatti 《Earth, Moon, and Planets》2010,107(2-4):253-265
We have launched the Cometary Archives for Amateur Astronomers, CARA, aiming at coordinated collection of homogeneous, long-time based, continuous data set of bright comet observations. The project is based on a collaboration between professional and amateur astronomers. The archived quantity is a set of the photometric Afρ, measured in I, R or red continuum 647/10 nm filters. To derive coma profiles, Afρ is measured in at least different radii selected from a set of 50,000, 25,000, 12,500, 6,000 and 3,000 km. The data are free to download for registered users, special requests are available upon personal contact. We also provide aspecific code with a tutorial for the aperture photrometry of comets. The purpose of this paper is to introduce the observing methods, tools, software supports and web resources of project CARA. 相似文献
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