Abstract
The spatial association and evolution of photospheric and chromospheric active regions, on the Sun, traces the emersion of magnetic flux tubes. We show that atmospheric phenomena observed in solar-like stars can be interpreted in terms of solar structures, once we have ascertained how detailed solar surface structures do manifest observing the Sun as a star.
Low and high resolution Ha spectroscopy is being performed concurrently with the systematic photometric monitoring of active RS CVn binaries at Catania Observatory, to investigate the active regions evolution at photospheric and chromospheric levels, with cycle, rotation rate and stellar parameters. Preliminary results on the photometric and Ha monitoring of some active binaries, here reported, show that the rotational modulation of the Ha emission is sometime lost, but, whenever present it is always in anti-phase with the photometric wave. We also find evidence that spots generally lead chromospheric plages by about 30–50°.
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References
Bonanno G., Di Benedetto R. (1990) Publ. of Astron. Society of Pacific 102, p. 835
Bopp B.W., Talcott J.C. (1978) Astronomical Journal 83, p. 1517
Bradstreet D.H. (1993) Binary Maker 2.0 User Manual, Contact Software
Brown G.M. and Evans D.R. (1980) Solar Phys. 66 p. 233
Brunner-Hagger, W. (1944) Publ. Zürich Obs. 8 p. 31
Byrne P.B., Agnew D.J., Cutispoto G., Kilkenny D.W., Neff J.E., Panagi P.M., (1992) in 698 Surface Inhomogeneities on Late-Type Stars P.B. Byrne & D.J. Mullan eds., Springer Verlag, Berlin, p. 255
Catalano S., Rodonb M., Frasca A., Cutispoto G. (1996) in Stellar Surface Structure, IAU Symposium No. 176, K. G. Strassmeier and J. L. Linsky eds. Kluver Academic Publisher, Dordrecht, p. 403
Catalano S., Lanza A.F., Brekke P., Rottman G.J., Hoyng P. (1998), in Cool Stars,Stellar System and the Sun, 10th Cambridge Cool star Workshop, R.A. Donahue and J.A. Bookbinder eds., ASP Conf Ser vol. 154, p. 584
Chapman G.A., Coockson A.M., and Dobias J.J. (1997) Astrophysical Journal 482, p. 541
Dobson-Hockey A.K. & Radick R.R. (1986), in Cool Stars,Stellar System and the Sun, Fourth Cambridge Cool star Workshop, M. Zeilik and D.M. Gibson eds. Spring-Verlag, Berlin, p. 202
Doyle J.G., Byrne P.B., Van den Oord G.H.J. (1989) Astronomy and Astrophysics 224, p. 153
Eker Z., Doherty L.R., (1987) Monthly Not. of the Royal Astron. Society 228, p. 869
Fraquelli D.A. (1984) Astrophysical Journal 276, p. 243
Frasca A., Catalano S. (1994) Astronomy and Astrophysics 284,p. 883
Huenemoerder D P., Ramsey L.W. (1984) Astronomical Journal 89, p. 549
Rodonb et al. (1987) Astronomy and Astrophysics 176,p. 267
Ramsey L.W. and Nation H.L. (1984) Astronomical Journal 89, p. 115
Rotman G.J., Woods T.N., Sparn T.P. (1993) Journal Geophys Res. 98 p. 10667
Sanfilippo D. (1993) Tesi di Laurea, Università degli Studi di Catania
Sheeley N.R. (1964), Astrophysical Journal 140, p. 731
Zhai D.S. et al. (1994) Astronomy and Astrophysics 282, p. 168
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© 2000 Springer Science+Business Media Dordrecht
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Catalano, S. et al. (2000). Hα Line and Photometric Variability in Magnetically Active Stars. In: İbanoğlu, C. (eds) Variable Stars as Essential Astrophysical Tools. NATO Science Series, vol 544. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4299-1_39
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DOI: https://doi.org/10.1007/978-94-011-4299-1_39
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