Spot Activity and Circumstellar Matter in II Peg

  • C. Lazaro
  • M. J. Arévalo
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 143)


Infrared and V band photometry of the RS CVn system II Peg, carried out in 1984 and 1986, has been analysed with a simple model in order to follow the evolution of the activity of spots over the surface of the visible star. The group of spots has been concentrated in longitude from 1984 to 1986 covering about 27% in 1984 and 44% of the visible disk in 1986. During both observation periods, the system shows an IR excess too high to be attributable to the presence of spots and we suggest it to be caused by dust around the system.


Light Curf Stellar Surface Stellar Disk Normal Star Visible Disk 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Byrne, P.B.: 1986, Inf. Bull. Variable Stars, No 2951Google Scholar
  2. Ferland, G.J.: 1980, Pub. Astron. Soc. Pacific, 92, 526ADSCrossRefGoogle Scholar
  3. IRAS Point Source Catalog: 1985, Explanatory Supplement by Beichman, C.A., Neugebauer, G., Habing, H.J., Clegg, P.E. and Chester T.J., JPL D-1855Google Scholar
  4. Jaschek, M., Jaschek, C. and Egret, D.: 1986, Astron. Astrophys., 158, 325ADSGoogle Scholar
  5. Koorneeff, J.i 1983, Astron. Astrophys., 128, 84ADSGoogle Scholar
  6. Lazaro, C., Arevalo, M.J. and Fuensalida, J.: 1987, Astrophysics and Space Science, 134, 347ADSCrossRefGoogle Scholar
  7. Rucinsky, S.M.: 1977, Pub. Astron. Soc. Pacific, 89,280ADSCrossRefGoogle Scholar
  8. Vogt, S.S.: 1981, Astrophys. J., 247, 975ADSCrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1988

Authors and Affiliations

  • C. Lazaro
    • 1
  • M. J. Arévalo
    • 1
  1. 1.Instituto de Astrofisica de CanariasTenerifeSpain

Personalised recommendations