Bibcode
Lazaro, C.
Bibliographical reference
Astronomy and Astrophysics (ISSN 0004-6361), vol. 193, no. 1-2, March 1988, p. 95-100.
Advertised on:
3
1988
Citations
9
Refereed citations
8
Description
The RS CVn noneclipsing system II Peg has been observed in the J, H, K,
L, and M infrared bands along a complete period. The shape of the light
curve shows an unusual size and concentration of the dark spots in one
of the hemispheres of the star. Photometric spectral type K3 IV is
derived for the unperturbed photosphere and M4 for the dark spots. The
fraction of the visible stellar disk covered by spots amounts to about
44 percent. The IR found excess cannot be accounted for by the presence
of the spots alone, indicating the existence of a circumstellar
contribution which can be attributed, for the first time in a RS CVn
star, to thermal emission from dust around the system. This IR excess
can be fitted by thermal emission from small particles distributed
spatially around the system, with density law 1/r-squared and an
estimated mass not less than 3 x 10 to the -12th solar mass.