A search for non-stellar contributions to the optical and near-IR flux of RS CVn binaries

Details A search for non-stellar contributions to the optical and near-IR flux of RS CVn binaries A search for non-stellar contributions to the optical and near-IR flux of RS CVn binaries

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...183...83b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 183, no. 1, Sept. 1987, p. 83-90.

Astronomy and Astrophysics

Astrophysics

14

Binary Stars, Near Infrared Radiation, Spectrophotometry, Stellar Envelopes, Stellar Radiation, Classifications, Dust, Late Stars, Light Curve, Stellar Oscillations, Ubv Spectra

Scientific paper

UBVRIJHK light curves of four active binaries of the RS CVn class are presented together with coordinated spectrophotometric observations in the near infrared (1.4-2.5 μm). Low amplitude time variations in the optical filters are clearly present. They are interpreted as effects of dark spots partially covering the stellar surface. However, the whole spectral distributions (from U to K) of three out of four studied systems (with the exception of TY Pyx) cannot be simply explained by a combination of stellar spectra and of spot-related photospheric perturbations. Moreover, at least in two cases, the data clearly show infrared excesses that cannot be simply explained by classification errors, and seem to require the presence of circumstellar matter. A preliminary analysis suggests that, at least in two systems, thermal radiation from a thin dust shell is likely to explain the data.

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