Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26as..102..343s&link_type=abstract
Astronomy and Astrophysics Supplement, Vol.102, NO. 2/DECI, P. 343, 1993
Astronomy and Astrophysics
Astrophysics
9
Stars: Close Binaries, Polarization, Stars: Circumstellar Matter
Scientific paper
The observed sample of 15 RS CVn binaries contains 6 systems with evidence of circumbinary dust envelopes from an IR excess, and for comparison 6 binaries which do not show any excess, the rest of the objects have an uncertain detection. Four of the binaries, II Peg, DK Dra, GK Hya, and UX Ari were observed with phase coverages sufficient for a second order Fourier analysis. Data for II Peg from 36 nights spanning two observing seasons give evidence for a statistically significant second harmonic in the V band with an amplitude of 0.024±0.007% in the parameter Px. The modulation appears to be stronger (0.042±0.010%) during the first season (1989-90) and to have a decreased amplitude (0.013±0.010%) during the second indicating possible long-term variability. Due to the small number of observations in the R and I bands the detections are less clear. The same is true for the Fourier fits of the other observed binaries. CQ Aur, RZ Eri, and VV Mon are polarized at the 0.20% level (σ ˜ ±0.01%), but the wavelength dependence for these binaries is consistent with interstellar polarization. The mean polarizations for UX Ari and DK Dra are small (0.017±0.010% and 0.032±0.008%, respectively), but show a tendency to increase toward the infrared, which may indicate scattering by large dust particles in optically thin circumstellar material. No correlation between the IR excess and the evidence for intrinsic polarization was found.
Coyne George V.
Elias Nicholas M.
Holenstein Bruce D.
Koch Robert H.
Piirola Vilppu
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