Issue |
A&A
Volume 448, Number 3, March IV 2006
|
|
---|---|---|
Page(s) | 1075 - 1082 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20053936 | |
Published online | 03 March 2006 |
Photopolarimetric activity and circumstellar environment of the young binary system DF Tau
1
Crimean Astrophysical Observatory, Crimea, 334413 Nauchny, Ukraine e-mail: grinin@crao.crimea.ua
2
Pulkovo Astronomical Observatory, St. Petersburg 198904, Russia e-mail: grinin@vg1723.spb.edu
3
Max-Plank Institute fur Radioastronomie, Bonn, Germany e-mail: weigelt@mpifr-bonn.mpg.de
4
Special Astronomical Observatory, Russia
5
Astronomical Institute, Tashkent, Uzbekistan
Received:
28
July
2005
Accepted:
27
October
2005
We present the results of multi-year photometric and
polarimetric observations of the young binary system DF Tau in the
UBVRI bands, as well as bispectrum speckle interferometric
observations in the H and K bands obtained between 2001 and 2003.
The photometric and polarimetric observations suggest that the
linear polarization of DF Tau does not depend on its brightness,
and the polarization variation has a stochastic character. This
result confirms earlier suggestions about the dominant role of hot
accretion spots in the photometric activity of this star. We argue
that the hot spots are at high latitudes and/or the star rotation
axis is inclined to the line-of-sight. The influence of
circumstellar (CS) dust on the variability is probably small since
the inclination of the primary's CS disk to the line-of-sight is
large.
Using the total mass of the binary system DF Tau from Hartigan &
Kenyon (2003, ApJ, 583, 334),
we calculated new orbital parameters of the system.
The new value of the orbital period ( yr) disagrees with
the photometric cycle of about 40 yr revealed by Lamzin et al.
(2001b, A&A, 372, 922)
from analysis of the historical light curve of this star.
This suggests that this cycle is not caused by the orbital motions
of the binary components, but probably reflects the cyclical
variability of the global magnetic field on the main component.
Key words: techniques: photometric / stars: pre-main sequence / techniques: interferometric / techniques: polarimetric / binaries: general stars: individual: DF Tau
© ESO, 2006
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