A&A Supplement series, Vol. 127, January II 1998, 243-249
Received February 26; accepted May 13, 1997
N.G.Beskrovnaya
- M.A.Pogodin -
R.V.Yudin
- G.A.P.Franco
- S.L.A. Vieira
- A. Evans
Send offprint request: N.G.Beskrovnaya
Central Astronomical Observatory of the Russian
Academy of Sciences at Pulkovo,
196140 Saint-Petersburg, Russia
e-mail: beskr@pulkovo.spb.su
Departamento de Fısica - ICEX - UFMG, Caixa Postal 702, 30.161-970 -
Belo Horizonte - MG, Brazil
Department of Physics - Keele University, Keele,
Staffordshire ST5 5BG, UK
We present new results of a spectroscopic and polarimetric investigation
of the candidate young Herbig Ae/Be star HD163296. Twenty two spectra
of this object near the 
, HeI 5876 and DNaI lines had been obtained
in 1992-1995 at the Astrophysical National Laboratory of Brazil (LNA).
In addition, forty seven high-resolution
spectra in H
and H
were obtained at the ESO (Chile) in 1991-1992.
-polarimetry (about forty measurements of the Stokes
parameters 
in each passband) were carried out at
the SAAO (South Africa) in July 17-30, 1995.
Striking profile variability has been found in all the lines on time scales
from hours to months. Analysis of the profiles revealed
manifestations of a remote cool shell which is in
active interaction with the variable kinematically stratified
stellar wind. Signs of cyclic positional
variations of the H and H emission peaks were observed during five
nights in July, 1991.
Sinusoidal variations of the linear polarization parameters detected in July, 1995 are explained in the framework of a model involving magnetized gaseous condensation, rotating in the envelope with the period of 15 days.
Marginal detection of circular polarization is also reported.
keywords: line: profiles -- polarization -- stars: circumstellar matter -- stars: individual (HD163296) -- stars: mass loss -- stars: pre-main sequence