Cyclic phenomena in the circumstellar gaseous envelope of the candidate Herbig A0e star HD163296

Details Cyclic phenomena in the circumstellar gaseous envelope of the candidate Herbig A0e star HD163296 Cyclic phenomena in the circumstellar gaseous envelope of the candidate Herbig A0e star HD163296

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26as..127..243b&link_type=abstract

Astronomy and Astrophysics Supplement, v.127, p.243-249

Astronomy and Astrophysics

Astrophysics

14

Line: Profiles, Polarization, Stars: Circumstellar Matter, Stars: Individual (Hd163296), Stars: Mass Loss, Stars: Pre-Main Sequence

Scientific paper

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 Hα , 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 Hα and Hβ were obtained at the ESO (Chile) in 1991-1992. VRI-polarimetry (about forty measurements of the Stokes parameters Q,U,V 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 Hα and Hβ 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. Based on observations collected at the Astrophysical National Laboratory (LNA, Brazil), the European Southern Observatory (ESO, La Silla, Chile) and at the South African Astronomical Observatory (SAAO, South Africa).

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