An asymmetry detected in the disk of <ASTROBJ>κ Canis Majoris</ASTROBJ> with AMBER/VLTI
Aims:We study the geometry and kinematics of the circumstellar environment of the Be star κ CMa in the Brγ emission line and its nearby continuum. <BR />Methods: We use the AMBER/VLTI instrument operating in the K band, which provides a spatial resolution of about 6 mas with a spectral resolution of 1500, to study the […]
First direct detection of a Keplerian rotating disk around the Be star α Arae using AMBER/VLTI
Aims:We aim to study the geometry and kinematics of the disk around the Be star α Arae as a function of wavelength, especially across the Brγ emission line. The main purpose of this paper is to understand the nature of the disk rotation around Be stars. <BR />Methods: We use the AMBER/VLTI instrument operating in […]
Disk and wind interaction in the young stellar object <ASTROBJ>MWC 297</ASTROBJ> spatially resolved with AMBER/VLTI
The young stellar object <ASTROBJ>MWC 297</ASTROBJ> is an embedded B1.5Ve star exhibiting strong hydrogen emission lines and a strong near-infrared continuum excess. This object has been observed with the VLT interferometer equipped with the AMBER instrument during its first commissioning run. AMBER/VLTI is currently the only near infrared interferometer that can observe spectrally dispersed visibilities. […]
Be stars: one ring to rule them all?
Aims.We report the theoretical spectral energy distributions (SEDs), Brγ line profiles, and visibilities for two scenarios that can explain the disk dissipation of active hot stars and account for the transition from the Be to the B spectroscopic phase.<BR /> Methods: .We use the SIMECA code to investigate two scenarios, the first one where the […]
First VLTI/MIDI observations of a Be star: Alpha Arae
We present the first VLTI/MIDI observations of the Be star alpha Ara (HD 158 427), showing a nearly unresolved circumstellar disk in the N band. The interferometric measurements made use of the UT1 and UT3 telescopes. The projected baselines were 102 and 74 meters with position angles of 7 ° and 55°, respectively. These measurements […]