The galactic unclassified B(e) star HD 50138 ??? II. Interferometric constraints on the close circumstellar environment

  title={The galactic unclassified B(e) star HD 50138 ??? II. Interferometric constraints on the close circumstellar environment},
  author={Marcelo Borges Fernandes and Anthony Meilland and Philippe P. Bendjoya and Armando Domiciano de Souza and Gilles Niccolini and Olivier Chesneau and Florentin A. Millour and Alain Spang and P Stee and Michaela Kraus Observatorio Nacional and Brazil. and Fizeau and France. and Mpifr and H Germany and Astronomicky ustav Ondrejov and Czech Republic},
  journal={Astronomy and Astrophysics},
Context. HD 50138 is a southern star that presents the B[e] phenomenon, but its evolutionary stage is still not well known. This object presents spectral variability, which can be explained by outbursts or shell phases. Spectropolarimetric observations have shown the presence of a non-spherically symmetric circumstellar environment that is responsible for the B[e] phenomenon. However, up to now, the structure of the circumstellar medium of this object has not been studied deeply. Aims. Based on… Expand

Figures and Tables from this paper

The Galactic unclassified B[e] star HD 50138 - III. The short-term line profile variability of its photospheric lines
Context. HD 50138 presents the B[e] phenomenon, but its nature is not clear yet. This star is known to present spectral variations, which have been associated with outbursts and shell phases. Aims.Expand
Time-dependent spectral-feature variations of stars displaying the B[e] phenomenon - III. HD 50138
Context. B[e] stars are anomalous objects around which extended circumstellar matter is present. The observed properties of the central star are significantly affected by the surrounding material.Expand
Dust evolution in the circumstellar disc of the unclassified B[e] star HD 50138
We studied the disc of the unclassified B[e] star HD 50138, in order to explore its structure, and to find indications for the evolutionary status of this system, whether it is a young Herbig Be or aExpand
The circumstellar environment of HD50138 revealed by VLTI/AMBER at high angular resolution
HD50138 is a Herbig B[e] star with a circumstellar disc detected at IR and mm wavelength. Its brightness makes it a good candidate for NIR interferometry observations. We aim to resolve, spatiallyExpand
A resolved, au-scale gas disk around the B[e] star HD 50138
HD 50138 is a B[e] star surrounded by a large amount of circumstellar gas and dust. Its spectrum shows characteristics which may indicate either a pre- or a post-main-sequence system. Mapping theExpand
A disk asymmetry in motion around the B[e] star MWC158
MWC158 is a star with the B[e] phenomenon that shows strong spectrophotometric variability (in lines and in UV and visible continuum) attributed to phases of shell ejection. The evolutionary stage ofExpand
First spectro-interferometric survey of Be stars I. Observations and constraints on the disk geometry and kinematics
Context. Classical Be stars are hot non-supergiant stars surrounded by a gaseous circumstellar disk that is responsible for the observed infrared-excess and emission lines. The phenomena involved inExpand
The study of unclassified B[e] stars and candidates in the Galaxy and Magellanic Clouds†
We investigated 12 unclassified B[e] stars or candidates, 8 from the Galaxy, 2 from the Large Magellanic Cloud (LMC) and 2 from the Small Magellanic Cloud (SMC). Based on the analysis ofExpand
Evolutionary status of isolated B[e] stars
Aims. We study a sample of eight B[e] stars with uncertain evolutionary status to shed light on the origin of their circumstellar dust. Methods. We performed a diagnostic analysis on the spectralExpand
Velocity resolved [O I] 63 $\mu$m emission in the HD 50138 circumstellar disk
HH 50138 is one of the brightest B[e] stars at a distance of $\sim$ 380 pc with strong infrared excess. The star was observed in [O I] 63 $\mu$m and [C II] 158 $\mu$m with high velocity resolutionExpand


The galactic unclassified B[e] star HD 50138 - I. A possible new shell phase
Context. The observed spectral variation of HD 50138 has led different authors to classify it in a very wide range of spectral types and luminosity classes (from B5 to A0 and III to Ia) and atExpand
Resolving the dusty circumstellar environment of the A[e] supergiant HD 62623 with the VLTI/MIDI
B[e] stars are hot stars surrounded by circumstellar gas and dust responsible for the presence of emission lines and IR-excess in their spectra. How dust can be formed in this highly illuminated andExpand
Hα spectropolarimetry of B[e] and Herbig Be stars
We present the results of medium resolution (�v� 60 km s 1 ) spectropolarimetric observations across Hof a sample of B(e) and Herbig Be objects. A change in linear polarization across His detected inExpand
The flared inner disk of the Herbig Ae star AB Aurigae revealed by VLTI/MIDI in the N-band
Aims. We aim at using the long baselines of the VLT Interferometer and the mid-IR combiner MIDI (8-13 μm) to derive the morphology of the protoplanetary disk surrounding the Herbig Ae star AB AurigaeExpand
A binary engine fuelling HD87643' s complex circumstellar environment, using AMBER/VLTI
Context. The star HD 87643, exhibiting the "B[e] phenomenon", has one of the most extreme infrared excesses for this object class. It harbours a large amount of both hot and cold dust, and isExpand
Mid-infrared sizes of circumstellar disks around Herbig Ae/Be stars measured with MIDI on the VLTI
We present the first long baseline mid-infrared interferometric observations of the circumstellar disks surrounding Herbig Ae/Be stars. The observations were obtained using the mid-infraredExpand
The First Ultraviolet and Optical Spectropolarimetry of the B[e] Star HD 50138
We report the first ultraviolet spectropolarimetry of the B[e] star HD 50138, obtained with the Wisconsin Ultraviolet Photo-Polarimeter Experiment aboard the Astro-2 Space Shuttle mission in 1995Expand
Mid-infrared size survey of young stellar objects : description of keck segment-tilting experiment and basic results
The mid-infrared properties of pre-planetary disks are sensitive to the temperature and flaring profiles of disks for the regions where planet formation is expected to occur. In order to constrainExpand
AMBER/VLTI and MIDI/VLTI spectro-interferometric observations of the B[e] supergiant CPD-57°2874 . Size and geometry of the circumstellar envelope in the near- and mid-IR
We present the first high spatial and spectral observations of the circumstellar envelope (CSE) of a B[e] supergiant (CPD-5't' 2874), performed with the Very Large Telescope Interferometer (VLTI).Expand
BCD spectrophotometry of stars with the B[e] phenomenon. I. Fundamental parameters
Low resolution spectra in the $\lambda\lambda3500{-}4600$ Awavelength range of 23 stars with the B[e] phenomenon are presented. Spectral classification of 15 program stars was performed using the BCDExpand