The compact H$\alpha$ emitting regions of the Herbig Ae/Be stars HD 179218 and HD 141569 from CHARA spectro-interferometry

Abstract

This work presents CHARA/VEGA H$\alpha$ spectro-interferometry (R ~ 6000, and $\lambda$/2B ~ 1 mas) of HD 179218 and HD 141569, doubling the sample of Herbig Ae/Be (HAeBe) stars for which this type of observations is available so far. The observed H$\alpha$ emission is spatially unresolved, indicating that the size of the H$\alpha$ emitting region is smaller than ~ 0.21 and 0.12 au for HD 179218 and HD 141529 (~ 15 and 16 R*, respectively). This is smaller than for the two other HAeBes previously observed with the same instrumentation. Two different scenarios have been explored in order to explain the compact line emitting regions. A hot, several thousand K, blackbody disc is consistent with the observations of HD 179218 and HD 141569. Magnetospheric accretion (MA) is able to reproduce the bulk of the H$\alpha$ emission shown by HD 179218, confirming previous estimates from MA shock modelling with a mass accretion rate of 10^-8 Msun/yr, and an inclination to the line of sight between 30 and 50 degr. The H$\alpha$ profile of HD 141569 cannot be fitted from MA due to the high rotational velocity of this object. Putting the CHARA sample together, a variety of scenarios is required to explain the H$\alpha$ emission in HAeBe stars -compact or extended, discs, accretion, and winds-, in agreement with previous Br$\gamma$ spectro-interferometric observations.

arXiv comment6 pages, 3 figures, 1 table. Accepted in MNRAS

References in corpus (36)

• ISO spectroscopy of circumstellar dust in 14 Herbig Ae/Be systems: towards an understanding of dust processing
• The Circumstellar Disk of HD 141569 Imaged with NICMOS
• A spectroscopic survey of Herbig Ae/Be stars with X-Shooter I: Stellar parameters and accretion rates
• Magnetospheres and Disk Accretion in Herbig Ae/Be Stars
• CO emission from discs around isolated HAeBe and Vega-excess stars
• On the formation of H-alpha line emission around classical T Tauri stars
• Probing the circumstellar structure of Herbig Ae/Be stars
• The origin of hydrogen line emission for five Herbig Ae/Be stars spatially resolved by VLTI/AMBER spectro-interferometry
• Parameters of Herbig Ae/Be and Vega-type stars
• A search for strong, ordered magnetic fields in Herbig Ae/Be stars
• Accretion rates and accretion tracers of Herbig Ae/Be stars
• Temperaments of young stars: Rapid mass-accretion rate changes in T Tauri and Herbig Ae stars
• Spiral Structure when Setting up Pericentre Glow: Possible Giant Planets at Hundreds of AU in the HD141569 Disk
• The structure of the protoplanetary disk surrounding three young intermediate mass stars. II. Spatially resolved dust and gas distribution
• Estimating Be Star Disk Radii using H-alpha Emission Equivalent Widths
• Searching for a link between the magnetic nature and other observed properties of Herbig Ae/Be stars and stars with debris disks
• Accretion-related properties of Herbig Ae/Be stars. Comparison with T Tauris
• Modeling the Halpha line emission around classical T Tauri stars using magnetospheric accretion and disk wind models
• The mass ratio and formation mechanisms of Herbig Ae/Be star binary systems
• Optical spectroscopic variability of Herbig Ae/Be stars
• Diagnosing Mass Flows Around Herbig Ae/Be Stars Using the He I 10830 Line
• Spatially and Spectrally Resolved Hydrogen Gas within 0.1 AU of T Tauri and Herbig Ae/Be Stars
• On the difference between Herbig Ae and Herbig Be stars
• The Structure of Protoplanetary Disks Surrounding Three Young Intermediate Mass Stars. I. Resolving the disk rotation in the [OI] 6300 Åline
• Investigating the flyby scenario for the HD 141569 system
• High-resolution Br-gamma spectro-interferometry of the transitional Herbig Ae/Be star HD 100546: a Keplerian gaseous disc inside the inner rim
• Optical Mass Flow Diagnostics in Herbig Ae/Be Stars
• Discovery of an Inner Disk Component around HD 141569 A
• Probing the wind launching regions of the Herbig Be star HD 58647 with high spectral resolution interferometry
• Observations of Herbig Ae Disks with Nulling Interferometry
• Enhanced Halpha activity at periastron in the young and massive spectroscopic binary HD200775
• Investigating the origin and spectroscopic variability of the near-infrared HI lines in the Herbig star VV Ser
• The H$\alpha$ line forming region of AB Aur spatially resolved at sub-AU with the VEGA/CHARA spectro-interferometer
• A symmetric inner cavity in the HD 141569A transitional disk
• Resolving the ionized wind of the post-Red Supergiant IRC +10 420 with VLTI/AMBER
• Photoionization Models of the Inner Gaseous Disk of the Herbig Be Star BD+65 1637

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• The Discovery of lambda Bootis Stars -- The Southern Survey II
• First MATISSE L-band observations of HD 179218. Is the inner 10 au region rich in carbon dust particles?
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• Photoionization Models for the Inner Gaseous Disks of Herbig Be Stars: Evidence Against Magnetospheric Accretion?
• Reading between the lines: Disk emission, wind, and accretion during the ZCMa NW outburst
• Spectroastrometric Study of Ro-vibrational CO Emission from the Herbig Ae star HD~179218 with iSHELL on the NASA Infrared Telescope Facility
• K-band GRAVITY/VLTI interferometry of "extreme" Herbig Be stars. The size-luminosity relation revisited
• Spectroscopic study of Herbig Ae/Be stars in the Galactic Anti-center region from LAMOST DR5
• An Incipient Debris Disk in the Chamaeleon I Cloud
• UV Spectropolarimetry with Polstar: Protoplanetary Disks
• Kinematic evidence of magnetospheric accretion for Herbig Ae stars with JWST NIRSpec
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