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Velocity resolved [O I] 63 μm emission in the HD 50138 circumstellar disk

Sandell, Göran and Salyk, C. and van den Ancker, M. and de Wit, W.-J. and Chambers, E. and Güsten, Rolf and Wiesemeyer, Helmut and Richter, Heiko (2018) Velocity resolved [O I] 63 μm emission in the HD 50138 circumstellar disk. [Other]

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Official URL: https://arxiv.org/abs/1807.09815


HH 50138 is one of the brightest B[e] stars at a distance of ∼ 380 pc with strong infrared excess. The star was observed in [O I] 63 μ m and [C II] 158 μ m with high velocity resolution with upGREAT on SOFIA. The velocity resolved [O I] emission provides evidence for a large gas-disk, ∼ 760 au in size, around HD 50138. Whereas previous interferometric observations give strong evidence for a hot gas and dust disk in Keplerian rotation, our bservations are the first to provide unambiguous evidence for a large warm disk around the star. Herschel/PACS observations showed that the [C II] emission is extended, therefore the [C II] emission most likely originates in an ionized gas shell created by a past outflow event. We confirm the isolated nature of HD 50138. It is far from any star forming region and has low proper motion. Neither is there any sign of a remnant cloud from which it could have formed. The extended disk around the star appears carbon poor. It shows OH and [O I] emission, but no CO. The CO abundance appears to be at least an order of magnitude lower than that of OH. Furthermore 13 CO is enriched by more than a factor of five, confirming that the star is not a Herbig Be star. Finally we note that our high spectral resolution [O I] and [C II] observations provide a very accurate heliocentric velocity of the star, 40.8 ± 0.2 km~s −1 .

Item URL in elib:https://elib.dlr.de/121542/
Document Type:Other
Title:Velocity resolved [O I] 63 μm emission in the HD 50138 circumstellar disk
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Sandell, GöranUniversity of HawaiiUNSPECIFIEDUNSPECIFIED
van den Ancker, M.European Southern ObservatoryUNSPECIFIEDUNSPECIFIED
de Wit, W.-J.European Southern ObservatoryUNSPECIFIEDUNSPECIFIED
Güsten, RolfMax Planck Institut für RadioastronomieUNSPECIFIEDUNSPECIFIED
Wiesemeyer, HelmutMax Planck Institut für RadioastronomieUNSPECIFIEDUNSPECIFIED
Richter, HeikoDLR, Institut für Optische SensorsystemeUNSPECIFIEDUNSPECIFIED
Date:July 2018
Journal or Publication Title:Solar and Stellar Astrophysics (astro-ph.SR); Astrophysics of Galaxies (astro-ph.GA)
Refereed publication:Yes
Open Access:No
Keywords:THz, OI
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Vorhaben Planetary Evolution and Life (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Deposited By: Richter, Dr.rer.nat. Heiko
Deposited On:29 Nov 2018 10:09
Last Modified:29 Nov 2018 10:09

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