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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 742649.0, MPI für Astronomie / Publikationen_mpia
Herschel observations of the circumstellar environments of the Herbig Be stars R Mon and PDS 27
Authors:Jiménez-Donaire, M. J.; Meeus, G.; Karska, A.; Montesinos, B.; Bouwman, J.; Eiroa, C.; Henning, T.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:Astronomy and Astrophysics
Start Page:id. A62 (12 pp)
Audience:Not Specified
Abstract / Description:Context. The circumstellar environments of Herbig Be stars in the far-infrared are poorly characterised, mainly because they are often embedded and rather distant. The analysis of far-infrared spectroscopy allows us to make a major step forward by covering multiple rotational lines of molecules, e.g. CO, that are useful probes of the physical conditions of the gas. <BR /> Aims: We characterise the gas and dust in the discs and environments of Herbig Be stars, and we compare the results with those of their lower-mass counterparts, the Herbig Ae stars. <BR /> Methods: We report and analyse far-infrared observations of two Herbig Be stars, R Mon and PDS 27, obtained with the Herschel instruments PACS and SPIRE. We construct spectral energy distributions and derive the infrared excess. We extract line fluxes from the PACS and SPIRE spectra and construct rotational diagrams in order to estimate the excitation temperature of the gas. We derive CO, [O I] and [C I] luminosities to determine the physical conditions of the gas, and the dominant cooling mechanism. <BR /> Results: We confirm that the Herbig Be stars are surrounded by remnants from their parental clouds, with an
Free Keywords:circumstellar matter; stars: pre-main sequence; protoplanetary disks; astrochemistry; stars: individual: R Mon; stars: individual: PDS 27
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-6361 %R 10.1051/0004-6361/201629053
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