High-Resolution Far-Infrared Studies Of Intermediate-Mass Pre-Main-Sequence Objects

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dc.contributor.utaustinauthorDi Francesco, Jamesen_US
dc.contributor.utaustinauthorEvans, Neal J.en_US
dc.contributor.utaustinauthorHarvey, Paul M.en_US
dc.creatorDi Francesco, Jamesen_US
dc.creatorEvans, Neal J.en_US
dc.creatorHarvey, Paul M.en_US
dc.creatorMundy, Lee G.en_US
dc.creatorButner, Harold M.en_US
dc.date.accessioned2016-04-28T19:37:38Z
dc.date.available2016-04-28T19:37:38Z
dc.date.issued1998-12en
dc.description.abstractWe have obtained high-resolution far-infrared maps of nine regions with 10 Herbig Ae/Be stars (intermediate-mass pre-main-sequence stars). Similar maps were obtained for 10 embedded IRAS sources with S-v(100 mu m) > S-v(60 mu m) and L similar to 200 L., which are possible evolutionary precursors of Herbig Ae/Be stars. Single far-infrared sources were found in most maps. The embedded sources have positions in agreement with those of the IRAS PSC, but some of the Herbig Ae/Be stars are offset significantly from the position of peak far-infrared emission. For all objects where it was possible to obtain 100 mu m flux densities, they are consistent with those observed by IRAS, but derived 50 mu m Aux densities are larger than expected. The far-infrared maps reveal that objects in at least 17 of 19 emission regions are significantly extended at the 30 "-40 " resolution of the Kuiper Airborne Observatory at 100 mu m. Only sources associated with AB Aur and possibly IRAS 05338-0624 have unresolved far-infrared emission. Detailed analyses of the flux densities and positions from our maps suggest the far-infrared emission in regions with Herbig Ae/Be stars may not immediately surround these stars in all cases. Instead, far-infrared emission from these objects may originate from dust heated externally by the Herbig stars, or from dust heated internally by other sources. For other objects arguably surrounded by far-infrared emission, the Herbig stars or embedded IRAS objects have similar mean deconvolved sizes (i.e., 0.10-0.15 pc), but possibly have different mean deconvolved shapes (i.e., aspect ratios). Thus, far-infrared emission here may originate from flattened dust envelopes; the appearance of a far-infrared object as either a Herbig Ae/Be star or an embedded IRAS source may be merely a matter of viewing orientation.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipNASA NAG 2-420, NAG 2-1055en_US
dc.identifierdoi:10.15781/T21V68
dc.identifier.Filename1998_12_farinfrared.pdfen_US
dc.identifier.citationDi Francesco, James, Neal J. Evans II, Paul M. Harvey, Lee G. Mundy, and Harold M. Butner. "High-Resolution Far-Infrared Studies of Intermediate-Mass Pre-Main-Sequence Objects." The Astrophysical Journal, Vol. 509, No. 1 (Dec., 1998): 324.en_US
dc.identifier.doi10.1086/306479en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34950
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectinfrared : starsen_US
dc.subjectstars : pre-main-sequenceen_US
dc.subjectherbig ae/be starsen_US
dc.subjectdense coresen_US
dc.subjectnonthermal motionsen_US
dc.subjectdusten_US
dc.subjectlkh-alpha-198en_US
dc.subjectmillimeteren_US
dc.subjectmodelsen_US
dc.subjectclouden_US
dc.subjectdisksen_US
dc.subjectlineen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleHigh-Resolution Far-Infrared Studies Of Intermediate-Mass Pre-Main-Sequence Objectsen_US
dc.typeArticleen_US

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