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- W2156671537 abstract "The goal of this paper is a detailed analysis of the dusty environment of Herbig Ae/Be stars and FU Orionis ob- jects. For this purpose we mapped 22 regions at 1.3 mm wave- length containing 25 target objects. We found that it is indispens- able to perform mapping in contrast to pointed On-On measure- ments in order to obtain the correct distribution of cold material around young stellar objects and to relate 1.3 mm flux densi- ties to individual sources. To get reliable information about the structure and shape of the dust configurations and their relation to the stellar sources, we superimposed the millimetre maps on near-infrared images. The comparison of the data demon- strated that some of the Herbig Ae/Be stars are not associated with the peak of the millimetre emission. This is obviously the case for V 376 Cas/LkH 198, MWC 137, CoD-4211721, and V 1685 Cyg/V 1686 Cyg. We found two different morphologies of the dust envelopes: 6 regions show a compact structure, whereas 12 regions are characterized by a core/envelope structure. The disk objects AB Aur and HD 163296 show only a compact core and are not surrounded by an extended envelope. We did not detect HK Ori, HD 250550, LkH 25, and V 1515 Cyg which all have low IRAS luminosities. Based on the flux densities derived from the millimetre maps, we estimated characteristic physical parameters like den- sity and mass assuming optically thin emission. The total masses of the circumstellar regions around the Herbig Ae/Be stars with core/envelope structure and with genuine point-like millime- tre sources are 8060 M and 0.150.15 M, respectively. The lowest and highest masses of the circumstellar material were found around AB Aur (0.03 M) and CoD-4211721 (1100 M), respectively. The average densities in the cores range from 10 5 to 10 8 cm 3 . The densities of the extended envelopes are of the order of 10 4 to 10 5 cm 3 . In addition, we combined the measured millimetre flux den- sities with infrared and optical data and modelled the broad- band spectral energy distributions using spherically symmet- ric models. We found good fits for both the core sources Send offprint requests to: Th. Henning ? Partially based on observations collected at the European Southern" @default.
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- W2156671537 date "1998-08-01" @default.
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- W2156671537 title "Infrared imaging and millimetre continuum mapping of Herbig Ae/Be and FU Orionis stars" @default.
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