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Circumstellar matter around the candidate protostar EL29

Published online by Cambridge University Press:  04 August 2017

H. Zinnecker
Affiliation:
Royal Observatory, Edinburgh
C. Perrier
Affiliation:
Observatoire de Lyon, St. Genis-Lavel
A. Chelli
Affiliation:
Instituto de Astronomia, Mexico City

Extract

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Infrared speckle interferometric observations at 3.6 μm carried out at the ESO 3.6m telescope have indicated that EL29, a deeply embedded infrared source in the Ophiuchus dark cloud (Elias 1978), appears to have a core-halo structure (Zinnecker, Chelli and Perrier 1989). A fit to the data gave angular scales of order of 0.05 arcsec for the core and 3.5 arcsec for the halo (Gaussian FWHM) corresponding to linear diameters of 8 AU and 620 AU, respectively (for a distance to the cloud of 160 pc). New infrared speckle observations confirm that the core is resolved at the 2 sigma level, and carries about 90% of the total 3.6 μm flux (Fig. 1). Furthermore, there is evidence from a recent IRTF lunar occultation experiment in the K-band (2.2 μm) for an additional inner 6 milli-arcsec (~ 1 AU) core which carries about 75–85% of the total K-flux from this source (Simon et al 1986). Perhaps this inner core is the dust shell inside of which grains are destroyed by the radiation from a central object.

Type
Bipolar Flows, Jets and Protostars
Copyright
Copyright © Reidel 1987 

References

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