No CrossRef data available.
Article contents
Circumstellar matter around the candidate protostar EL29
Published online by Cambridge University Press: 04 August 2017
Extract
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
- Information
- Symposium - International Astronomical Union , Volume 122: Circumstellar Matter , 1987 , pp. 65 - 66
- Copyright
- Copyright © Reidel 1987