Hostname: page-component-cc8bf7c57-ksm4s Total loading time: 0 Render date: 2024-12-12T06:38:24.640Z Has data issue: false hasContentIssue false
  • English
  • Français

Circumstellar matter around the candidate protostar EL29

Published online by Cambridge University Press:  04 August 2017

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

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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 

References

Adams, , Lada, and Shu, (1986). Ap. J. (in press).Google Scholar
Elias, (1978). Ap. J. 224, 453.Google Scholar
Simon, et al. (1986). preprint.Google Scholar
Thompson, (1985). Ap. J. 299, L41.Google Scholar
Wilking, and Lada, (1983). Ap. J. 274, 698.Google Scholar
Yorke, (1980). Astron. Astrophys. 85, 215.Google Scholar
Young, , Lada, and Wilking, (1986). Ap. J. 304, L45.Google Scholar
Zinnecker, , Webster, and Geballe, (1985). in Nearby Molecular Clouds. Springer-Verlag, ed. Serra, G., p.81.Google Scholar
Zinnecker, , Chelli, and Perrier, (1983). in Star Forming Regions. IAU-Symp. 115, eds. Jugaku, & Peimbert, (Dordrecht: Reidel).Google Scholar