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arXiv:astro-ph/0411136 (astro-ph)
[Submitted on 5 Nov 2004]

Title:VINCI-VLTI measurements of HR 4049: the physical size of the circumbinary envelope

Authors:Simone Antoniucci, Francesco Paresce, Markus Wittkowski
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Abstract: We present the first detection of the envelope which surrounds the post-AGB binary source HR 4049. VINCI-VLTI K-band interferometric observations of this source imply the existence of a large structure with a Gaussian angular FWHM 22.4 +/- 1.4 mas or uniform disk diameter of 34.9 +/- 1.9 mas. With the Hipparcos parallax of 1.50 +/- 0.64 mas these values correspond to a physical size of 14.9 (+11.1,-4.4) AU and 23.3 (+17.3,-7.0) AU, respectively. Our measurements, covering an azimuth range of about 60 degrees, for the sky-projected baseline, provide information on the geometry of the emitting region and show that there is only a slight variation of the measured angular values along the different directions sampled. Thus, our results are consistent with a spherical geometry of the envelope. However, we cannot completely rule out the existence of an asymmetric envelope (like the circumbinary disk envisaged by some recent models) because of the limited spatial frequency and azimuth range covered by the observations.
Comments: 4 pages, 4 postscript figures, accepted letter for A&A
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0411136
  (or arXiv:astro-ph/0411136v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0411136
Journal reference: Astron.Astrophys. 429 (2005) L1-L4
Related DOI: https://doi.org/10.1051/0004-6361%3A200400097

Submission history

From: Simone Antoniucci [view email]
[v1] Fri, 5 Nov 2004 11:42:26 UTC (14 KB)
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