Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-11-05
Astron.Astrophys. 429 (2005) L1-L4
Astronomy and Astrophysics
Astrophysics
4 pages, 4 postscript figures, accepted letter for A&A
Scientific paper
10.1051/0004-6361:200400097
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.
Antoniucci Simone
Paresce Francesco
Wittkowski Markus
No associations
LandOfFree
VINCI-VLTI measurements of HR 4049: the physical size of the circumbinary envelope does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with VINCI-VLTI measurements of HR 4049: the physical size of the circumbinary envelope, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and VINCI-VLTI measurements of HR 4049: the physical size of the circumbinary envelope will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-497672