The circumbinary dusty disk around the hydrogen-deficient binary star υ Sagittarii

Details The circumbinary dusty disk around the hydrogen-deficient binary star υ Sagittarii The circumbinary dusty disk around the hydrogen-deficient binary star υ Sagittarii

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...499..827n&link_type=abstract

Astronomy and Astrophysics, Volume 499, Issue 3, 2009, pp.827-833

Astronomy and Astrophysics

Astrophysics

9

Stars: Emission-Line, Be, Stars: Binaries: Close, Stars: Circumstellar Matter, Techniques: Interferometric, Stars: Individual: Υ Sagittarii

Scientific paper

Aims: The aim of this paper is to determine the properties of the dusty environment of the hydrogen-deficient binary system υ Sgr, whose binary properties and other characteristics are poorly known. Methods: We obtained the first mid-IR interferometric observations of υ Sgr using the instrument MIDI of the VLTI used with different pairs of 1.8 m and 8 m telescopes. The calibrated visibilities, the N band spectrum, and the SED were compared with disk models computed with the MC3D code to determine the geometry and chemical composition of the envelope. Results: υ Sgr is unresolved with an 8 m telescope at 8.7 μm. We propose a disk model that agrees with the measured visibilities and the SED, consisting of a geometrically thin disk with an inner radius R_in = 6.0+0.5-1.5 AU and a scale height h100 = 3.5+2.0-1.5 AU. The chemical composition of the dust is approximately 60% of carbon dust and 40% of silicate dust, as a consequence of several episodes of mass transfers, whose chemistry was imprinted in the dust composition. We also constrain the inclination of the disk i = 50°+10°-20° and its orientation position angle PA = 80°+10°-5°. Conclusions: The mid-infrared interferometric observations of the binary star υ Sgr allowed us to constrain the geometry of the circumbinary dusty envelope. By defining the inclination and PA of the system with better accuracy than before, these observations restrict the parameter space for the orbital parameters and thus the nature of the stars orbiting in this system.
Based on observations made with the Very Large Telescope Interferometer at Paranal Observatory under program 079.D-0115.
Visibility data are only available in electronic form at the CDS website.

Affiliated with

Also associated with

No associations

Rating

The circumbinary dusty disk around the hydrogen-deficient binary star υ Sagittarii 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 The circumbinary dusty disk around the hydrogen-deficient binary star υ Sagittarii, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The circumbinary dusty disk around the hydrogen-deficient binary star υ Sagittarii will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-775196