2009A&A...499..827N


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST20:55:19

2009A&A...499..827N - Astronomy and Astrophysics, volume 499, 827-833 (2009/6-1)

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

NETOLICKY M., BONNEAU D., CHESNEAU O., HARMANEC P., KOUBSKY P., MOURARD D. and STEE P.

Abstract (from CDS):

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. We obtained the first mid-IR interferometric observations of υ Sgr using the instrument MIDI of the VLTI used with different pairs of 1.8m and 8m 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. υ Sgr is unresolved with an 8 m telescope at 8.7µm. We propose a disk model that agrees with the measured visibilities and the SED, consisting of a geometrically thin disk with an inner radius Rin=6.0+0.5–1.5AU and a scale height h100=3.5+2.0–1.5AU. 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°. 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.

Abstract Copyright:

Journal keyword(s): stars: emission-line, Be - stars: binaries: close - stars: circumstellar matter - techniques: interferometric - stars: individual: υ Sagittarii

Simbad objects: 9

goto Full paper

goto View the reference in ADS

Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2131 0
2 HD 142804 * 15 57 05.2072580095 -16 02 03.884605552   8.316 6.542     M1.5III 41 0
3 * eta Sgr LP? 18 17 37.6350518 -36 45 42.066723 6.37 4.67 3.11 1.55 0.23 M2III 132 0
4 * del Sgr * 18 20 59.6435424 -29 49 41.165919   4.069 2.668     K2.5IIIaCN0.5 161 0
5 * lam Sgr PM* 18 27 58.2407185 -25 25 18.114589 4.75 3.85 2.81 2.06 1.50 K1IIIb 259 0
6 * bet Lyr bL* 18 50 04.7952472 +33 21 45.609978 2.85 3.42 3.42 3.31 3.29 B8.5Ib-II 886 0
7 * ksi02 Sgr * 18 57 43.7990826 -21 06 23.961268 5.82 4.69 3.51 2.71 2.12 G8/K0II/III 108 0
8 * tau Sgr PM* 19 06 56.4052936935 -27 40 13.609432896 5.65 4.51 3.31 2.44 1.85 K1.5IIIb 144 0
9 * ups Sgr Be* 19 21 43.6228354 -15 57 18.062473 4.18 4.71 4.61 4.34 4.21 B2Vp_sh 284 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2009A&A...499..827N and select 'bookmark this link' or equivalent in the popup menu


2020.07.04-20:55:19

© Université de Strasbourg/CNRS

    • Contact