2009A&A...506L..49M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST22:01:19

2009A&A...506L..49M - Astronomy and Astrophysics, volume 506, L49-52 (2009/11-2)

VLTI/AMBER unveils a possible dusty pinwheel nebula in WR118.

MILLOUR F., DRIEBE T., CHESNEAU O., GROH J.H., HOFMANN K.-H., MURAKAWA K., OHNAKA K., SCHERTL D. and WEIGELT G.

Abstract (from CDS):

Most Wolf-Rayet stars (WR) of the WC9 subtype exhibit a dusty circumstellar envelope, but it is still a matter of debate how dust can form in their harsh environment. In a few cases, a pinwheel-like structure of the dusty envelope has been detected; therefore, it has been suggested that dust formation in all dusty WR stars might be linked to colliding winds in a binary system. We probed the innermost region of the circumstellar dust shell of the deeply embedded WR star WR118. We carried out spectro-interferometric observations using the AMBER instrument of ESO's Very Large Telescope Interferometer in low-spectral resolution mode (R=35). The K-band observations were obtained with three 1.8m telescopes spanning projected baselines between 9.2 and 40.1m. At high spatial frequencies, the AMBER visibilities exhibit a prominent lobe, indicating that the envelope contains one or several zones with a large local intensity gradient. The strong closure phase signal clearly shows that the circumstellar envelope of WR118 can only be described by an asymmetric intensity distribution. We show that a pinwheel nebula seen at low inclination is consistent with the AMBER data. Its size was determined to be 13.9±1.1mas. WR118 possibly harbors a pinwheel nebula, which suggests a binary nature of the system. According to our best model, the period of the system would be ≃60 days (for d=3kpc), making WR118 the shortest-period pinwheel nebula known so far.

Abstract Copyright:

Journal keyword(s): stars: individual: WR118 - stars: Wolf-Rayet - stars: winds, outflows - stars: circumstellar matter - techniques: interferometric - techniques: spectroscopic

Simbad objects: 6

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Number of rows : 6

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 * gam02 Vel WR* 08 09 31.95013 -47 20 11.7108 0.64 1.58 1.83 1.85 2.00 WC8+O7.5III-V 839 0
2 WR 98a WR* 17 41 13.0431655551 -30 32 30.425152324   18.40   15.20 13.82 WC8/9 88 1
3 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 443 0
4 MR 80 WR* 18 02 04.1238716757 -23 37 42.144766363   14.85       WC9 207 2
5 WR 112 WR* 18 16 33.49 -18 58 42.3   20.7 17.7     WC8+O6/7III/V 117 0
6 RAFGL 2179 WR* 18 31 42.2117071870 -09 59 16.687501795   25.0 22.0     WC9 84 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-22:01:19

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