Query : 2008A&A...478..443C

2008A&A...478..443C - Astronomy and Astrophysics, volume 478, 443-452 (2008/2-1)

VLA and Effelsberg observations of the interstellar medium around the runaway star WR124.


Abstract (from CDS):

We present very large array (VLA) and Effelsberg radio continuum and 21cm HI line observations of the interstellar medium (ISM) surrounding the runaway star WR124 and the nebula M1-67. The HI data have been used to investigate the effects that a star with a strong stellar wind and a high peculiar velocity has on the ISM. The VLA 21cm HI observations were combined with single-dish Effelsberg observations to produce a series of HI images sensitive to all angular scales from the VLA resolution limit (∼46'') up to the primary field of individual VLA antennae (FWHM=36'). MSX and IRIS images were used to analyze the infrared emission around the star. Because the star is highly supersonic with respect to its local ISM, the observed HI distribution around the star is interpreted in terms of a simple bow shock model. The analysis of the HI data reveals the presence of a cavity centered on the star at an LSR velocity of ∼60km/s, consistent with a distance estimate of 5kpc for WR124. A second HI cavity is observed located 10' to the north of the stellar position, consistent with the direction of motion of WR124. The VLA continuum image at 8.5GHz shows a remarkable resemblance to the optical images. All available radio continuum data suggest a purely thermal spectrum for the nebula. The MSX and IRIS infrared data show a changing morphology with wavelength. The dust temperature deduced from the infrared luminosities is in agreement with previous observations of bow shocks.

Abstract Copyright:

Journal keyword(s): ISM: bubbles - ISM: individual objects: WR124 - stars: Wolf-Rayet - ISM: HII regions

Simbad objects: 5

goto Full paper

goto View the references in ADS

Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2675 2
2 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4065 2
3 Hen 2-427 WR* 19 11 30.8749167768 +16 51 38.200938264   12.19 11.50     WN8h 328 0
4 ICRF J192439.4+154043 Bz? 19 24 39.45588 +15 40 43.9420           ~ 33 1
5 ICRF J192559.6+210626 BLL 19 25 59.60535560 +21 06 26.1620442           ~ 187 1

To bookmark this query, right click on this link: simbad:objects in 2008A&A...478..443C and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact