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Abstract:

Aims: We present very large array (VLA) and Effelsberg radio continuum and 21 cm Hi line observations of the interstellar medium (ISM) surrounding the runaway star WR 124 and the nebula M 1-67. 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. Methods: The VLA 21 cm 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. Results: The analysis of the HI data reveals the presence of a cavity centered on the star at an LSR velocity of ∼60 km s-1, consistent with a distance estimate of 5 kpc for WR124. A second HI cavity is observed located 10' to the north of the stellar position, consistent with the direction of motion of WR 124. The VLA continuum image at 8.5 GHz 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. © ESO 2008.

Registro:

Documento: Artículo
Título:VLA and Effelsberg observations of the interstellar medium around the runaway star WR 124
Autor:Cichowolski, S.; Pineault, S.; Arnal, E.M.; Cappa, C.E.
Filiación:Instituto de Astronomía y Física del Espacio (IAFE), CC67, Suc.28, 1428 Buenos Aires, Argentina
Département de Physique and Observatoire du Mont Mégantic, Université Laval, Ste-Foy, QC G1K 7P4, Canada
Instituto Argentino de Radioastronomía, C.C.5, 1894 Villa Elisa, Argentina
Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, 1900 La Plata, Argentina
Palabras clave:H II regions; ISM; ISM: bubbles; ISM: individual objects: WR 124; Stars: Wolf-rayet; H II regions; ISM; ISM: bubbles; ISM: individual objects: WR 124; Stars: Wolf-rayet; Geometrical optics; Plasma shock waves; Stars
Año:2008
Volumen:478
Número:2
Página de inicio:443
Página de fin:452
DOI: http://dx.doi.org/10.1051/0004-6361:20078339
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v478_n2_p443_Cichowolski

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Citas:

---------- APA ----------
Cichowolski, S., Pineault, S., Arnal, E.M. & Cappa, C.E. (2008) . VLA and Effelsberg observations of the interstellar medium around the runaway star WR 124. Astronomy and Astrophysics, 478(2), 443-452.
http://dx.doi.org/10.1051/0004-6361:20078339
---------- CHICAGO ----------
Cichowolski, S., Pineault, S., Arnal, E.M., Cappa, C.E. "VLA and Effelsberg observations of the interstellar medium around the runaway star WR 124" . Astronomy and Astrophysics 478, no. 2 (2008) : 443-452.
http://dx.doi.org/10.1051/0004-6361:20078339
---------- MLA ----------
Cichowolski, S., Pineault, S., Arnal, E.M., Cappa, C.E. "VLA and Effelsberg observations of the interstellar medium around the runaway star WR 124" . Astronomy and Astrophysics, vol. 478, no. 2, 2008, pp. 443-452.
http://dx.doi.org/10.1051/0004-6361:20078339
---------- VANCOUVER ----------
Cichowolski, S., Pineault, S., Arnal, E.M., Cappa, C.E. VLA and Effelsberg observations of the interstellar medium around the runaway star WR 124. Astron. Astrophys. 2008;478(2):443-452.
http://dx.doi.org/10.1051/0004-6361:20078339