Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aj....118..948c&link_type=abstract
The Astronomical Journal, Volume 118, Issue 2, pp. 948-959.
Astronomy and Astrophysics
Astronomy
14
Ism: Bubbles, Ism: Individual (Ngc 2359), Stars: Individual (Hd 56925), Stars: Wolf-Rayet
Scientific paper
Based on H I 21 cm line and radio continuum observations performed with the Very Large Array of the National Radio Astronomy Observatory and on optical narrowband images obtained at the Cerro Tololo Inter-American Observatory, we investigate the distribution of the ionized and neutral gas in the region of the ring nebula NGC 2359 surrounding the Wolf-Rayet star HD 56925 at a distance of 5 kpc. The radio continuum data, obtained at 1465 MHz with an angular resolution of ~30", have the same morphology as the optical Hα nebular line emission. An ionized mass of 70 M_solar and an electron density (corrected for filling factor) of 120 cm^-3 were estimated for the filamentary shell, while the mass in the whole ionized complex is in the range 850-1100 M_solar. The H I 21 cm line data, with angular and velocity resolutions of ~45" and 1.3 km s^-1, respectively, reveal for the first time neutral hydrogen clearly interacting with the optical ring nebula at its systemic velocity of 54 km s^-1 and at 63 km s^-1. The H I gas distribution at 54 km s^-1 indicates the location of the ionization fronts. The estimated total neutral mass is ~320 M_solar. Most of this mass seems to be located in a hemispherical shell expanding at 6-7 km s^-1. Taking into account the ionized, neutral, and molecular components, the mass associated with the NGC 2359 complex is about 2200 M_solar. The dynamics of the nebula are consistent with momentum conservation or with an intermediate stage between energy and momentum conservation.
Cappa Cristina E.
Goss William Miller
Niemela Virpi S.
Ostrov Pablo G.
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