On the origin of the extended infrared shell around NGC 6888

Details On the origin of the extended infrared shell around NGC 6888 On the origin of the extended infrared shell around NGC 6888

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997azh....74..376l&link_type=abstract

Astronomicheskij Zhurnal, vol. 74, p. 376

Astronomy and Astrophysics

Astronomy

2

Wolf-Rayet Stars, Stellar Envelopes, Nebulae, Infrared Astronomy, Cosmic Dust, Line Spectra, Error Analysis, Background Radiation

Scientific paper

The results of a program of research on the extended infrared shell around the nebula NGC 6888 and the star WR 136 are presented. We performed H-alpha observations with a Fabry-Perot interferometer mounted at the focus of a 125-cm telescope and radio continuum (2.7 to 31 cm) and 21-cm HI observations with the RATAN-600 radio telescope. A thick expanding shell of neutral hydrogen 120 pc in diameter that immediately surrounds the extended infrared shell was detected. This suggests that the infrared shell is a single structure rather than a projection of physically unrelated objects. The radial velocity of the HI shell is 11 +/- 1 km/s, the expansion velocity is 10 +/- 3 km/s, and the mass of the neutral hydrogen in the shell is 10 exp 4 solar masses. The bright radio features that we detected in the region of the infrared shell all exhibit a flat spectmm typical of thermal emission from optically thin HII regions. The same inference is probably also true for the nebula Simeiz 55. Our observations are consistent with the assumption of Marston that the extended shell was formed by the stellar wind from the precursor of WR 136, but they do not rule out the identification with a very old supernova remnant proposed by Nichols-Bohlin and Fesen.

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