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Title:
A study of the neutral hydrogen in direction to the GUM nebula
Authors:
Dubner, G.; Giacani, E.; Cappa de Nicolau, C.; Reynoso, E.
Affiliation:
AA(CONICET, Inst. de Astronomia y Fisica del Espacio, Buenos Aires, Argentina), AB(Inst. Argentino de Radioastronomia, Villa Elisa, Argentina), AC(Inst. Argentino de Radioastronomia, Villa Elisa, Argentina), AD(CONICET, Inst. de Astronomia y Fisica del Espacio, Buenos Aires, Argentina)
Publication:
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 96, no. 3, p. 505-523. (A&AS Homepage)
Publication Date:
12/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
GUM NEBULA, HYDROGEN, NEUTRAL GASES, RADIO TELESCOPES, SUPERNOVA REMNANTS, WOLF-RAYET STARS, B STARS, EARLY STARS, O STARS, STELLAR MASS EJECTION
Bibliographic Code:
1992A&AS...96..505D

Abstract

This paper presents 44 gray-scale maps at constant velocity of the distribution of H I in the direction of the Gum nebula. It is shown that there is no H I shell with a size comparable to the 36 deg diameter optical nebulosities and that there is a thick H I shell, about 7 deg in radius, shifted from the center of the optical nebula by more than 10 deg. The observations are consistent with a model in which the Gum nebula is the remnant of a supernova explosion that occurred about 2.6 million yr ago. The presence of two new H I bubbles associated with SWR 12 and 14, plus a possible one around WR 13, are disclosed from analysis of the H I gas distribution around the four WR star located beyond the Gum nebula. These H I bubbles have characteristics similar to those previously observed. Three shell-like objects probably related to OB stars and H II regions are also described.

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