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G2.4+1.4: An Extraordinary Mass-Loss Bubble Driven by an Extreme WO Star

Published online by Cambridge University Press:  03 August 2017

M.A. Dopita  and
T.A. Lozinskaya
M.A. Dopita
Affiliation:
1Mt. Stromlo and Siding Spring Observatories, Australian National University.
T.A. Lozinskaya
Affiliation:
2Sternberg State Astronomical Institute, Moscow State Astronomical Institute.

Abstract

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The nebula, G2.4+1.4, is shown to be a highly reddened, photoionised, mass-loss bubble of very high excitation powered by WR 102, the most extreme oxygen sequence Wolf-Rayet star known. It lies at a distance of 3±1kpc, and is about 11 pc in diameter. The exciting star, contains neither hydrogen nor helium in its atmosphere, is losing mass at a velocity of 5530 km.s-1, and has the following properties: log (Tion) = 5.20±0.05; log (R/R⊙) = 0.05±0.20; log (L/L⊙) = 5.85±0.20. We conclude that the star is the ~20M⊙ core of a supermassive star (M ≤ 60M⊙) seen near the end of its life.

Type
Session VI. Enrichment
Information
Symposium - International Astronomical Union , Volume 143: Wolf–Rayet Stars and Interrelations with other Massive Stars in Galaxies , 1991 , pp. 371 - 378
Copyright
Copyright © Kluwer 1991 

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