On the nature of the Galactic nebula We 1-12

Astronomy and Astrophysics – Astronomy

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H Ii Regions, Interstellar Matter, Infrared Astronomy Satellite, Planetary Nebulae, Iue, Astronomical Spectroscopy

Scientific paper

In 1977, Weinberger published a list of 12 new extended possible planetary nebulae (PNe). Whereas, because of their characteristic morphology and/or the presence of a blue central star, almost all of them could easily be suspected to be genuine planetary nebulae, one object (No. 12) captivated because of its unusually bright central star. This find prompted Kaler and Feibelman to question the PN nature of this object (We 1-12) on the basis of IUE spectra. A definite conclusion could, however, not be drawn by them; thus, until now, the real nature of We 1-12 remained unsolved. For the first time, a spectral investigation of both the central star and the nebula is presented in this paper. It definitely shows that this intriguing object is an (isolated) H II region and that its central star, as previously assumed, is an early B star which serves as the ionizing source. We 1-12, part of which is coincident with a weak IRAS point source, is at a distance of 2-2.6 kpc and is reddened by E(B-V) = 0.6-0.8 mag.

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