R. H. Méndez, Virpi Sinikka Niemelä
Abstract
Spectrograms of the central stars of the planetary nebulae NGC 246, He 2-131, and He 2-138 are described. Variations have been found in the spectra of the first two stars. The central star of He 2-138 has a BC0 Ib spectrum; this is the first case of a low-mass star showing 'OBC' characteristics.
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Spectrograms of the central stars of the planetary nebulae NGC 246, He 2-131, and He 2-138 are described. Variations have been found in the spectra of the first two stars. The central star of He 2-138 has a BC0 Ib spectrum; this is the first case of a low-mass star showing 'OBC' characteristics.
Key concepts: Physics, Planetary nebula, Stars, Astrophysics, Astronomy, Spectral line