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Spectrophotometry and Multicolour Imagery of the Planetary Nebula Around the P Cygni Star AG Carinae

  • C. Rossi (a1), A. Altamore (a1), R.D.D. Costa (a2), A. Damineli Neto (a2), J.A. De Freitas Pacheco (a2), A. Cassatella (a3), A.R. Marenzi (a3), P. Persi (a3), V.F. Polcaro (a3) and R. Viotti (a3)...

Extract

Some of the high luminosity stars in our Galaxy are surrounded by planetary-like nebulae formed by material ejected from the central star. The most interesting case is that of the ring nebula PK 289-0° 1 around the P Cygni star AG Car. Long slit spectroscopy shows that nitrogen is overabundant and oxygen underabundant in the nebula. The Hα/[NII] ratio is lower in the nebula with respect to the surrounding H II region, possibly as a result of the N overabundance in the stellar wind. The emission line peak separation confirms a model of a distorted spherical shell expanding at 66 km s−1. The scattered star's spectrum is observable near the star, suggesting the presence of circumstellar dust grains. A nebular mass of at least 2.7 M is derived. While the nebula in the Hα imagery reveals the ring-like shape with many structures, in the blue it is much fainter and smoother. No nebular emission was detected in the JHK bands, suggesting a low dust temperature.

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Spectrophotometry and Multicolour Imagery of the Planetary Nebula Around the P Cygni Star AG Carinae

  • C. Rossi (a1), A. Altamore (a1), R.D.D. Costa (a2), A. Damineli Neto (a2), J.A. De Freitas Pacheco (a2), A. Cassatella (a3), A.R. Marenzi (a3), P. Persi (a3), V.F. Polcaro (a3) and R. Viotti (a3)...

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