Planetary nebula or symbiotic Mira? Near infrared colours mark the difference

Abstract

Nebulae around symbiotic Miras look very much like genuine planetary nebulae, although they are formed in a slightly different way. We present near infrared photometry of known and suspected symbiotic nebulae obtained with the Deep Near Infrared Southern Sky Survey (DENIS). We demonstrate that the near infrared colours are an excellent tool to distinguish symbiotic from genuine planetary nebulae. In particular we find that the bipolar planetary nebulae M 2-9 and Mz 3 are in fact symbiotic Miras. Further observations on prototype symbiotic Miras prove that the proposed classification scheme works generally.

4 pages, 3 figures; accepted for publication as A&A Letter

References in corpus (1)

• Planetary nebula or symbiotic Mira? Near infrared colours mark the difference

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