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The Proto-Planetary Nebula M1-92 and the Symbiotic Star MWC 560: Two Evolutionary Phases of the Same Type of Object?

A. Arrieta et al 2005 ApJ 623 252-268   doi: 10.1086/428391  Help

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A. Arrieta1, S. Torres-Peimbert2 and L. Georgiev2
1 Universidad Iberoamericana, Departmento de Física y Matemáticas, Prolongación Paseo de la Reforma 880, Lomas de Santa Fe, México DF 01210, Mexico
2 Instituto de Astronomía, Universidad Nacional Autonoma de México, Apartado Postal 70-264, México DF 04510, Mexico
E-mail: anabel.arrieta@uia.mx

ABSTRACT. Important similarities between the objects M1-92, a proto-planetary nebula of bipolar morphology, and MWC 560, a symbiotic star with a jet, have been found. A brief review of the previous studies for both objects is presented for the purpose of proposing mechanisms that best explain these similarities, since up to now both objects have been studied independently. From the comparison of the spectra of both objects, the existence of a jet is confirmed for the proto-planetary nebula M1-92, as well as its binary nature and the existence of a circumnuclear disk. Finally, an evolutionary sequence is proposed for the two objects where M1-92 is ~900 yr more evolved than MWC 560.

Subject headings: binaries: symbiotic; ISM: jets and outflows; planetary nebulae: individual (M1-92); stars: AGB and post-AGB; stars: individual (MWC 560)

Print publication: Issue 1 (2005 April 10)
Received 2003 July 12, accepted for publication 2004 December 17

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