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29 March 2024
 
  » arxiv » astro-ph/0109437

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Evidence for binarity in the bipolar planetary nebulae A79, He2-428 and M1-91
M. Rodriguez ; R.L.M. Corradi ; A. Mampaso ;
Date 25 Sep 2001
Subject astro-ph
Affiliation Instituto Nacional de Astrofisica, Optica y Electronica - Puebla - Mexico, Isaac Newton Group of Telescopes - La Palma - Spain, Instituto de Astrofisica de Canarias - Tenerife - Spain
AbstractWe present low and high resolution long-slit spectra of three bipolar planetary nebulae (PNe) with bright central cores: A79, He2-428 and M1-91. He2-428 and M1-91 have high density (from 10^3.3 to 10^6.5 cm^-3) unresolved nebular cores that indicate that strong mass loss/exchange phenomena are occurring close to their central stars. An F0 star is found at the centre of symmetry of A79; its reddening and distance are consistent with the association of the star with the nebula. The spectrum of the core of He2-428 shows indications of the presence of a hot star with red excess emission, probably arising in a late-type companion. A79 is one of the richest PNe in N and He, the abundances of M1-91 are at the lower end of the range spanned by bipolar PNe, and He2-428 shows very low abundances, similar to those measured for halo PNe. The extended nebulae of A79 and He2-428 have inclined equatorial rings expanding at a velocity of approx. 15 km/s, with kinematical ages 10^4 yr. The association of these aged, extended nebulae with a dense nebular core (He2-428) or a relatively late type star (A79) is interpreted as evidence for the binarity of their nuclei.
Source arXiv, astro-ph/0109437
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