BI Crucis - A post-PN nebula?

Details BI Crucis - A post-PN nebula? BI Crucis - A post-PN nebula?

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265l..37s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 2, p. L37-L40.

Astronomy and Astrophysics

Astrophysics

28

Planetary Nebulae, Stellar Evolution, Symbiotic Stars, Accretion Disks, Spectral Energy Distribution, Stellar Models, Stellar Spectrophotometry, White Dwarf Stars

Scientific paper

The discovery of a bipolar nebula associated with the symbiotic star BI Cru is presented. The nebula has a high expansion velocity, and is kinematically and morphologically similar to He 2-104, the 'Southern Crab'. A high resolution spectrum of the central object shows an H-alpha line profile typical of an accretion disk, while IR photometry has shown that BI Cru also contains a short period Mira star. These data lead us to propose that BI Cru is a close binary. The white dwarf has produced a planetary nebula (PN) which has now dispersed, and through its accretion disk is now blowing a fast, collimated wind. This wind shows up as the bipolar, high velocity nebula observed here. We therefore conclude that BI Crucis is both a pre- and post-planetary nebula object, containing an AGB star and a white dwarf.

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