SIMBAD references

2004ApJ...616..519S - Astrophys. J., 616, 519-524 (2004/November-3)

The companion to the central mira star of the protoplanetary nebula OH 231.8+4.2.


Abstract (from CDS):

We present deep optical long-slit spectra of the peculiar protoplanetary nebula (PPN) OH 231.8+4.2 obtained with the 6.5 m Baade Telescope at Las Campanas Observatory (Chile). In addition to the molecular absorption bands characteristic of the M9-10 III star inside OH 231.8+4.2 (QX Pup), we identify lines of the Balmer series in absorption, which do not form in the cool atmospheres of late M-type stars. We also confirm the presence of a blue continuum excess with an intensity that is a factor ∼30 larger than that expected for an M9-10 III star. Our results indicate the presence of a source hotter than QX Pup illuminating OH 231.8+4.2 that is likely a main-sequence star with spectral type A. We discuss how the formation and nebular evolution of OH 231.8+4.2 could have been affected by the presence of a binary system in its core.

Abstract Copyright:

Journal keyword(s): Stars: Binaries: General - Stars: Circumstellar Matter - Stars: AGB and Post-AGB - Stars: Individual: Alphanumeric: OH 231.8+4.2 - Stars: Mass Loss - Stars: Variables: Other

Simbad objects: 4

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