Other
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...616..519s&link_type=abstract
The Astrophysical Journal, Volume 616, Issue 1, pp. 519-524.
Other
17
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
Scientific paper
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.
Gil de Paz Amando
Sahai Raghvendra
Sanchez Contreras Carmen
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