Mathematics – Logic
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.8002h&link_type=abstract
American Astronomical Society, 187th AAS Meeting, #80.02; Bulletin of the American Astronomical Society, Vol. 27, p.1400
Mathematics
Logic
Scientific paper
We present J and K images obtained under photometric conditions with the Lick 3m telescope of the Proto-Planetary Nebula IRAS 07131-0147 (galactic coordinates l=217, b=+4.7). This highly polarized bipolar reflection nebula is believed to be in the poorly understood evolutionary transition from the Asymptotic Giant Branch to Planetary Nebula. We find IRAS 07131-0147 to exhibit point reflection symmetry - a morphological characteristic rarely found in bipolar nebulae. Utilizing numerical integrations of single grain scattering models we derive a nearly face-on inclination angle of i < 5 degrees. The (J-K) color indicates that the central star (type M5 III) is negligibly reddened consistent with the `mid-butterfly' classification of the nebula (where the central star is relatively unobscured). Using the mean K magnitude of M5 galactic bulge giants, we estimate an approximate distance of 6 +/- 2 kpc, making this one of the most distant Proto-Planetary Nebulae known.
Alves David R.
Hoard Donald Wayne
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