Discovery of Two New, Carbon-rich Proto-Planetary Nebulae:IRAS Z02229+6208 and IRAS 07430+1115

Details Discovery of Two New, Carbon-rich Proto-Planetary Nebulae:IRAS Z02229+6208 and IRAS 07430+1115 Discovery of Two New, Carbon-rich Proto-Planetary Nebulae:IRAS Z02229+6208 and IRAS 07430+1115

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...513..869h&link_type=abstract

The Astrophysical Journal, Volume 513, Issue 2, pp. 869-878.

Astronomy and Astrophysics

Astronomy

27

Stars: Circumstellar Matter, Infrared: Stars, Stars: Post-Asymptotic Giant Branch, Stars: Supergiants

Scientific paper

We report the discovery of two new carbon-rich proto-planetary nebulae (PPNs), IRAS Z02229+6208 and 07430+1115. Optical spectroscopy of these sources and another previously discovered PPN, IRAS 05431+0852, reveals the presence of C_2 and C_3 in absorption. All three objects have the spectra of G-K supergiants, consistent with the expectations of their being PPNs. New ground-based optical and infrared photometry, combined with the IRAS measurements, show double-peak spectral energy distributions for each; this suggests that the asymptotic giant branch (AGB) mass loss has ended and these objects are in the post-AGB phase of evolution. The remnant of the molecular envelope is detected in CO emission for the first time in all three objects, using the CO (3-2) line. The 3.3 and 11.3 μm emission features commonly attributed to the polycyclic aromatic hydrocarbon molecules have been detected in IRAS 07430+1115. Strikingly absent in IRAS 07430+1115, however, is the 21 μm emission feature, found in the other two and in all but one of the other PPNs known to show C_2 in absorption.

Affiliated with

Also associated with

No associations

Rating

Discovery of Two New, Carbon-rich Proto-Planetary Nebulae:IRAS Z02229+6208 and IRAS 07430+1115 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Discovery of Two New, Carbon-rich Proto-Planetary Nebulae:IRAS Z02229+6208 and IRAS 07430+1115, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Discovery of Two New, Carbon-rich Proto-Planetary Nebulae:IRAS Z02229+6208 and IRAS 07430+1115 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1444028