The Chemical Abundances of the Hydrogen-poor Planetary Nebulae A30 and A58

Details The Chemical Abundances of the Hydrogen-poor Planetary Nebulae A30 and A58 The Chemical Abundances of the Hydrogen-poor Planetary Nebulae A30 and A58

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...472..711g&link_type=abstract

Astrophysical Journal v.472, p.711

Astronomy and Astrophysics

Astronomy

35

Ism: Abundances, Ism: Planetary Nebulae: Individual Alphanumeric: A30, Ism: Planetary Nebulae: Individual Alphanumeric: A58, Stars: Agb And Post-Agb

Scientific paper

We present new CCD narrowband images and spatially resolved intermediate-dispersion spectroscopy of the hydrogen-poor nebulae A30 and A58. These data have allowed us to obtain information on the physical properties and chemical abundances of the inner knots and outer envelopes of A30 and A58 as a basis for the discussion of their implications in the evolutionary theories. In particular, hydrogen emission from the central knots has been carefully measured, and, consequently, the rates of conversion of hydrogen into helium have been established with accuracy. The rates found indicate that almost all the original hydrogen (between 75% and 95%) has been burned into helium. The chemical segregation among the knots of A30 previously suggested by Jacoby & Ford is confirmed. The A58 inner knot, which is spatially resolved in two different components, shows evidence of excitation by shocks. Helium abundances and the N/O ratio in the outer envelope of this nebula are very high, therefore indicating that the nebula formed as the result of the evolution of an intermediate-mass star.
An analysis of the chemical abundances, including other objects of the same class, gives some hints that He/H and 0/H are anticorrelated. The time elapsed between the formation of the outer envelopes and the ejection of the central knots also seems to be related to the central knots' chemical abundances.

Affiliated with

Also associated with

No associations

Rating

The Chemical Abundances of the Hydrogen-poor Planetary Nebulae A30 and A58 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 The Chemical Abundances of the Hydrogen-poor Planetary Nebulae A30 and A58, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Chemical Abundances of the Hydrogen-poor Planetary Nebulae A30 and A58 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-819201