Model atmospheres synthetic spectra - H/C/N/O abundance ratio in carbon stars

Details Model atmospheres synthetic spectra - H/C/N/O abundance ratio in carbon stars Model atmospheres synthetic spectra - H/C/N/O abundance ratio in carbon stars

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....49..443q&link_type=abstract

Astronomy and Astrophysics, vol. 49, no. 3, June 1976, p. 443-462.

Astronomy and Astrophysics

Astrophysics

15

Abundance, Atmospheric Models, Carbon, Carbon Stars, Late Stars, Stellar Atmospheres, Atmospheric Chemistry, Chemical Composition, High Resolution, Nuclear Fusion, Stellar Spectra, Stellar Spectrophotometry, Temperature Effects

Scientific paper

Synthetic spectra are obtained for carbon stars from a grid of model atmospheres which incorporates H/C/N/O abundances characteristic of either the CNO bi-cycle or the triple-alpha helium-burning process. The influence of the C-12/C-13 ratio on spectra composed of lines contributed by CO, CN, and C2 is discussed along with the influence of effective temperature, surface gravity, and chemical composition on the spectrum of each of the three molecules. The IR spectra of the carbon stars UU Aur and Y CVn in the range from 1 to 2.5 microns are studied by matching the synthetic spectra to high-resolution stellar spectra. It is found that the H/C/N/O abundances produced by the triple-alpha process simulate the stellar spectra better than those produced by the CNO equilibrium process. Computed emergent fluxes are compared with photometrically observed fluxes, and it is hypothesized that carbon stars with dust envelopes might have a composition characteristic of the triple-alpha process, while the composition of carbon stars without envelopes might be characteristic of the CNO bi-cycle.

Affiliated with

Also associated with

No associations

Rating

Model atmospheres synthetic spectra - H/C/N/O abundance ratio in carbon stars 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 Model atmospheres synthetic spectra - H/C/N/O abundance ratio in carbon stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Model atmospheres synthetic spectra - H/C/N/O abundance ratio in carbon stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1781161