Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...435..852j&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 435, no. 2, p. 852-863
Astronomy and Astrophysics
Astrophysics
52
Mass Flow Rate, Red Giant Stars, Stellar Envelopes, Stellar Models, Stellar Temperature, Stellar Winds, Stellar Mass, Stellar Spectra
Scientific paper
We have developed a radiative transfer model of the dust and gas envelopes around late-type stars. The gas kinetic temperature for each star is calculated by solving equations of motion and the energy balance simultaneously. The main processes include viscous heating and adiabatic and radiative cooling. Heating is dominated by viscosity as the grains stream outward through the gas, with some contribution in oxygen-rich stars by near-IR pumping of H2O followed by collisional de-excitation in the inner envelope. For O-rich stars, rotational H2O cooling is a dominant mechanism in the middle part of the envelope, with CO cooling being less significant. We have applied our model to three well-studied oxygen-rich red giant stars. The three stars cover a wide range of mass-loss rates, and hence they have different temperature structures. The derived temperature structures are used in calculating CO line profiles for these objects. Comparison of the dust and gas mass-loss rates suggests that mass-loss rates are not constant during the asymptotic giant branch phase. In particular, the results show that the low CO 1-0 antenna temperatures of OH/IR stars reflect an earlier phase of much lower mass-loss rate.
Justtanont Kay
Skinner Christopher J.
Tielens Alexander G. G. M.
No associations
LandOfFree
Molecular rotational line profiles from oxygen-rich red giant winds 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 Molecular rotational line profiles from oxygen-rich red giant winds, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Molecular rotational line profiles from oxygen-rich red giant winds will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1022123