Non-LTE Balmer line formation in late-type spectra: Effects of atomic processes involving hydrogen atoms

Astronomy and Astrophysics – Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Accepted for A&A; 12 pages, 11 figures

Scientific paper

10.1051/0004-6361:20066686

(*** abridged ***) Context: The wings of Balmer lines are often used as effective temperature diagnostics for late-type stars under the assumption they form in local thermodynamic equilibrium. Aims: Our goal is to investigate the non-LTE formation of Balmer lines in late-type stellar atmospheres, to establish if the assumption of LTE is justified. Furthermore, we aim to determine which collision processes are important for the problem; in particular, the role of collision processes with hydrogen atoms is investigated. Method: A model hydrogen atom for non-LTE calculations has been constructed accounting for various collision processes using the best available data from the literature. The processes included are inelastic collisions with electrons and hydrogen atoms, mutual neutralisation and Penning ionisation. Non-LTE calculations are performed, and the relative importance of the collision processes is investigated. Results: Our calculations show electron collisions alone are not sufficient to establish LTE for the formation of Balmer line wings. The role of inelastic collisions with neutral hydrogen is unclear. The available data for these processes is of questionable quality, and different prescriptions for the rate coefficents give significantly different results for the Balmer line wings. Conclusions: Improved calculations or experimental data are needed for excitation and, particularly, ionisation of hydrogen atoms in low-lying states by hydrogen atom impact at near threshold energies. Until such data are available, the assumption of LTE for the formation of Balmer line wings in late-type stars is questionable.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Non-LTE Balmer line formation in late-type spectra: Effects of atomic processes involving hydrogen atoms 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 Non-LTE Balmer line formation in late-type spectra: Effects of atomic processes involving hydrogen atoms, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-LTE Balmer line formation in late-type spectra: Effects of atomic processes involving hydrogen atoms will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-432092

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.