The role of HeH+ in cool helium rich white dwarfs

Details The role of HeH+ in cool helium rich white dwarfs The role of HeH+ in cool helium rich white dwarfs

2004-11-12

arxiv.org/abs/astro-ph/0411331v1

Astrophys.J. 617 (2004) L143-L146

Astronomy and Astrophysics

Astrophysics

12 pages, 4 figures. Accepted for publication in ApJ Letters

Scientific paper

10.1086/427391

HeH$^+$ is found to be the dominant positive ion over a wide range of temperatures and densities relevant to helium rich white dwarfs. The inclusion of HeH$^+$ in ionization equilibrium computations increases the abundance of free electrons by a significant factor. For temperatures below 8000 K, He$^-$ free-free absorption is increased by up to a factor of 5, by the inclusion of HeH$^+$. Illustrative model atmospheres and spectral energy distributions are computed, which show that HeH$^+$ has a strong effect upon the density and pressure structure of helium rich white dwarfs with teff < 8000 K. The inclusion of HeH$^+$ significantly reddens spectral energy distributions and broad band color indices for models with Teff < 5500 K. This has serious implications for existing model atmospheres, synthetic spectra and cooling curves for helium rich white dwarfs.

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