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arXiv:astro-ph/0411331 (astro-ph)
[Submitted on 12 Nov 2004]

Title:The role of HeH+ in cool helium rich white dwarfs

Authors:G. J. Harris, A. E. Lynas-Gray, S. Miller, J. Tennyson
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Abstract: 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.
Comments: 12 pages, 4 figures. Accepted for publication in ApJ Letters
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0411331
  (or arXiv:astro-ph/0411331v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0411331
Journal reference: Astrophys.J. 617 (2004) L143-L146
Related DOI: https://doi.org/10.1086/427391

Submission history

From: Gregory John Harris [view email]
[v1] Fri, 12 Nov 2004 11:18:30 UTC (35 KB)
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