Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-12-14
Mon.Not.Roy.Astron.Soc.367:400-406,2006
Astronomy and Astrophysics
Astrophysics
11 Pages, 9 figures, 2 tables, including 1 landscape table. Accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2005.09960.x
We build an accurate database of 5200 HCN and HNC rotation-vibration energy levels, determined from existing laboratory data. 20~000 energy levels in the Harris et al. (2002) linelist are assigned approximate quantum numbers. These assignments, lab determined energy levels and Harris et al (2002) energy levels are incorporated in to a new energy level list. A new linelist is presented, in which frequencies are computed using the lab determined energy levels where available, and the ab initio energy levels otherwise. The new linelist is then used to compute new model atmospheres and synthetic spectra for the carbon star WZ Cas. This results in better fit to the spectrum of WZ Cas in which the absorption feature at 3.56 micron is reproduced to a higher degree of accuracy than has previously been possible. We improve the reproduction of HCN absorption features by reducing the abundance of Si to [Si/H] = --0.5 dex, however, the strengths of the $\Delta v=2$ CS band heads are over-predicted.
Harris Gregory J.
Jones Hugh R. A.
Kaminsky B. M.
Pavlenko Ya. V.
Tennyson Jonathan
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