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arXiv:0706.2969 (astro-ph)
[Submitted on 20 Jun 2007]

Title:Optical spectroscopy of RU Cam, a pulsating carbon star

Authors:Tonu Kipper (1), Valentina Klochkova (2) ((1) - Tartu Observatory, Toravere, Estonia; (2) - Special Astrophysical Observatory, Nizhnii Arkhyz, Russia)
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Abstract: We analysed the high resolution spectra of a RU Cam, classified as W Vir type star. The atmospheric parameters of RU Cam were estimated Teff=5250K and log g=1.0. The hydrogen deficiency of RU Cam was not confirmed. The iron abundance, [Fe/H]=-0.37, is close to the solar one. Abundances of most other elements are also close to normal. We found considerable excesses of carbon and nitrogen: [C/Fe]=+0.98, [N/Fe]=+0.60. The carbon to oxygen ratio is C/O$\ge$1. The carbon isotopic abundance ratio is equal to C^12/C^13=4.5. For sodium a moderate overabundance Na/Fe=+0.55 was obtained. For two moments of observations we found close heliocentric velocity values, Vr=-21.7+/-0.8 and -23.1+/-1.0 km/s. Both spectra contain a peculiar feature - an emission component of NaI doublet which location agrees with the radial velocity from the bulk of metallic lines. For our two observing moments we found no dependence of radial velocities on the formation depth or on excitation energy for metallic lines.
Comments: 11 pages, 5 PS-figures, 2 tables, baltlat2-style
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0706.2969 [astro-ph]
  (or arXiv:0706.2969v1 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.2969

Submission history

From: Valentina Klochkova [view email]
[v1] Wed, 20 Jun 2007 12:32:40 UTC (48 KB)
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