EDP Sciences
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Volume 479, Number 1, February III 2008
Page(s) 149 - 154
Section Interstellar and circumstellar matter
DOI http://dx.doi.org/10.1051/0004-6361:20078540

A&A 479, 149-154 (2008)
DOI: 10.1051/0004-6361:20078540

Relation between CH cation and neutral/molecular hydrogen

T. Weselak1, G. Galazutdinov2, F. Musaev3, and J. Krelowski4

1  Department of Physics, Kazimierz Wielki University, Weyssenhoffa 11, 85-072 Bydgoszcz, Poland
    e-mail: towes@ukw.edu.pl
2  Korea Astronomy and Space Science Institute, Optical Astronomy Division, 61-1 Hwaam-Dong, Yuseong-Gu, Daejeon 305-348, Korea
    e-mail: gala@kasi.re.kr
3  Special astrophysical observatory, Nizhnij Arkhyz 369167, Russia
    e-mail: faig@sao.ru
4  Center for Astronomy, Nicolaus Copernicus University, Gagarina 11, Pl-87-100 Torun, Poland
    e-mail: jacek@astri.uni.torun.pl

(Received 24 August 2007 / Accepted 28 November 2007)

Observations of interstellar absorption bands of CH+ molecule at 3957 and 4232 Å were applied to determine column densities toward 53 stars. The targets were selected because the atomic and molecular hydrogen column densities are published. The data on CH+ were acquired using four echelle spectrographs situated in both the Northern and Southern hemispheres. Spatial relations between column densities of CH+ and those of molecular, atomic and total hydrogen show large scatter, suggesting there is no relation between abundances of methylidyne cation and hydrogen in any form.

Key words: ISM: molecules -- ISM: abundances

© ESO 2008