2014/10/11 by T. Weselak, G. A. Galazutdinov, Weselak, T. +5
Physics and Astronomy · #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #astro-ph.GA
paper · pdf · doi:10.48550/arxiv.1410.3024
19 pages, 9 figure, accepted to Acta Astronomica with remark in the text concerning Fig. 3: "As it is seen in Table 4 column density obtained on the basis CH A-X 4300 A is two times higher than value from CH B-X 3886 A band. As a result equivalent width ratio of the CH 4300 and 3886 bands obtained from Eq. (2) should be multiplied by a factor of 2."
arxiv created 2014/10/20 · arxiv updated 2014/10/21
Detailed analysis of intensity ratios of unsaturated methylidyne (CH) A--X and B--X bands suggests consistency of the recently published oscillator strengths of A2Δ -- X2Π (0, 0) -- 4300 Å and B2Σ- -- X2Π (0, 0) -- (3878, 3886 and 3890 Å) bands (ie. 506, 107, 320 and 213×10-5 respectively). This result is based on extremely high S/N ratio spectra of 45 stars, acquired with three high-resolution spectrographs, situated in Chile: ESO LaSilla (HARPS), ESO Paranal (UVES) and Las Campanas (MIKE) and MAESTRO instrument situated in Northern Caucasus (Russia). The calculated methylidyne column densities, obtained using the consistent system of the oscillator strengths toward the observed targets, are given as well. We verify oscillator strengths of the CH+ A-X (0, 0) and (0, 1) bands at 4232 Å and 3957 Å equal to 545 and 342×10-5 respectively. We also confirm the lack of correlation between abundances of neutral CH and CH+ which the fact demonstrates that they are originated in different environments.