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Astron. Astrophys. 333, 389-389 (1998)

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Infrared observations and laboratory simulations
of interstellar CH4 and SO2

A.C.A. Boogert 1, W.A. Schutte 2, F.P. Helmich 2, A.G.G.M. Tielens 3 and D.H. Wooden 4

1 Kapteyn Astronomical Institute, P.O. Box 800, 9700 AV Groningen, The Netherlands
2 Leiden Observatory, P.O. Box 9513, 2300 RA Leiden, The Netherlands
3 MS 245-3, NASA Ames Research Center, Moffet Field, CA 94035, USA
4 MS 245-6, NASA Ames Research Center, Moffet Field, CA 94035, USA

Astron. Astrophys. 317, 929-941 (1997)

It was found that a factor of [FORMULA] is missing in the derived oscillator strengths of the [FORMULA] dyad of gaseous CH4, where J is the rotational quantum number. Correct model spectra are given in Figure 3. At the given physical parameters, the corrected line optical depths are lower with a factor 2-8. This large correction does not affect the conclusions drawn in this paper, but needs to be taken into account in future studies of interstellar gaseous CH4 (Boogert et al. 1998, accepted by A&A). We are grateful to E. Dartois for bringing this disturbing error to our attention.

[FIGURE] Fig. 3. Model spectra of gaseous [FORMULA] at different temperatures T and Doppler parameters b in the optically thin (top; N (CH4)= [FORMULA]  cm-2) and thick (bottom; N (CH4)= [FORMULA]  cm-2) cases at resolving power [FORMULA]. Note the different optical depth scales of the panels.

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© European Southern Observatory (ESO) 1998

Online publication: April 15, 1998