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Astron. Astrophys. 346, 705-712 (1999)

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Experimental determination of the band oscillator strengths of the CO A[FORMULA](11[FORMULA]v'[FORMULA]23)-X[FORMULA](v"=0) made at the LURE-SuperACO synchrotron facility.

M. Eidelsberg 1, A. Jolly 1, J.L. Lemaire 1,2, W.-ÜL. Tchang-Brillet 1,3, J. Breton 4,5 and F. Rostas 1

1 DAMAP et URA 812 du CNRS, Observatoire de Paris-Meudon, F-92195 Meudon Cedex, France
2 Université de Cergy-Pontoise, Centre de Neuville, F-95031 Cergy-Pontoise Cedex, France
3 Université Pierre et Marie Curie, 4 pl. Jussieu, F-75252 Paris Cedex 05, France
4 Université Pierre et Marie Curie - ESVUV, Case 081, 4 pl. Jussieu, F-75252 Paris Cedex 05, France
5 Université Paris-Sud, F-91405 Orsay Cedex, France

Received 10 August 1998 / Accepted 16 November 1998

Abstract

The band-integrated absorption oscillator strengths of the CO A[FORMULA](11[FORMULA]v'[FORMULA]23)-X[FORMULA](v"=0) transition have been measured using monochromatized synchrotron radiation from the LURE-SuperACO facility as background source. The absorption spectra were analyzed using the simulation-fitting technique described in an earlier publication (Jolly et al. 1997). Up to v'=20, the results are in good agreement with very recent ab initio calculations (Spielfiedel et al. 1999) and VUV laser measurements(Stark et al. 1998). For v'=23 which is measured here for the first time, and for v'=21 the measured oscillator strengths are found to be significantly larger than the calculated ones. Combining experimental and calculated results, a set of recommended oscillator strengths is proposed.

Key words: molecular data – ISM: molecules – ultraviolet: ISM

Send offprint requests to: M. Eidelsberg (eidelsberg@obspm.fr)

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© European Southern Observatory (ESO) 1999

Online publication: May 21, 1999
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