Astron. Astrophys. 324, 1145-1148
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A very reduced upper limit on the interstellar abundance of beryllium*
Guillaume Hébrard1 and Martin Lemoine2, and Roger Ferlet1, and Alfred Vidal-Madjar1
1Institut d'Astrophysique de Paris, CNRS, 98 bis
F-75014 Paris, France
Received 22 January 1997 / Accepted 24 February 1997
We present the results of observations of the Å interstellar absorption line of 9Be II in the direction of Per. The data were obtained at the Canada-France-Hawaii 3.6m Telescope using the Coudé f/4 Gecko spectrograph at a resolving power , and a signal-to-noise ratio . The 9Be II line is not detected, and we obtain an upper limit on the equivalent width µÅ. This upper limit is 7 times below the lowest upper limit ever reported hitherto. The derived interstellar abundance is (9Be/H) , not corrected for the depletion of 9Be onto interstellar grains; it corresponds to an upper limit dex on the depletion factor of 9Be. As such, it argues in favour of models of formation of dust grains in stellar atmospheres.
Key words: ISM: abundances - stars: individual: Per
*Based on observations collected at the Canada-France-Hawaii
Telescope, Hawaii, USA.
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© European Southern Observatory (ESO) 1997