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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 boulevard Arago, F-75014 Paris, France
2Department of Astronomy & Astrophysics, Enrico Fermi Institute, The University of Chicago, Chicago IL 60637-1433, USA

Received 22 January 1997 / Accepted 24 February 1997


We present the results of observations of the FORMULA Å interstellar absorption line of 9Be II in the direction of FORMULA Per. The data were obtained at the Canada-France-Hawaii 3.6m Telescope using the Coudé f/4 Gecko spectrograph at a resolving power FORMULA FORMULA , and a signal-to-noise ratio FORMULA . The 9Be II line is not detected, and we obtain an upper limit on the equivalent width FORMULA µÅ. This upper limit is 7 times below the lowest upper limit ever reported hitherto. The derived interstellar abundance is (9Be/H) FORMULA , not corrected for the depletion of 9Be onto interstellar grains; it corresponds to an upper limit FORMULA 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: FORMULA Per

*Based on observations collected at the Canada-France-Hawaii Telescope, Hawaii, USA.

Send offprint requests to: G. Hébrard (hebrard@iap.fr)

© European Southern Observatory (ESO) 1997