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Astron. Astrophys. 328, 602-605 (1997)

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Research Note

A search for [FORMULA] Pictoris-like Ca II circumstellar gas around Ursa Major Stream stars *

A. Lecavelier des Etangs 1, 2, R. Ferlet 2 and A. Vidal-Madjar 2

1 NCRA, TATA Institute of Fundamental Research, Post Bag 3, Ganeshkhind, Pune University Campus, Pune 411 007, India
2 Institut d'Astrophysique de Paris, CNRS, 98 bis Boulevard Arago, F-75014 Paris, France

Received 7 January 1997 / Accepted 11 June 1997


We carried out an optical spectroscopic survey of twenty one stars to search for Ca II circumstellar gas at the stellar velocity similar to that found in the [FORMULA] Pictoris disk. The surveyed stars are A-type stars with large [FORMULA] in the Ursa Major stellar kinematic group. No evidence of circumstellar gas was found around any of the stars. This result suggests that [FORMULA] Pictoris either is a very peculiar object surrounded by an anomalous amount of gas, or is younger than the stars in the Ursa Major Group ([FORMULA] years).

Key words: stars: circumstellar matter – planetary systems – line: profiles

* Based on observations collected at Observatoire de Haute Provence, CNRS, France

Send offprint requests to: A. Lecavelier des Etangs

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© European Southern Observatory (ESO) 1997

Online publication: March 26, 1998