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Astron. Astrophys. 335, 292-294 (1998)

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Research Note

Limits on molecular emission from the planetary nebula associated with Sakurai's object

A. Evans 1, S.P.S. Eyres 1, T. Naylor 1 and A. Salama 2

1 Department of Physics, Keele University, Keele, Staffordshire, ST5 5BG, UK
2 ISO Science Operations Centre, ESA Astrophysics Division, PO Box 50727, E-28080 Madrid, Spain

Received 21 January 1998 / Accepted 20 March 1998

Abstract

We have observed Sakurai's object in the S(1)[FORMULA] line of H2 and in the J line of 12CO. We give upper limits on the H2 and 12CO emission from the planetary nebula associated with this object. Assuming a distance of 3.8 kpc, we obtain an upper limit on the mass of molecular hydrogen in the planetary nebula of 1.8 [FORMULA] for an excitation temperature of 1000 K and, for an excitation temperature of 25 K, an upper limit of 1.5 [FORMULA] on the mass of CO.

Key words: stars: circumstellar matter – infrared: ISM: lines and bands – radio lines: ISM – Sakurai's object = V 4334 Sgr

Send offprint requests to: A. Evans

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© European Southern Observatory (ESO) 1998

Online publication: June 12, 1998

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