A&A 386, 869-873 (2002)
DOI: 10.1051/0004-6361:20020296

The Local Group Census: Planetary nebulae in Sextans B

L. Magrini¹, R. L. M. Corradi², N. A. Walton², A. A. Zijlstra³, D. L. Pollacco⁴, J. R. Walsh⁵, M. Perinotto¹, D. J. Lennon² and R. Greimel<sup>2

1</sup>  Dipartimento di Astronomia e Scienza dello Spazio, Universitá di Firenze, L.go E. Fermi 2, 50125 Firenze, Italy
²  Isaac Newton Group of Telescopes, Apartado de Correos 321, 38700 Santa Cruz de La Palma, Canarias, Spain
³  Physics Department, UMIST, PO Box 88, Manchester M60 1QD, UK
⁴  School of Pure and Applied Physics, Queen's University Belfast, Belfast BT7 9NN, Northern Ireland, UK
⁵  ST-ECF, E.S.O., Karl-Schwarzschild-Strasse 2, 85748 Garching bei München, Germany

(Received 21 December 2001 / Accepted 26 February 2002)

Abstract
Five planetary nebulae (PNe) have been discovered in the nearby dwarf irregular galaxy. Emission line images were obtained using the Wide Field Camera of the 2.5 m Isaac Newton Telescope (INT) at La Palma (Spain). The candidate PNe were identified by their point-like appearance and relatively strong [O III] emission-line fluxes. They are located within a galactocentric distance of 2.8 arcmin, corresponding to 1.1 kpc at the distance of Sextans B . Luminosities are in the range 1800-5600 . Sextans B is one of the smallest dwarf irregular galaxies with a PN population. The number of PNe detected suggest an enhanced star formation rate between 1 and 5 Gyr ago.

Key words: planetary nebulae: individual -- galaxies: individual: Sextans B

Offprint request: R. Corradi, rcorradi@ing.iac.es

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