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Issue A&A
Volume 379, Number 1, November III 2001
Page(s) 90 - 95
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20011301



A&A 379, 90-95 (2001)
DOI: 10.1051/0004-6361:20011301

New candidate planetary nebulae in M 81

L. Magrini1, M. Perinotto1, R. L. M. Corradi2 and A. Mampaso3

1  Dipartimento di Astronomia e Scienza dello Spazio, Universitá di Firenze, L. go E. Fermi 5, 50125 Firenze, Italy
2  Isaac Newton Group of Telescopes, Apartado de Correos 321, 38700 Santa Cruz de La Palma, Canarias, Spain
3  Instituto de Astrofísica de Canarias, c. Vía Láctea s/n, 38200, La Laguna, Tenerife, Canarias, Spain

(Received 6 August 2001 / Accepted 10 September 2001)

Abstract
A 34$^\prime$ $\times$34$^\prime$ field centred on the spiral galaxy M 81 has been searched for emission-line objects using the prime focus wide field camera (WFC) of the 2.54 m Isaac Newton Telescope (La Palma, Spain). A total of 171 candidate planetary nebulae (PNe) are found, 54 of which are in common with the ones detected by Jacoby et al. (1989). The behaviour of PNe excitation as a function of galactocentric distance is examined, and no significant variations are found. The PNe luminosity function is built for the disk and bulge of M 81, separately. A distance modulus of $27.92 \pm 0.23$ mag is found for disk PNe, in good agreement with previous distance measurements for M 81 (Jacoby et al. 1989; Huterer et al. 1995).


Key words: planetary nebulae -- galaxies: M 81 -- galaxies: ISM

Offprint request: L. Magrini, laura@arcetri.astro.it

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