Volume 379, Number 1, November III 2001
|Page(s)||90 - 95|
|Section||Cosmology (including clusters of galaxies)|
|Published online||15 November 2001|
New candidate planetary nebulae in M 81*
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
Corresponding author: L. Magrini, firstname.lastname@example.org
Accepted: 10 September 2001
A 34′ 34′ 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 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: ISM: planetary nebulae: general / galaxies: individual: M 81 / galaxies: ISM
© ESO, 2001
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