Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-09-25
Astronomy and Astrophysics
Astrophysics
7 pages including 2 tables. A&A accepted; also available at http://www.iac.es/publicaciones/preprints.html
Scientific paper
10.1051/0004-6361:20011301
A 34 x 34 arcmin field centred on the spiral galaxy M81 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 M81, separately. A distance modulus of 27.92+-0.23 mag is found for disk PNe, in good agreement with previous distance measurements for M81 (Jacoby et al. 1989; Huterer et al. 1995).
Corradi Romano L. M.
Magrini Laura
Mampaso Antonio
Perinotto Mario
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