| Issue |
A&A
Volume 379, Number 1, November III 2001
|
|
|---|---|---|
| Page(s) | 90 - 95 | |
| Section | Cosmology (including clusters of galaxies) | |
| DOI | https://doi.org/10.1051/0004-6361:20011301 | |
| Published online | 15 November 2001 | |
New candidate planetary nebulae in M 81*
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
Corresponding author: L. Magrini, laura@arcetri.astro.it
Received:
6
August
2001
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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