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Astron. Astrophys. 355, 713-719 (2000)
A search for planetary nebulae in M33 *
L. Magrini 1,
R.L.M. Corradi 2,
A. Mampaso 2 and
M. Perinotto 1
1 Dipartimento di Astronomia e Scienza dello Spazio, Universitá di Firenze, Largo E. Fermi 5, 50125 Firenze, Italy
2 Instituto de Astrofísica de Canarias, c. Vía Láctea s/n, 38200, La Laguna, Tenerife, Spain
Received 24 July 1999 / Accepted 9 November 1999
Abstract
We searched for planetary nebulae (PNe) in the nearby spiral galaxy
M33 using the Wide Field Camera at the 2.54 m Isaac Newton
Telescope of La Palma (Spain). Images in the
[O III ] nebular line at
![[FORMULA]](img1.gif)
5007Å, in the
H![[FORMULA]](img2.gif)
+[N II ] lines
around 6560 Å, and in the continuum around 5550Å
allowed us to detect a large number of emission line objects. Among
them, 134 candidate PNe have been selected. In addition, we found 63
emission-line objects which have a non-negligible continuum emission,
and for this reason they have been conservatively discarded from the
group of candidate PNe. We have derived the PN luminosity function. It
agrees very well with that of galaxies in the Local Group. The
resulting distance to M33 is ![[FORMULA]](img3.gif)
kpc, in
excellent agreement with the value obtained using Cepheids.
Key words: ISM: planetary nebulae:
general 
galaxies: individual:
M33
galaxies: ISM
* Based on observations obtained at the 2.5m INT telescope operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de Los Muchachos of the Instituto de Astrofisica de Canarias.
Send offprint requests to: M. Perinotto (mariop@arcetri.astro.it)
Contents
- 1. Introduction
- 2. Observations and data reduction
- 3. Data analysis
- 4. Discussion
- 5. Summary and conclusions
- Acknowledgements
- References
© European Southern Observatory (ESO) 2000
Online publication: March 9, 2000
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