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Issue A&A
Volume 371, Number 2, May IV 2001
Page(s) 497 - 506
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20010401



A&A 371, 497-506 (2001)
DOI: 10.1051/0004-6361:20010401

A Catalog of OB Associations in the spiral galaxy NGC 300

G. Pietrzynski1, 2, W. Gieren1, P. Fouqué3, 4 and F. Pont5

1  Universidad de Concepción, Departamento de Fisica, Casilla 160-C, Concepción, Chile
    e-mail: wgieren@coma.cfm.udec.cl
2  Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
3  Observatoire de Paris-Meudon DESPA, 92195 Meudon Cedex, France
4  European Southern Observatory, Casilla 19001, Santiago 19, Chile
    e-mail: pfouque@eso.org
5  Universidad de Chile, Departamento de Astronomia, Casilla 36D, Santiago, Chile
    e-mail: FredericPont@obs.unige.ch

(Received 2 January 2001 / Accepted 13 March 2001 )

Abstract
We present results of a search for OB associations in NGC 300. Using an automatic and objective method (PLC technique) 117 objects were found. Statistical tests indicate that our sample is contaminated by less than 10 detections due to random concentrations of blue stars. Spatial distributions of detected associations and H II regions are strongly correlated. The size distribution reveals a significant peak at about 60 $\mu$rad which corresponds to 125 parsecs if a distance modulus of 26.66 mag is assumed. Besides the objects with sizes corresponding to typical associations we also found several much larger objects. A second level application of our detection method revealed that most of these are composed of smaller subgroups, with sizes of about 100 pc.


Key words: galaxies: NGC 300: star clusters -- galaxies: stellar content -- stars: early type

Offprint request: G. Pietrzynski, pietrzyn@hubble.cfm.udec.cl

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© ESO 2001


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