A Hubble Space Telescope study of extragalactic OB associations Academic Article

abstract

• We present a study of OB associations, identified by objective means, in seven spiral galaxies observed with the Hubble Space Telescope as part of the Key Project on the distance scale. The properties of the associations, including their size distribution and average diameter, and the luminosity function of their brightest stars, do not vary significantly among galaxies, even for changes in Hubble type. These findings support previous suggestions about the existence of similarly sized elementary cells of star formation in galaxies, and the conclusion, obtained by others with more extensive data, that the upper stellar mass function does not vary significantly. The data suggest that the average number of stars in associations changes with morphological type, confirming previous studies of the integrated magnitudes of OB associations in H II regions.

authors

• Kennicutt, Robert
• Macri, Lucas

published proceedings

• ASTRONOMICAL JOURNAL

author list (cited authors)

• Bresolin, F., Kennicutt, R. C., Ferrarese, L., Gibson, B. K., Graham, J. A., Macri, L. M., ... Turner, A. M.

citation count

• 48

complete list of authors

• Bresolin, F||Kennicutt, RC||Ferrarese, L||Gibson, BK||Graham, JA||Macri, LM||Phelps, RL||Rawson, DM||Sakai, S||Silbermann, NA||Stetson, PB||Turner, AM

publication date

• July 1998

publisher

• American Astronomical Society  Publisher

published in

• Astronomical Journal  Journal

keywords

• Galaxies : Stellar Content

Digital Object Identifier (DOI)

• 10.1086/300424

start page

• 119

end page

• 130

volume

• 116

issue

• 1

URL

• http://dx.doi.org/10.1086/300424