The Intermediate Stellar Mass Population in NGC 604 Determined from Hubble Space Telescope Images

Details The Intermediate Stellar Mass Population in NGC 604 Determined from Hubble Space Telescope Images The Intermediate Stellar Mass Population in NGC 604 Determined from Hubble Space Telescope Images

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...456..174h&link_type=abstract

Astrophysical Journal v.456, p.174

Astronomy and Astrophysics

Astronomy

46

Galaxies: Individual Messier Number: M33, Galaxies: Photometry, Galaxies: Star Clusters, Galaxies: Stellar Content, Ism: H Ii Regions, Ism: Individual Ngc Number: Ngc 604, Stars: Luminosity Function, Mass Function

Scientific paper

We present photometry of stars in the giant H II region NGC 604 in M33. The photometry is measured from Hubble Space Telescope images through the F336W, F555W, and F814W broadband filters. Color-magnitude diagrams of the stars in NGC 604 show a main sequence detected down to an MF555W,0 of -1 (nearly 6 Msun). In addition, there are luminous stars that are probably blue and red supergiants. Based on the previously known presence of Wolf-Rayet stars, we take the age of the cluster to be 3-5 Myr. We measure an initial mass function for intermediate-mass stars (6.5-18 Msun) that has a slope of -1.6±0.7. This slope is, within the uncertainties, similar to those found for OB associations in the Milky Way and Magellanic Clouds. The density of the luminous stars in NGC 604 is also comparable to that of OB associations in those galaxies even though the total number of stars is greater in NGC 604. A few subclumps have densities that are higher by as much as a factor of 10. A comparison with R136 in the LMC emphasizes that the formation of a large number of massive stars does not necessarily entail a high concentration of those stars.

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