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An Hst Study of Ob Associations and Star Clusters in M101
| Content Provider | Semantic Scholar |
|---|---|
| Author | Bresolin, Fabio |
| Copyright Year | 1996 |
| Abstract | The massive stellar content, the OB associations and the star clusters in an HST field in M101 = NGC 5457 are investigated. A clustering algorithm yields 79 putative associations. Their size distribution is similar to that found in the Magellanic Clouds, M31 and M33, with an average size around 90 pc. The V luminosity function for the stars contained within the associations has a slope d logN/dV = 0.60 ± 0.05, while an average reddening E(B−V ) = 0.21 mag is measured. The stellar content is further discussed by means of color-magnitude and color-color diagrams. Ages are estimated using theoretical isochrones, and range between 3 and 14 Myr (±2 Myr). We find a suggestion that the upper mass limit of the IMF for stars in OB associations in M101 may be quite high, contrary to some theoretical expectations that the mass limit should be lower in a high metallicity environment. Forty-one star cluster candidates and two H II region core clusters are identified in the M101 field, and their integrated photometric properties are compared with the cluster system of the LMC and M33. Most of the M101 clusters probably belong to the class of young, populous star clusters such as are found in the LMC. Red clusters are rare in this field. In the Appendix the objective finding algorithm is applied to the brightest stars in the Large Magellanic Cloud. 1 Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://arxiv.org/pdf/astro-ph/9606050v1.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | AURA Algorithm Balbiani Body CCL16 gene Cluster analysis Contain (action) Diagram ESA GUCY2C protein, human Little man computer MAG (cryptography) Magellanic Catalogue of Stars Mental association New General Catalogue Outside broadcasting Populous Stars, Celestial Stellar (payment network) clouds, cloudy statistical cluster |
| Content Type | Text |
| Resource Type | Article |
