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Environmental effects on stellar populations of star clusters and dwarf galaxies

Published online by Cambridge University Press:  31 March 2017

Stefano Pasetto ,
Mark Cropper ,
Yutaka Fujita ,
Cesare Chiosi  and
Eva K. Grebel
Stefano Pasetto
Affiliation:
Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, United Kingdom email: [email protected]
Mark Cropper
Affiliation:
Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, United Kingdom email: [email protected]
Yutaka Fujita
Affiliation:
Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka-shi, Osaka 560-0043, Japan
Cesare Chiosi
Affiliation:
Dept. of Physics & Astronomy “Galileo Galilei”, University of Padua, Vicolo dell’Osservatorio, 5, 35141 Padova PD, Italy
Eva K. Grebel
Affiliation:
Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstr 12-14, 69120, Heidelberg, Germany
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Abstract

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We investigate the competitive role of the different dissipative phenomena acting on the onset of star formation of gravitationally bound systems in an external environment. Ram pressure, Kelvin-Helmholtz and Rayleigh-Taylor instabilities, and tidal forces are accounted for separately in an analytical framework and compared in their role in influencing the star forming regions. We present an analytical criterion to elucidate the dependence of star formation in a spherical stellar system on its surrounding environment. We consider the different signatures of these phenomena in synthetically realized colour-magnitude diagrams (CMDs) of the orbiting system thus investigating the detectability limits of these different effects for future observational projects and their relevance. The developed theoretical framework has direct applications to the cases of massive star clusters, dwarf galaxies in galaxy clusters and dwarf galaxies orbiting our Milky Way system, as well as any primordial gas-rich cluster of stars orbiting within its host galaxy.

Keywords

Star clustergas instabilitiesstar formationcolour magnitude diagrams
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S316: Formation, evolution, and survival of massive star clusters , August 2015 , pp. 171 - 172
Copyright
Copyright © International Astronomical Union 2017 

References

Pasetto, S., Cropper, M., Fujita, Y., Chiosi, C., & Grebel, E. K., 2015, A&A, 573, A48 Google Scholar
Pasetto, S., Bertelli, G., Grebel, E. K., Chiosi, C., & Fujita, Y., 2012, A&A, 542, A17 Google Scholar