Pavel Kroupa
Astronomische Inst., Univ. Bonn (Bonn, Allemagne)
Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris
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| « The stellar initial mass function » |
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Pavel Kroupa |
| The stellar initial mass function (IMF) has been constrained to a reasonable degree of accuracy for Galactic-field populations and for on-going star-forming regions. I will discuss the methods of extracting the actual stellar IMF from observations, and will emphasise stellar-dynamical biases. While a conservative interpretation of the data suggest the IMF to be invariant, some indications do appear to exist to the extend that more metal-rich environments may be fragmenting into less-massive stars on average. Furthermore, assuming the IMF to be invariant implies that galactic-field populations have steeper field IMFs for massive stars which vary with the star-formation history of the galaxy. Recent surveys of star-forming regions indicate that about one brown dwarf is born per 4-5 stars. |
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vendredi 13 octobre 2006 - 11:00 Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |