Clusters and stellar angular-momentum evolution
نویسندگان
چکیده
منابع مشابه
Stellar evolution with rotation IV: von Zeipel’s theorem and anisotropic losses of mass and angular momentum
The von Zeipel theorem is generalised to account for differential rotation in the case of a “shellular” rotation law (cf. Zahn 1992). We write this law in the form Ω = Ω(r), a simplification which does not apply to fast rotation. We find that von Zeipel’s relation contains a small additional term, generally further increasing the radiative flux at the pole and decreasing it at the equator. We a...
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Observations have revealed that most stars are born in clusters. These systems, containing from tens to thousands of stars and typically significant mass in gas in the youngest systems, evolve due to a combination of stellar and star-gas interactions. Simulations of pure stellar systems are used to investigate possible initial configurations including ellipticity, substructure and mass segregat...
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Using hydrodynamic simulations we investigate the rotational properties and angular momentum evolution of prestellar and protostellar cores formed from gravoturbulent fragmentation of interstellar gas clouds. We find the specific angular momentum j of molecular cloud cores in the prestellar phase to be on average 〈 j〉 = 7 × 1020 cm2 s−1 in our models. This is comparable to the observed values. ...
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We investigate the structure and evolution of blue stragglers stars which were formed from direct stellar collisions between main sequence stars in globular clusters. In particular, we look at the rotational evolution of the products of off-axis collisions. As found in previous work, such blue stragglers initially have too high an angular momentum to contract down to the main–sequence. We consi...
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Aims. In this pilot study, we examine molecular jets from the embedded Class I sources, HH 26 and HH 72, to search, for the first time, for kinematic signatures of jet rotation from young embedded sources. Methods. High-resolution long-slit spectroscopy of the H2 1−0 S(1) transition was obtained using VLT/ISAAC. The slit was placed perpendicular to the flow direction about 2′′ from the sources....
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2009
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921309991864