Highlights - Volume 496-3 (March IV 2009)
- Details
- Published on 24 March 2009
| HIGHLIGHTS: this week in A&A |
Volume 496-3 (March IV 2009)
| In section 5. Galactic structure, stellar clusters and populations “The warped young stellar disc in the Galactic centre”, by L. Subr, J. Schovancova, and P. Kroupa, A&A 496, p. 695 Within the central parsec of our Galaxy, several dozen stars orbit the central super-massive black hole in a coherent rotating disk. Beyond that distance, one finds a massive molecular torus. Based on a simple calculation of the Kozai effect induced by the torus, the paper proposes that the observed thickening of the stellar disk in the Galactic center is a warp induced by the gravitational field of the circumnuclear molecular cloud, and verifies that this hypothesis is consistent with currently published data. |
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| In section 7. Stellar structure and evolution “Binary planetary nebulae nuclei towards the Galactic bulge. I. Sample discovery, period distribution, and binary fraction?”, by B. Miszalski et al., A&A 496, p. 813 This paper by Miszalski et al. is long awaited. It presents the results of a survey for close binary central stars for planetary nebulae, which finally (after 20 years!) reinforces the statistics from a handful of objects detected in the past, and finalizes the conclusion that the binary fraction is 10-20% for a central star of PN that went through common envelope interaction. |
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© Astronomy & Astrophysics 2009