Highlights - Volume 471-3 (September I 2007)

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HIGHLIGHTS: this week in A&A

Volume 471-3 (September I 2007)


Circumbinary molecular rings in Orion

Circumbinary molecular rings around young stars in Orion”, by L.A. Zapata, P.T.P. Ho, L.F. Rodriguez, P. Schilke, and S. Kurtz, A&A 471, p. L59

This paper reports observations of the massive starforming region OMC1S, located behind the Orion nebula, with the Submillimeter Array and the Very Large Array. It offers the first proof that circumbinary rotating rings around two young stars may exist in a region of high-mass star formation.



Abundance of silicon and iron on the surface of HR 7224

The helium weak silicon star HR 7224. II. Doppler Imaging analysis”, by H. Lehmann, A. Tkachenko, L. Fraga, V. Tsymbal, and D.E. Mkrtichian, A&A 471, p. 919

This paper investigates the abundance distributions of silicon and iron on the surface of HR 7224, using the Doppler imaging technique. The authors show the presence of large silicon and iron spots on the star's surface.


In section 1. Letters

“Accurate Spitzer infrared radius measurement for the hot Neptune GJ 436b”, by M. Gillon, B.-O. Demory, T. Barman, X. Bonfils, T. Mazeh, F. Pont, S. Udry, M. Mayor, and D. Queloz, A&A 471, p. L51

In this paper, the authors describe Spitzer infrared photometric observations of the exo-Neptune GJ 436b, which they recently discovered transiting its host star. It is the closest, smallest, and least massive planet known to transit its (M-dwarf) host star.  


© Astronomy & Astrophysics 2007