Authors: D. Adén, S. Feltzing, A. Koch, M. I. Wilkinson, E. K. Grebel, I. Lundström, G. F. Gilmore, D. B. Zucker, V. Belokurov, N. W. Evans and D. Faria
A&A 506, 1147 (2009) Received 18 June 2009 / Accepted 13 August 2009
Keywords: galaxies: dwarf, galaxies: fundamental parameters, galaxies: individual: Hercules, galaxies: kinematics and dynamics, galaxies: photometry

Authors: G. Bihain, R. Rebolo, M. R. Zapatero Osorio, V. J. S. Béjar, I. Villó-Pérez, A. Díaz-Sánchez, A. Pérez-Garrido, J. A. Caballero, C. A. L. Bailer-Jones, D. Barrado y Navascués, J. Eislöffel, T. Forveille, B. Goldman, T. Henning, E. L. Martín and R. Mundt
A&A 506, 1169 (2009) Received 26 March 2009 / Accepted 31 July 2009
Keywords: stars: luminosity function, mass function, Galaxy: open clusters and associations: individual: \sigma Orionis, stars: low-mass, brown dwarfs

Authors: G. Consolini, R. Tozzi and P. De Michelis
A&A 506, 1381 (2009) Received 2 October 2008 / Accepted 5 June 2009
Keywords: Sun: activity, Sun: sunspots, methods: statistical, chaos

Authors: M. A. T. Groenewegen, G. C. Sloan, I. Soszy?ski and E. A. Petersen
A&A 506, 1277 (2009) Received 11 June 2009 / Accepted 20 August 2009
Keywords: stars: AGB and post-AGB, stars: mass loss, Magellanic Clouds

Author: M.-R. L. Cioni
A&A 506, 1137 (2009) Received 24 March 2009 / Accepted 9 August 2009

Keywords: galaxies: abundances, Magellanic Clouds, Local Group, stars: AGB and post-AGB, galaxies: stellar content, galaxies: individual: M33

Authors: D. Ruždjak, H. Boži?, P. Harmanec, R. Fi?t, P. Chadima, K. Bjorkman, D. R. Gies, A. B. Kaye, P. Koubský, D. McDavid, N. Richardson, D. Sudar, M. Šlechta, M. Wolf and S. Yang
A&A 506, 1319 (2009) Received 4 July 2008 / Accepted 24 August 2009
Keywords: stars: early-type, binaries: spectroscopic, stars: emission-line, Be, stars: individual: \zeta Tauri

Authors: M. Karlický and J. Kašparová
A&A 506, 1437 (2009) Received 2 June 2009 / Accepted 29 July 2009
Keywords: Sun: flares, Sun: particle emission, Sun: X-rays, gamma rays

Authors: A. M. Read, R. D. Saxton, P. G. Jonker, E. Kuulkers, P. Esquej, G. Pojmanski, M. A. P. Torres, M. R. Goad, M. J. Freyberg and M. Modjaz
A&A 506, 1309 (2009) Received 16 March 2009 / Accepted 24 August 2009
Keywords: stars: novae, cataclysmic variables, stars: individual: XMMSL1 J060636.2-694933, surveys, X-rays: general

Authors: R. C. Gamen, E. Fernández-Lajús, V. S. Niemela and R. H. Barbá
A&A 506, 1269 (2009) Received 2 May 2008 / Accepted 1 August 2009
Keywords: stars: binaries: close, stars: binaries: eclipsing, stars: binaries: spectroscopic, stars: Wolf-Rayet

Author: C. A. Olano
A&A 506, 1215 (2009) Received 29 May 2009 / Accepted 30 July 2009
Keywords: hydrodynamics, shock waves, Galaxy: disk, ISM: bubbles, ISM: supernova remnants

Authors: M. Kama, M. Min and C. Dominik
A&A 506, 1199 (2009) Received 13 March 2009 / Accepted 27 July 2009
Keywords: stars: circumstellar matter, stars: planetary systems: protoplanetary disks

Authors: B. Pérez-Rendón, G. García-Segura and N. Langer
A&A 506, 1249 (2009) Received 5 April 2008 / Accepted 20 March 2009
Keywords: stars: evolution, ISM: kinematics and dynamics, ISM: supernova remnants, ISM: bubbles, ISM: individual objects: Cassiopeia A

Authors: B. Külebi, S. Jordan, F. Euchner, B. T. Gänsicke and H. Hirsch
A&A 506, 1341 (2009) Received 25 May 2009 / Accepted 8 July 2009
Keywords: stars: white dwarfs, stars: magnetic fields, stars: atmospheres

Authors: N. G. Shchukina, V. L. Olshevsky and E. V. Khomenko
A&A 506, 1393 (2009) Received 12 March 2009 / Accepted 25 June 2009

Keywords: Sun: photosphere, Sun: granulation, line: formation, techniques: spectroscopic, hydrodynamics, radiative transfer

The nearby stars are of all ages, which gives them
a broad variety of luminosities and colors.  To see stars of the
same age, to see the effects of mass and composition alone on
a star's color and luminosity, one must examine star clusters.
All of the stars in a star cluster are born at about same time.
The open clusters scattered in the Galactic disk provide us with
collections of young stars.  The ancient globular clusters that
swarm around the Galactic center provide us with collections of
old stars.  By creating Herzsprung-Russell diagrams for both types
of star cluster—plots of the colors and luminosities of
stars—astrophysicists gain insight into how stars, especially
stars more massive than the Sun, change over billions of years.

Authors: F. M. Rieger and F. A. Aharonian
A&A 506, L41 (2009) Received 25 May 2009 / Accepted 18 September 2009
Keywords: acceleration of particles, black hole physics, radiation mechanisms: non-thermal, galaxies: active, galaxies: jets

Authors: S. Criscuoli, P. Romano, F. Giorgi and F. Zuccarello
A&A 506, 1429 (2009) Received 12 March 2009 / Accepted 23 July 2009
Keywords: Sun: activity, Sun: magnetic fields, Sun: flares

Little more than 350 stars are known to be
within 10 parsecs of the Sun.  Most of these are too dim
to see with the unaided eye. Several, however, are among
the brightest stars in the night sky.  The 10 brightest are
listed in a table on this page, along with their distances,
apparent visual magnitudes, absolute visual magnitudes,
color indices, and stellar types.

Authors: H. Bhadkamkar and P. Ghosh
A&A 506, 1297 (2009) Received 21 May 2009 / Accepted 23 August 2009
Keywords: X-rays: binaries, stars: neutron, stars: evolution, accretion, accretion disks, ISM: supernova remnants, X-rays: general

Authors: G. Busquet, Aina Palau, R. Estalella, J. M. Girart, G. Anglada and I. Sepúlveda
A&A 506, 1183 (2009) Received 13 February 2009 / Accepted 27 July 2009
Keywords: stars: formation, ISM: individual objects: IRAS 00213+6530, ISM: clouds