magnitudes observed with the naked eye recorded in seven old star catalogues were analyzed in order to examine the visual magnitude systems. Despite that psychophysists have proposed that human’s sensitivities are on a power-law scale, it is shown that the degree of agreement is far better for a logarithmic

Received sooner; accepted later We investigate the old star clusters in the sample of cluster candidates from Froebrich, Scholz & Raftery 2007 – the FSR list. Based on photometry from the 2 Micron All Sky Survey we generated decontaminated colour-magnitude and colour-colour diagrams to select a

We report the results of a coherent study of three chemically anomalous metal-poor ([Fe/H] ∼ –2) stars. These objects exhibit unusually low abundances of Mg, Si, Ca (α-elements) and Sr, Y, and Ba (neutron-capture elements). Our analyses confirm and expand upon earlier reports of atypical abundances

= 2.2 ± 0.2, B − H = 3.5 − 4.2, are extremely red and are similar to those of many S0 and elliptical galaxies. This represents strong evidence for a component of old stars. Recent studies find that low surface brightness galaxies span a wide range of morphologies and colors. In this context UGC 6614

and other research outputs Rusty old stars: a source of the missing interstellar iron?

Abstract. A brief overview is given of X-ray observations of old clusters. Most X-ray sources in old open clusters are interacting binaries, formed via evolution of a primordial binary, and emitting X-rays because of magnetic activity; however, a sizable fraction of the cluster sources is not well

Abstract not found

'«hyperactivité pédagogique » en milieu scolaire, et propose des avenues de changement pour que l'ensemble du processus éducatif à l'école adopte un caractère plus environnemental. under the tough old stars-To the real work, to “What is to be done.”

Luminous old SMC star clusters (we will refer as such to the red SMC clusters with age> 1Gyr – including intermediate age clusters (IAC) to globular clusters) have been systematically observed in the last decade, using

astro-ph version, accepted for publication in MNRAS- The definitive version is available at www.blackwell-synergy.com We investigate the star cluster population in the outer parts of the starburst galaxy NGC 5253 using archive images taken with the Hubble Space Telescope’s Advanced Camera