Search Publications
The O-Na and Mg-Al anticorrelations in turn-off and early subgiants in globular clusters
Pasquini, L.; Bonifacio, P.; Grundahl, F. +16 more
High dispersion spectra (R>~ 40 000) for a quite large number of stars at the main sequence turn-off and at the base of the giant branch in NGC 6397 and NGC 6752 were obtained with the UVES on Kueyen (VLT UT2). The [Fe/H] values we found are -2.03+/- 0.02+/- 0.04\ and -1.42+/- 0.02+/- 0.04\ for NGC 6397 and NGC 6752 respectively, where the firs…
Late-type members of young stellar kinematic groups - I. Single stars
Montes, D.; López-Santiago, J.; Cornide, M. +3 more
This is the first paper of a series aimed at studying the properties of late-type members of young stellar kinematic groups. We concentrate our study on classical young moving groups such as the Local Association (Pleiades moving group, 20-150Myr), IC 2391 supercluster (35Myr), Ursa Major group (Sirius supercluster, 300Myr), and Hyades supercluste…
The Galactic Disk Mass Budget. I. Stellar Mass Function and Density
Chabrier, Gilles
In this paper, we use the general theory worked out within the past few years for the structure and the evolution of low-mass stars to derive the stellar mass function in the Galactic disk down to the vicinity of the hydrogen-burning limit from the observed nearby luminosity functions. The accuracy of the mass-magnitude relationships derived from …
All-sky compiled catalogue of 2.5 million stars
Kharchenko, N. V.
The all-sky Compiled Catalogue of more than 2.5 million stars with the limiting magnitude V ≈14(m) was created as a result of combining of star lists from present-day large high-precision catalogues of space (HIPPARCOS Tycho family catalogues) and ground-based (PPM, CMC11) observations and reducing them to the standard systems of corresponding ste…
Population effects on the red giant clump absolute magnitude, and distance determinations to nearby galaxies
Salaris, Maurizio; Girardi, Léo
The red giant clump has been recently argued to be a reliable distance indicator for the galaxies in the Local Group. The accuracy of distance determinations based on this method, however, depends on the possible presence of systematic magnitude differences (ΔMIRC) between the local clump revealed by the Hipparcos colour-magnitude diagram (CMD), a…
delta Scuti and related stars: Analysis of the R00 Catalogue
Rodríguez, E.; Breger, M.
We present a comprehensive analysis of the properties of the pulsating delta Scuti and related variables based mainly on the content of the recently published catalogue by Rodríguez et al. (\cite{retal00a}, hereafter R00). In particular, the primary observational properties such as visual amplitude, period and visual magnitude and the contribution…
Order and chaos in the local disc stellar kinematics induced by the Galactic bar
Fux, R.
The Galactic bar causes a characteristic splitting of the disc phase space into regular and chaotic orbit regions which is shown to play an important role in shaping the stellar velocity distribution in the Solar neighbourhood. A detailed orbital analysis within an analytical 2D rotating barred potential reveals that this splitting is mainly dicta…
The local axisymmetric instability criterion in a thin, rotating, multicomponent disc
Rafikov, R. R.
Purely gravitational perturbations are considered in a thin rotating disc composed of gas and several stellar components. The dispersion relation for the axisymmetric density waves propagating through the disc is found and the criterion for the local axisymmetric stability of the whole system is formulated. In the appropriate limit of two-componen…
The SuperCOSMOS Sky Survey - III. Astrometry
Hambly, N. C.; Irwin, M. J.; MacGillivray, H. T. +1 more
In this, the third in a series of three papers concerning the SuperCOSMOS Sky Survey, we describe the astrometric properties of the data base. We describe the algorithms employed in the derivation of the astrometric parameters of the data, and demonstrate their accuracies by comparison with external data sets using the first release of data, the S…
A Hipparcos study of the Hyades open cluster. Improved colour-absolute magnitude and Hertzsprung-Russell diagrams
de Bruijne, J. H. J.; de Zeeuw, P. T.; Hoogerwerf, R.
Hipparcos parallaxes fix distances to individual stars in the Hyades cluster with an accuracy of ~ 6 percent. We use the Hipparcos proper motions, which have a larger relative precision than the trigonometric parallaxes, to derive ~ 3 times more precise distance estimates, by assuming that all members share the same space motion. An investigation …