1,001 research outputs found
Organisationsstrukturen der Wirtschaft und Ihre Anforderungen an die Informations- und Kommunikationstechnik
Analyse- und Gestaltungskonzepte für das Outsourcing der betrieblichen Informationsverarbeitung
Archiv für Religionspsychologie. Band 8 / hrsg. von Wilhelm Keilbach. - Göttingen: Vandenhoeck & Ruprecht, 1964
Mynarek, Hubertus: Mensch und Sprache : über Ursprung und Wesen der Sprache in ihrer anthropologischen Valenz. - Freiburg u.a.: Herder, 1967
Liv. Erst- und Kurländer auf der alten Universität Strassburg
http://tartu.ester.ee/record=b2173510~S1*es
The Century Survey Galactic Halo Project II: Global Properties and the Luminosity Function of Field Blue Horizontal Branch Stars
We discuss a 175 deg^2 spectroscopic survey for blue horizontal branch (BHB)
stars in the Galactic halo. We use the Two Micron All Sky Survey (2MASS) and
the Sloan Digital Sky Survey (SDSS) to select BHB candidates, and find that the
2MASS and SDSS color-selection is 38% and 50% efficient, respectively, for BHB
stars. Our samples include one likely run-away B7 star 6 kpc below the Galactic
plane. The global properties of the BHB samples are consistent with membership
in the halo population: the median metallicity is [Fe/H]=-1.7, the velocity
dispersion is 108 km/s, and the mean Galactic rotation of the BHB stars
3<|z|<15 kpc is -4 +- 30 km/s. We discuss the theoretical basis of the Preston,
Shectman & Beers M_V-color relation for BHB stars, and conclude that intrinsic
shape of the BHB M_V-color relation results from the physics of stars on the
horizontal branch. We calculate the luminosity function for the field BHB star
samples using the Efstathiou, Ellis, & Peterson maximum-likelihood method which
is unbiased by density variations. The field BHB luminosity function exhibits a
steep rise at bright luminosities, a peak between 0.8 < M_V < 1.0, and a tail
at faint luminosities. We compare the field BHB luminosity functions with the
luminosity functions derived from sixteen different globular cluster BHBs.
Kolmogorov-Smirnov tests suggest that field BHB stars and BHB stars in globular
clusters share a common distribution of luminosities, with the exception of
globular clusters with extended BHBs.Comment: 14 pages, including 16 figures, accepted for publication in A
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