Results 81 to 90 of about 5,486 (209)

SUBDWARFS: ABUNDANCE OF LIGHT ELEMENTS

Odessa Astronomical Publications, 2017
CNO abundances in the atmospheres of seven metal-deficient stars were derived by model atmosphere method on the basis of high dispersion Echelle spectra obtained using the 6-m telescope of the Special Observatory of the Russian Academy of Sciences. The O
T. V. Mishenina, V. G. Klochkova, V. E. Panchuk   +2 more
doaj   +1 more source

The Arizona-Montréal Spectroscopic Survey of hot subluminous stars★

Astronomy & Astrophysics
Context. Hot subdwarf B (sdB) and O (sdO) type stars are evolved helium-burning objects that lost their hydrogen envelope before the helium flash when their progenitors were close to the tip of the red giant branch (RGB).
Latour M., Green E. M., Dorsch M., Van Grootel V., Chayer P., Charpinet S., Heber U., Randall S. K., Ma X.-Y.   +8 more
doaj   +1 more source

Ages of White Dwarf-Red Subdwarf Systems

, 2005
We provide the first age estimates for two recently discovered white dwarf-red subdwarf systems, LHS 193AB and LHS 300AB. These unusual systems provide a new opportunity for linking the reliable age estimates for the white dwarfs to the (measurable ...
Bessel M. S., Hektor Monteiro, John Subasavage, Thom Beaulieu, Todd Henry, Weidemann V., Weidemann V., Weidemann V., Wei‐Chun Jao, Wood M. A.   +9 more
core   +2 more sources

Meet the family − the catalog of known hot subdwarf stars

Open Astronomy, 2017
In preparation for the upcoming all-sky data releases of the Gaia mission, we compiled a catalog of known hot subdwarf stars and candidates drawn from the literature and yet unpublished databases.
Geier Stephan, Østensen Roy H., Nemeth Peter, Heber Ulrich, Gentile Fusillo Nicola P., Gänsicke Boris T., Telting John H., Green Elizabeth M., Schaffenroth Johannes   +8 more
doaj   +2 more sources

Kinematics of SDSS subdwarfs: Structure and substructure of the Milky Way halo

, 2009
We construct a new sample of ~1700 solar neighbourhood halo subdwarfs from the Sloan Digital Sky Survey, selected using a reduced proper motion diagram. Radial velocities come from the SDSS spectra and proper motions from the light-motion curve catalogue
Abazajian, Allende Prieto, Allende Prieto, Arnold, Belokurov, Belokurov, Binney, Bramich, Brook, Chiba, Clewley, D. B. Zucker, D. M. Bramich, de Zeeuw, Dehnen, Dinescu, Dinescu, Dotter, Eisenstein, Fellhauer, Fellhauer, Freeman, G. Gilmore, Girard, Gould, Gould, Gould, Helmi, Ibata, Ibata, Ivezić, Jurić, Kepley, Lee, Lee, M. C. Smith, M. J. Irwin, Mackey, Majewski, Mihalas, Monet, Morrison, Munn, N. W. Evans, Newberg, Norris, Odenkirchen, P. C. Hewett, Palma, S. Vidrih, Schlegel, Sesar, Smith, Smith, Soubiran, V. Belokurov, Venn, Watkins, White, Woolley, Yanny, Yanny, York   +62 more
core   +2 more sources

New Subdwarf B Star Periods [PDF]

, 2003
4 pages, 2 figures. Uses CRCKAPB.sty. To appear in the Proceedings of the XIII European Workshop on White Dwarfs. NATO Science Series II, Kluwer Academic Publishers.
Morales-Rueda, L., Maxted, P. F. L., Marsh, T. R., North, R. C.   +3 more
openaire   +2 more sources

Characterization of High Proper Motion Objects from the Wide-field Infrared Survey Explorer

, 2014
We present an analysis of high proper motion objects that we have found in a recent study and in this work with multi-epoch astrometry from the Wide-field Infrared Survey Explorer (WISE).
Luhman, K. L., Sheppard, Scott S.
core   +1 more source

Classification of Metal-Deficient Dwarfs in the Vilnius Photometric System

Open Astronomy, 2003
Methods used for the quantitative classification of metal-deficient stars in the Vilnius photometric system are reviewed. We present a new calibration of absolute magnitudes for dwarfs and subdwarfs, based on Hipparcos parallaxes.
Lazauskaitė R., Bartkevičius A., Bartašiūtė S.   +2 more
doaj   +1 more source

ON THE OBSERVED PHYSICAL PROPERTIES AND EVOLUTIONARY TRENDS OF HOT SUBDWARFS IN BINARY SYSTEMS

Odessa Astronomical Publications, 2017
In our brief review we summarize the latest advances in studies of white dwarfs both as single objects and the components of binary systems. We discuss the observed properties of the hot subdwarfs (sdws), the various techniques of their discovery and ...
I. Pustylnik
doaj   +1 more source

Hot subluminous stars: Highlights from the MUCHFUSS and Kepler missions

EPJ Web of Conferences, 2013
Research into hot subdwarf stars is progressing rapidly. We present recent important discoveries. First we review the knowledge about magnetic fields in hot subdwarfs and highlight the first detection of a highly-magnetic, helium-rich sdO star.
Geier S., Heber U., Gaensicke B.
doaj   +1 more source