Results 61 to 70 of about 6,211 (193)

MAGNETISM OF WHITE DWARFS (intermediate results of a survey for kilogauss magnetic fields in white dwarfs)

Odessa Astronomical Publications, 2017
We shortly present intermidiate results of a survey for weak magnetic fields among degenerate stars (white dwarfs and hot subdwarf stars). Kilogauss upper limits of longitudinal magnetic fields are presented for several brightest DA white dwarfs and new ...
G. Valyavin, S. Bagnulo, S. Fabrika, A. Reisenegger, G. A. Wade, Inwoo Han, D. Monin   +6 more
doaj   +1 more source

The Schizophrenic Spectrum of LSR 1610-0040: a Peculiar M Dwarf/Subdwarf

, 2005
We present a moderate resolution (R=2000), 0.8-4.1 micron spectrum of LSR 1610-0040, a high proper motion star classified as an early-type L subdwarf by Lepine and collaborators based on its red-optical spectrum.
Bessell M., Epchtein N., Michael C. Cushing, Sandage A., William D. Vacca   +4 more
core   +2 more sources

Distances, ages, and epoch of formation of globular clusters [PDF]

, 1999
We review the results on distances and absolute ages of galactic globular clusters (GCs) obtained after the release of the Hipparcos catalogue. Several methods for the Population II local distance scale are discussed, exploiting NEW RESULTS for RR Lyraes
Arenou F., Axer M., Bessel M. S., Buonanno R., Caldwell J. A. R., Caloi V., De Marchi G., Eugenio Carretta, Fahlman G. G., Feast M. W., Feast M. W., Fernley J., Fernley J., Ferraro F., Fischer P., Flavio Fusi Pecci, Fuhrmann K., Gisella Clementini, Gratton R. G., Gratton R. G., Hanson R. B., Laney C. D., Laney C. D., Lindgren L., Lynga G., Madau P., Oestreicher M. O., Pandey A. K., Penny A. J., Pont F., Raffaele G. Gratton, Schuster W. J., Skillen I., Storm J., Turner M. S., Udalski A., Udalski A., Van Leeuwen F., Wesselink A. J., Zhao G.   +39 more
core   +2 more sources

COOL SUBDWARF INVESTIGATIONS. I. NEW THOUGHTS ON THE SPECTRAL TYPES OF K AND M SUBDWARFS [PDF]

The Astronomical Journal, 2008
Using new spectra of 88 K and M-type subdwarfs, we consider novel methods for assigning their spectral types and take steps toward developing a comprehensive spectral sequence for subdwarf types K3.0 to M6.0. The types are assigned based on the overall morphology of spectra covering 6000 to 9000 .
Jao, Wei-Chun, Henry, Todd J., Beaulieu, Thomas D., Subasavage, John P.   +3 more
openaire   +2 more sources

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

Identification of blue high proper motion objects in the Tycho-2 and 2MASS catalogues using Virtual Observatory tools

, 2010
With available Virtual Observatory tools, we looked for new bright blue high proper motion objects in the entire sky: white dwarfs, hot subdwarfs, runaway OB stars, and early-type stars in nearby young moving groups.
Baschek, Baschek, Berger, Berger, Bonifacio, Bonnarel, Brown, Caballero, Carnochan, Castelli, Conlon, Crook, Drilling, E. Solano, Edelmann, Epchtein, F. M. Jiménez-Esteban, Feige, Giclas, Giclas, Gould, Greenstein, Greenstein, Greenstein, Hambly, Haro, Holberg, Hoogerwerf, Humason, Høg, J. A. Caballero, Kapteyn, Kilkenny, Luyten, Luyten, Lépine, Martin, McCook, Monet, Ofek, Oke, Oke, O’Toole, Perryman, Pickering, Rucinski, Röser, Schwartz, Sion, Skrutskie, Stephenson, Stone, Thackeray, Urban, van Albada, van Leeuwen, Voûte, Zuckerman   +57 more
core   +1 more source

Galactic Globular and Open Clusters in the Sloan Digital Sky Survey. II. Test of Theoretical Stellar Isochrones [PDF]

, 2009
We perform an extensive test of theoretical stellar models for main-sequence stars in ugriz, using cluster fiducial sequences obtained in the previous paper of this series.
Abazajian, Abazajian, Abazajian, Adelman-McCarthy, Adelman-McCarthy, Adelman-McCarthy, Alonso, An, An, An, Bahcall, Bessell, Carraro, Carretta, Castelli, Castelli, Chaboyer, Chaboyer, Chaboyer, Chaboyer, Clem, Clem, Davis, De Angeli, Delahaye, Deokkeun An, Donald M. Terndrup, Dotter, Dunkley, Eggen, Eisenstein, ESA., Fornal, Franck Delahaye, Gratton, Gratton, Gunn, Gunn, Hansen, Hauschildt, Hogg, Holberg, Inese I. Ivans, Ivezic, Ivezić, Jennifer A. Johnson, Jensen, Jimenez, Jurić, Kim, Kirby, Korn, Kraft, Lupton, Marc H. Pinsonneault, Michaud, Origlia, Pier, Pinsonneault, Pinsonneault, Reid, Renzini, Renzini, Rider, Rogers, Rosenberg, Schlegel, Sills, Smith, Spergel, Stoughton, Straniero, Thomas Masseron, Timothy C. Beers, VandenBerg, VandenBerg, VandenBerg, Venn, York, Zoccali, Željko Ivezić   +80 more
core   +3 more sources

COOL SUBDWARF INVESTIGATIONS. II. MULTIPLICITY [PDF]

The Astronomical Journal, 2009
accepted by ...
Jao, Wei-Chun, Mason, Brian D., Hartkopf, William I, Henry, Todd J., Ramos, Stephanie N.   +4 more
openaire   +2 more sources

Purple dwarfs: New L subdwarfs from UKIDSS and SDSS

EPJ Web of Conferences, 2013
The first L subdwarf was a discovered only ten years ago. Less than ten L subdwarfs been published in the literature to date. Metal-poor ultracool atmospheres has not been well understood.
Marocco F., Day-Jones A.C., Jones H.R.A., Burningham B., Pinfield D.J., Zhang Z.H., Gomes J., Galvez-Ortiz M.C.   +7 more
doaj   +1 more source

A FEROS Survey of Hot Subdwarf Stars

Open Astronomy, 2018
We have completed a survey of twenty-two ultraviolet-selected hot subdwarfs using the Fiber-fed Extended Range Optical Spectrograph (FEROS) and the 2.2-m telescope at La Silla. The sample includes apparently single objects as well as hot subdwarfs paired
Vennes Stéphane, Németh Péter, Kawka Adela   +2 more
doaj   +1 more source