Results 11 to 20 of about 7,790 (232)

COOL SUBDWARF INVESTIGATIONS. III. DYNAMICAL MASSES OF LOW-METALLICITY SUBDWARFS [PDF]

The Astronomical Journal, 2016
ABSTRACT We report dynamical mass measurements for the components of the previously known double-lined spectroscopic subdwarfs G 006-026 B and C using the Fine Guidance Sensors on the Hubble Space Telescope. To build the empirical mass–luminosity relation for low-metallicity subdwarfs, we collect four other subdwarf systems with ...
Wei-Chun 饒惟君 Jao, Edmund P. Nelan, Todd J. Henry, Otto G. Franz, Lawrence H. Wasserman   +4 more
openaire   +4 more sources

Ages of White Dwarf-Red Subdwarf Systems

The Astrophysical Journal, 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   +3 more sources

A New Sample of Cool Subdwarfs from SDSS: Properties and Kinematics [PDF]

, 2014
We present a new sample of M subdwarfs compiled from the 7th data release of the Sloan Digital Sky Survey. With 3517 new subdwarfs, this new sample significantly increases the number of spectroscopically confirmed low-mass subdwarfs.
Andrew A. West, Antonia S. Savcheva, Bessell, Binney, Bochanski, Bochanski, Bochanski, Boeshaar, Burgasser, Costa, Covey, Dhital, Espinosa Contreras, Faherty, Fuchs, Gizis, Ivezić, Jao, Jao, Jao, John J. Bochanski, Kirkpatrick, Kirkpatrick, Kowalski, Laughlin, Luyten, Lépine, Lépine, Lépine, Lépine, Lépine, Mann, Monteiro, Morgan, Munn, Munn, Murray, Reid, Reid, Schlegel, Schmidt, Skrutskie, Subasavage, Subasavage, West, West, West, West, York   +48 more
core   +5 more sources

Subaru and Salt Spectroscopy of Chemically Peculiar Hot Subdwarfs

Open Astronomy, 2017
The majority of hot subdwarfs lie on or close to the helium main-sequence. Many have hydrogen-rich surfaces, but a substantial fraction of the hotter subdwarfs have hydrogen-depleted or hydrogen-deficient surfaces. Amongst the former, three were known to
Jeffery C. Simon, Neelamkodan Naslim, Woolf Vincent M., Crawford Steven M., Østensen Roy H.   +4 more
doaj   +2 more sources

New ultracool subdwarfs identified in large-scale surveys using Virtual Observatory tools: II. SDSS DR7 vs UKIDSS LAS DR6, SDSS DR7 vs UKIDSS LAS DR8, SDSS DR9 vs UKIDSS LAS DR10, and SDSS DR7 vs 2MASS [PDF]

, 2016
We aim at developing an efficient method to search for late-type subdwarfs (metal-depleted dwarfs with spectral types >M5) to improve the current statistics.
Aberasturi, M., Contreras, M. Espinoza, Lodieu, N., Martin, E. L., Osorio, M. R. Zapatero, Rodrigo, C., Solano, E.   +6 more
core   +2 more sources

Accurate mass and radius determinations of a cool subdwarf in an eclipsing binary. [PDF]

Nat Astron, 2019
Rebassa-Mansergas A, Parsons SG, Dhillon VS, Ren J, Littlefair SP, Marsh TR, Torres S.   +6 more
europepmc   +3 more sources

PRELIMINARY ABUNDANCE ANALYSIS OF 9 SUBDWARFS

Odessa Astronomical Publications, 2017
We provide parameter and abundance determination of 9 subwarfs including two SMR stars (HD 161797 and HD 182572). These stars show metallicity overabundance in agreement with previous results.
T. V. Mishenina, T. I. Gorbaneva, L. E. Kantsen   +2 more
doaj   +2 more sources

CCD Parallaxes for 309 Late-type Dwarfs and Subdwarfs [PDF]

, 2017
New, updated, and/or revised CCD parallaxes determined with the Strand Astrometric Reflector at the Naval Observatory Flagstaff Station (NOFS) are presented. Included are results for 309 late-type dwarf and subdwarf stars observed over the 30+ years that
Ables, Harold D., Canzian, Blaise J., Dahn, Conard C., Guetter, Harry H., Harris, Fred H., Harris, Hugh C., Henden, Arne H., Leggett, S. K., Levine, Stephen E., Luginbuhl, Christian B., Monet, Alice B., Monet, David G., Munn, Jeffrey A., Pier, Jeffrey R., Stone, Ronald C., Subasavage, John P., Tilleman, Trudy M., Vrba, Frederick J., Walker, Richard L.   +18 more
core   +2 more sources

Some Subdwarf Models

, 1962
In this paper we present the results obtained from the numerical integration of the equations for the case of subdwarfs with masses comparable and somewhat larger than that of the Sun.
Carlos M. Varsavsky, F. T. Gratton, W. G. L. Pöppel   +2 more
openalex   +2 more sources

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   +2 more sources