Results 101 to 110 of about 6,211 (193)

J08069+1527: A newly discovered high amplitude, hybrid subdwarf B pulsator

, 2011
We present our discovery of a new hybrid pulsating subdwarf B star, J08069+1527. The effective temperature and surface gravity of 28,500$\pm$400\,K and 5.37$\pm$0.04\,dex, respectively, place this object inside the instability strip and also among other ...
A. S. Baran, Baran, Baran, Baran, Baran, Baran, Charpinet, D'Cruz, Fontaine, Green, Han, Han, J. H. Telting, J. T. Gilker, K. Smolders, Kawaler, Kilkenny, L. Hicks, Lutz, M. D. Reed, Martin, Oreiro, R. H. Østensen, R. Oreiro, Reed, Schuh, Stetson, Vennes, Østensen, Østensen, Østensen   +30 more
core   +1 more source

Halo Stars near the Hydrogen?burning Limit: The M/L Subdwarf Transition1 [PDF]

, 2006
John E. Gizis, James Harvin, John E. Gizis, James Harvin   +3 more
openalex   +1 more source

The population of white dwarf binaries with hot subdwarf companions [PDF]

, 2015
Hot subdwarfs (sdBs) are core helium-burning stars, which lost almost their entire hydrogen envelope in the red-giant phase. Since a high fraction of those stars are in close binary systems, common envelope ejection is an important formation channel.
Barlow, B.N., Dufour, P., Geier, S., Gänsicke, B.T., Heber, U., Heuser, C., Kupfer, T., Maxted, P.F.L., Schaffenroth, V., Ziegerer, E., Østensen, R.H.   +10 more
core   +2 more sources

SLoWPoKES-II: 100,000 Wide Binaries Identified in SDSS without Proper Motions

, 2015
We present the SLoWPoKES-II catalog of low-mass visual binaries identified from the Sloan Digital Sky Survey by matching photometric distances. The candidate pairs are vetted by comparing the stellar density at their respective Galactic positions to ...
Dhital, Saurav, Massey, Angela P., Schluns, Kyle J., Stassun, Keivan G., West, Andrew A.   +4 more
core   +1 more source

Distances and Absolute Ages of Galactic Globular Clusters from Hipparcos Parallaxes of Local Subdwarfs [PDF]

, 1997
R. Gratton, F. Fusi Pecci, E. Carretta, G. Clementini, C. E. Corsi, M. G. Lattanzi   +5 more
openalex   +1 more source

An Examination of Recent Transformations to the BV(RI)_C Photometric System from the Perspective of Stellar Models for Old Stars

, 2010
Isochrones for ages > 4 Gyr and metallicities in the range -2.5 < [Fe/H] < +0.3 that take the diffusion of helium and recent advances in stellar physics into account are compared with observations in the Johnson-Cousins BV(RI)_C photometric system for ...
Bahcall, Bergbusch, Bergbusch, Bessell, Bessell, Boesgaard, Bohlin, Brasseur, Cacciari, Calamida, Caldwell, Carretta, Casagrande, Cassisi, Cayrel de Strobel, Christensen-Dalsgaard, Clem, Don A. VandenBerg, Dotter, Dotter, Edvardsson, Gratton, Kaluzny, Koch, Kučinskas, L. Casagrande, Magic, McCall, Meléndez, Meléndez, Michaud, Milone, Paulson, Peter B. Stetson, Pietrinferni, Ramírez, Reid, Rood, Sarajedini, Schlegel, Skrutskie, Stetson, Tautvaišiene, VandenBerg, VandenBerg, VandenBerg, VandenBerg, VandenBerg, VandenBerg, Weiss, Weiss, Yong   +51 more
core   +1 more source

The fastest hot subdwarfs revisited

, 2023
9 page, 6 figures, accepted for publication in Bulletin de la Societ Royale des Sciences de Liege, poceedings of the conference "10th Meeting on Hot Subdwarfs and Related Objects"
openaire   +2 more sources

X-ray emission from hot subdwarfs with compact companions

EPJ Web of Conferences, 2013
We review the X-ray observations of hot subdwarf stars. While no X-ray emission has been detected yet from binaries containing B-type subdwarfs, interesting results have been obtained in the case of the two luminous O-type subdwarfs HD 49798 and BD + 37° 
Esposito P., La Palombara N., Mereghetti S., Tiengo A.   +3 more
doaj   +1 more source

DISCOVERY OF A COMPACT COMPANION TO THE HOT SUBDWARF STAR BD +37° 442 [PDF]

, 2012
N. La Palombara, S. Mereghetti, A. Tiengo, P. Esposito   +3 more
openalex   +1 more source

ε-mechanism driven pulsations in hot subdwarf stars with mixed H-He atmospheres

Open Astronomy, 2017
The ε mechanism is a self-excitation mechanism of stellar pulsations which acts in regions where nuclear burning takes place. It has been shown that the ε mechanism can excite pulsations in hot pre-horizontal branch stars before they settle into the ...
Battich Tiara, Bertolami Marcelo M. Miller, Córsico Alejandro H., Althaus Leandro G.   +3 more
doaj   +1 more source