Results 81 to 90 of about 6,211 (193)

Spectral analysis of the He-enriched sdO-star HD 127493

Open Astronomy, 2018
The bright sdO star HD127493 is known to be of mixed H/He composition and excellent archival spectra covering both optical and ultraviolet ranges are available.
Dorsch Matti, Latour Marilyn, Heber Ulrich   +2 more
doaj   +1 more source

Hot subdwarf stars in close-up view - II. Rotational properties of single and wide binary subdwarf B stars

, 2012
Subluminous B stars (sdBs) form the extremely hot end of the horizontal branch and are therefore related to the blue horizontal branch (BHB) stars. While the rotational properties of BHB stars have been investigated extensively, studies of sdB stars have
Bear, Behr, Behr, Behr, Behr, Berger, Billères, Billères, Blanchette, Brown, Caloi, Carney, Carney, Charpinet, Charpinet, Charpinet, Charpinet, Charpinet, Copperwheat, de Marchi, Deca, Dorman, D’Cruz, Edelmann, Edelmann, Eisenstein, Fabbian, Fontaine, For, Geier, Geier, Geier, Geier, Geier, Geier, Geier, Gourgouliatos, Green, Green, Green, Grundahl, Han, Han, Han, Han, Heber, Heber, Heber, Heber, Hirsch, Iben, Jeffery, Kawaler, Kilkenny, Kilkenny, Kinman, Koen, Lemke, Lisker, Marietta, Maxted, Maxted, Mengel, Michaud, Michaud, Morales-Rueda, Napiwotzki, Napiwotzki, Napiwotzki, Napiwotzki, Napiwotzki, O’Donoghue, Pace, Peterson, Peterson, Peterson, Peterson, Politano, Przybilla, Quievy, Randall, Recio-Blanco, Recio-Blanco, S. Geier, Saffer, Sills, Silvotti, Soker, Ströer, Sweigart, Telting, U. Heber, Unglaub, van Grootel, van Grootel, Vink, Webbink, Østensen, Østensen   +98 more
core   +1 more source

GALEX J201337.6+092801: The lowest gravity subdwarf B pulsator [PDF]

, 1998
We present the recent discovery of a new subdwarf B variable (sdBV), with an exceptionally low surface gravity. Our spectroscopy of J20136+0928 places it at Teff = 32100 +/- 500, log(g) = 5.15 +/- 0.10, and log(He/H) = -2.8 +/- 0.1. With a magnitude of B
A, A Arabia, A Arabia, A Bialynicki-Birula, A Borel, A Grothendieck, B Kostant, C, C Concini, D Edidin, D Eisenbud, D Husemoller, D Kazhdan, E Bifet, F Kirwan, H Gillet, H Hopf, J Carrell, K Kawakubo, M Audin, M Brion, M Brion, M Brion, M Goresky, MF Atiyah, N Bourbaki, P Iglesias, R, R. Bott, S. Kumar, T Chang, V Deodhar, V Deodhar, V Guillemin, V Mehta, W Fulton, W Fulton, WY Hsiang   +37 more
core   +1 more source

Concluding remarks

EPJ Web of Conferences, 2013
Precision asteroseismic observations with the Kepler and CoRot satellites enable the internal structure and evolution of pulsating stars to be more exhaustively studied than has hitherto been possible.
Lynas-Gray A.E.
doaj   +1 more source

Close-In Substellar Companions and the Formation of sdB-Type Close Binary Stars

Acta Polytechnica CTU Proceedings, 2015
The sdB-type close binaries are believed to have experienced a common-envelope phase and may evolve into cataclysmic binaries (CVs). About 10% of all known sdB binaries are eclipsing binaries consisting of very hot subdwarf primaries and low-mass ...
L. Y. Zhu, S. B. Qian, E.-G. Zhao, E. Fernández Lajús, Z.-T. Han   +4 more
doaj   +1 more source

Two new hot subdwarf binaries in the GALEX survey

, 2010
We report the discovery of two new hot, hydrogen-rich subdwarfs (sdB) in close binary systems. The hot subdwarfs, GALEX J0321+4727 and GALEX J2349+3844, were selected from a joint optical-ultraviolet catalogue of hot sub-luminous stars based on GSC2.3.2 ...
A. Kawka, Ahmad, Cardelli, D'Cruz, Dorman, Edelmann, For, Han, Han, Heber, Heber, Heber, Heckmann, Hubeny, Høg, J. Kubát, Kirkpatrick, Lanz, M. Kraus, Maxted, Maxted, Maxted, Mengel, Mermilliod, Mickaelian, Morales-Rueda, Morrissey, O'Toole, Ochsenbein, P. Németh, Perryman, Press, S. Vennes, Schlegel, Skrutskie, Van Leeuwen, Woźniak, Zacharias, Šlechta   +38 more
core   +1 more source

Tidal Spin-up of Subdwarf B Stars

The Astrophysical Journal
Hot subdwarf B (sdB) stars are stripped helium-burning stars that are often found in close binaries, where they experience strong tidal interactions. The dissipation of tidally excited gravity waves alters their rotational evolution throughout the sdB ...
Linhao Ma, Jim Fuller
doaj   +1 more source

News From The Erebos Project

Open Astronomy, 2017
Planets and brown dwarfs in close orbits will interact with their host stars, as soon as the stars evolve to become red giants. However, the outcome of those interactions is still unclear.
Schaffenroth Veronika, Barlow Brad, Geier Stephan, Vučković Maja, Kilkenny Dave, Schaffenroth Johannes   +5 more
doaj   +1 more source

Discovery of a rapidly pulsating subdwarf B star candidate in omega Cen

, 2008
We report the discovery of the first variable extreme horizontal branch star in a globular cluster (omega Cen). The oscillation uncovered has a period of 114 s and an amplitude of 32 mmags.
A. Calamida, Bedin, Brown, Calamida, Castellani, Castellani, Castellani, Charpinet, Charpinet, Charpinet, D'Antona, D'Antona, D'Cruz, Del Principe, G. Bono, Greggio, Han, Han, Han, Heber, Kilkenny, Lee, Moni Bidin, Napiwotzki, Oreiro, Pietrinferni, Piotto, Reed, S. K. Randall, Stetson, Stetson, Stetson, Stetson, van Grootel   +33 more
core   +1 more source

A survey of hot subdwarf pulsators in ω Cen

EPJ Web of Conferences, 2013
We recently discovered an apparently new class of pulsating Extreme Horizontal Branch (EHB) star in ω Cen. Tightly clustered around ∼50,000 K, these H-rich sdO stars exhibit rapid, multi-periodic oscillations on a timescale of 100 s.
Catelan M., Monelli M., Alonso M.L., Green E.M., Fontaine G., Calamida A., Randal S.K., Bono G., Dhillon V.S., Marsh T.R.   +9 more
doaj   +1 more source