253 citations · 1k across the 25 of their papers we have counts for
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Identification of new hot subdwarf binary systems by means of Virtual Observatory tools
E. Solano, A. Ulla, E. Pérez-Fernández +7
The estimation of the binary fraction of hot subdwarfs is key to shed light on the different evolution scenarios proposed to explain the loss of the hydrogen envelope during the re…
The CARMENES search for exoplanets around M dwarfs: High-resolution optical and near-infrared spectroscopy of 324 survey stars
A. Reiners, M. Zechmeister, J. A. Caballero +170
The CARMENES radial velocity (RV) survey is observing 324 M dwarfs to search for any orbiting planets. In this paper, we present the survey sample by publishing one CARMENES spectr…
A search for new hot subdwarf stars by means of Virtual Observatory tools II
Esther Pérez-Fernández, Ana Ulla, Enrique Solano +2
Recent massive sky surveys in different bandwidths are providing new opportunities to modern astronomy. The Virtual Observatory (VO) represents the adequate framework to handle the…
The physical structure of planetary nebulae around sdO stars: Abell36, DeHt2, and RWT152
A. Aller, L. F. Miranda, L. Olguín +5
We present narrow-band Halpha and [OIII] images, and high-resolution, long-slit spectra of the planetary nebulae (PNe) Abell36, DeHt2, and RWT152 aimed at studying their morphology…
Detection of solar-like oscillations in the bright red giant stars Psc and Tau from a 190-day high-precision spectroscopic multisite campaign
P. G. Beck, E. Kambe, M. Hillen +35
Red giants are evolved stars which exhibit solar-like oscillations. Although a multitude of stars have been observed with space telescopes, only a handful of red-giant stars were t…
Detection of a multi-shell planetary nebula around the hot subdwarf O-type star 2MASS J19310888+4324577
A. Aller, L. F. Miranda, A. Ulla +8
(Abridged) The origin of hot subdwarf O-type stars (sdOs) remains unclear since their discovery in 1947. Among others, a post-Asymptotic Giant Branch (post-AGB) origin is possible…
Rule or exception? Planetary nebulae around hot subdwarf stars
A. Aller, L. F. Miranda, A. Ulla +4
In this work, we present the first results of an ongoing survey to search for planetary nebulae (PNe) around hot subdwarf stars (sdOs). Deep images and intermediate-resolution long…
Orbital properties of an unusually low-mass sdB star in a close binary system with a white dwarf
R. Silvotti, R. H. Østensen, S. Bloemen +17
We have used 605 days of photometric data from the Kepler spacecraft to study KIC 6614501, a close binary system with an orbital period of 0.15749747(25) days (3.779939 hours), tha…
Angular momentum transfer between oscillations and rotation in subdwarf B hybrid pulsators
Fernando Pérez Hernández, Raquel Oreiro, Haili Hu
Context. Subdwarf B pulsators exhibit pressure (p) and/or gravity (g) modes. Their frequency spectra range from very simple, with few frequencies, to very rich, with more than fift…
CoRoT observations of O stars: diverse origins of variability
R. Blomme, M. Briquet, P. Degroote +26
Six O-type stars were observed continuously by the CoRoT satellite during a 34.3-day run. The unprecedented quality of the data allows us to detect even low-amplitude stellar pulsa…
GALEX J201337.6+092801: The lowest gravity subdwarf B pulsator
Roy H Østensen, Peter I Pápics, Raquel Oreiro +8
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, l…
A search for new hot subdwarf stars by means of Virtual Observatory tools
R. Oreiro, C. Rodríguez-López, E. Solano +3
Hot subdwarf stars are faint, blue objects, and are the main contributors to the far-UV excess observed in elliptical galaxies. They offer an excellent laboratory to study close an…
J08069+1527: A newly discovered high amplitude, hybrid subdwarf B pulsator
A. S. Baran, J. T. Gilker, M. D. Reed +5
We present our discovery of a new hybrid pulsating subdwarf B star, J08069+1527. The effective temperature and surface gravity of 28,500400\,K and 5.370.04\,dex, respecti…
An asteroseismic study of the O9V star HD 46202 from CoRoT space-based photometry
M. Briquet, C. Aerts, A. Baglin +13
The O9V star HD 46202, which is a member of the young open cluster NGC 2244, was observed by the CoRoT satellite in October/November 2008 during a short run of 34 days. From the ve…
2M1938+4603: A rich, multimode pulsating sdB star with an eclipsing dM companion observed with Kepler
R. H. Østensen, E. M. Green, S. Bloemen +16
2M1938+4603 (KIC 9472174) displays a spectacular light curve dominated by a strong reflection effect and rather shallow, grazing eclipses. The orbital period is 0.126 days, the sec…
Detection of frequency spacings in the young O-type binary HD 46149 from CoRoT photometry
P. Degroote, M. Briquet, M. Auvergne +15
Using the CoRoT space based photometry of the O-type binary HD46149, stellar atmospheric effects related to rotation can be separated from pulsations, because they leave distinct s…
Periodic mass loss episodes due to an oscillation mode with variable amplitude in the hot supergiant HD50064
C. Aerts, K. Lefever, A. Baglin +15
We aim to interpret the photometric and spectroscopic variability of the luminous blue variable supergiant HD\,50064 ().CoRoT space photometry and follow-up high-resolution…
Constraining the degree of the dominant mode in QQ Vir
Andrzej Baran, John Telting, Roy Ostensen +9
We present early results of the application of a method which uses multicolor photometry and spectroscopy for \ell discrimination. This method has been successfully applied to the…
Study of sdO models. Pulsation Analysis
C. Rodríguez-López, A. Moya, R. Garrido +3
We have explored the possibility of driving pulsation modes in models of sdO stars in which the effects of element diffusion, gravitational settling and radiative levitation have b…