Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Ostensen, Roy H."'
Autor:
Silvotti, Roberto, Németh, Péter, Telting, John H., Baran, Andrzej S., Østensen, Roy H., Ostrowski, Jakub, Sahoo, Sumanta K., Prins, Saskia
TIC137608661/TYC4544-2658-1/FBS0938+788 is a new sdBV+dM reflection-effect binary discovered by the TESS space mission with an orbital period of 7.21 hours. In addition to the orbital frequency and its harmonics, the Fourier transform of TIC137608661
Externí odkaz:
http://arxiv.org/abs/2201.06559
Autor:
Uzundag, Murat, Vuckovic, Maja, Nemeth, Peter, Bertolami, M. Miller, Silvotti, Roberto, Baran, Andrzej S., Telting, John H., Reed, Mike, Shoaf, K. A., Ostensen, Roy H., Sahoo, Sumanta K.
Publikováno v:
A&A 651, A121 (2021)
We present photometric and spectroscopic analyses of gravity (g-mode) long-period pulsating hot subdwarf B (sdB) stars. We perform a detailed asteroseismic and spectroscopic analysis of five pulsating sdB stars observed with {\it TESS} aiming at the
Externí odkaz:
http://arxiv.org/abs/2105.15137
In this article we present preliminary results on the upper limits to the mass of a companion for 8 apparently single subdwarf B stars, derived from high-precision radial velocity measurements obtained from Harps-N spectra. These limits, correspondin
Externí odkaz:
http://arxiv.org/abs/2002.04545
We discovered two bright DO-type white dwarfs, GALEXJ053628.3+544854 (J0536+5448) and GALEX231128.0+292935(J2311+2929), which rank among the eight brightest DO-type white dwarfs known. Our non-LTE model atmosphere analysis reveals effective temperatu
Externí odkaz:
http://arxiv.org/abs/1807.06584
Autor:
Geier, Stephan, Østensen, Roy H., Nemeth, Peter, Heber, Ulrich, Fusillo, Nicola P. Gentile, Gänsicke, Boris T., Telting, John H., Green, Elizabeth M., Schaffenroth, Johannes
In preparation for the upcoming all-sky data releases of the Gaia mission, we compiled a catalog of known hot subdwarf stars and candidates drawn from the literature and yet unpublished databases. The catalog contains 5613 unique sources and provides
Externí odkaz:
http://arxiv.org/abs/1711.01856
Publikováno v:
A&A 605, A109 (2017)
The predicted orbital-period distribution of the subdwarf-B (sdB) population is bi-modal with a peak at short (< 10 days) and long (> 500 days) periods. Observationally, many short-period sdB systems are known, but only few wide sdB binaries have bee
Externí odkaz:
http://arxiv.org/abs/1706.02286
We present an analysis of three new pulsating subdwarf B stars discovered in the SuperWASP archive. Two of the stars, J1938+5609 and J0902-0720, are p-mode pulsators; J1938+5609 shows a pulsation at 231.62 d$^{-1}$ ($P=373$ s; 2681 $\mu$Hz) with an a
Externí odkaz:
http://arxiv.org/abs/1701.02761
Publikováno v:
A&A 586, A146 (2016)
Irradiation effects in close binaries are crucial for a reliable determination of system parameters and understanding the close binary evolution. We study irradiated light originating from the low mass component of an eclipsing system comprising a ho
Externí odkaz:
http://arxiv.org/abs/1510.01790
The formation of single sdB stars is an unresolved issue and the presence of close sub-stellar companions could explain the stellar envelope ejection near the tip of the RGB, that is needed to form an sdB star. In the last 6 years the first planets o
Externí odkaz:
http://arxiv.org/abs/1406.4711
Autor:
Østensen, Roy H.
We introduce the first g-mode pulsator found to reside on the classical blue horizontal branch. We extend the original discovery dataset to include more than 3 years of continuous photometry of KIC 1718290, which reveals a rich spectrum of low-amplit
Externí odkaz:
http://arxiv.org/abs/1310.2553