Results 61 to 70 of about 3,864 (175)

Resolving the pulsations of the subdwarf B star KPD 2109 + 4401 [PDF]

Monthly Notices of the Royal Astronomical Society, 2006
8 pages, 4 figures, 5 tables; Accepted for publication in ...
Zhou, A.-Y., Reed, M. D., Harms, S., Terndrup, D. M., An, D., Zoła, Stanisław, Gazeas, K. D., Niarchos, P. G., Ogloza, W., Baran, A., Wolf, G. W.   +10 more
openaire   +4 more sources

EXOTIME: searching for planets around pulsating subdwarf B stars [PDF]

Astrophysics and Space Science, 2010
Contribution to: The Fourth Meeting on Hot Subdwarf Stars and Related Objects, 20 - 24 July 2009, Shanghai, China, published 03/2010 by Ap&SS (Open access publication).
Schuh, Sonja, Silvotti, Roberto, Lutz, Ronny, Loeptien, Bjorn, Green, Elizabeth M., Ostensen, Roy H., Leccia, Silvio, Kim, Seung-Lee, Fontaine, Gilles, Charpinet, Stéphane, Francoeur, Myriam, Randall, Suzanna, Rodriguez-Lopez, Cristina, Van Grootel, Valérie, Odell, Andrew P., Paparo, Margit, Bognar, Zsofia, Papics, Peter, Nagle, Thorsten, Beeck, Benjamin, Hundertmark, Markus, Stahn, Thorsten, Dreizler, Stefan, Hessman, Frederic V., Dall'Ora, Massimo, Mancini, Dario, Cortecchia, Fausto, Benatti, Serena, Claudi, Riccardo, Janulis, Rimvydas   +29 more
openaire   +4 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

A Target or the Next XCov23 Campaign: KPD 1930+2752

Open Astronomy, 2003
KPD 1930+2752 is a pulsating subdwarf B star with a particularly rich period spectrum, likely due to significant rotational splitting. It is also a short period (~ 2h17m), close binary system (as revealed by the presence of an ellipsoidal variation in ...
Charpinet S., Reed M.D.
doaj   +1 more source

A Radial Velocity Study of Composite-Spectra Hot Subdwarf Stars with the Hobby-Eberly Telescope

, 2012
Many hot subdwarf stars show composite spectral energy distributions indicative of cool main sequence companions. Binary population synthesis (BPS) models demonstrate such systems can be formed via Roche lobe overflow or common envelope evolution but ...
Berger, Brad N. Barlow, Clausen, Clausen, Cumming, Debes, Dermine, Green, Green, Hans Van Winckel, Haro, Heber, Kilkenny, Koen, Nelemans, Nidever, Press, Richard A. Wade, Roy H. Østensen, Saar, Sandra E. Liss, Soker, Stark, Wang, Wright, Østensen, Østensen, Østensen   +27 more
core   +1 more source

Radial Velocity Confirmation of a Binary Detected from Pulse Timings [PDF]

, 2011
A periodic variation in the pulse timings of the pulsating hot subdwarf B star CS 1246 was recently discovered via the O-C diagram and suggests the presence of a binary companion with an orbital period of two weeks.
Barlow, Brad N., Clemens, J. Christopher, Dunlap, Bart H.   +2 more
core   +3 more sources

Rotation Signatures of TESS B-type Stars: Enlarging the Sample

The Astrophysical Journal
Massive stars are essential for the evolution and chemical enrichment of the universe, yet their structure and evolution remain poorly understood. This study aims to expand the sample of B-type stars with known rotation periods by analyzing NASA’s ...
J. P. S. Campelo, B. L. Canto Martins, I. C. Leão, D. O. Fontinele, R. L. Gomes, Y. S. Messias, E. Janot-Pacheco, L. A. Almeida, A. C. Brito, C. E. Ferreira Lopes, J. R. De Medeiros   +10 more
doaj   +1 more source

Hot subdwarf stars from the Hamburg Quasar Survey

Astronomy & Astrophysics
Hot subluminous stars (subdwarf B&O; sdB, sdO) are evolved low mass stars originating from red giants that lost their envelope almost entirely. The multitude of observed phenomena imply that several pathways may form hot subdwarfs, most involving close ...
Heber U., Kufleitner L., Dorsch M., Latour M., Dawson H., Mattig F., Geier S.   +6 more
doaj   +1 more source

Wolf 1130: A Nearby Triple System Containing a Cool, Ultramassive White Dwarf [PDF]

, 2018
Following the discovery of the T8 subdwarf WISEJ200520.38+542433.9 (Wolf 1130C), with common proper motion to a binary (Wolf 1130AB) consisting of an M subdwarf and a white dwarf, we set out to learn more about the old binary in the system.
Gosnell, Natalie M., Jaffe, Daniel, Kidder, Benjamin, Kim, Hwihyun, Kirkpatrick, Davy, Mace, Gregory N., Mann, Andrew W., Mulligan, Brian W., Prato, L., Schneider, Adam C., Skiff, Brian A., Sneden, Christopher   +11 more
core   +3 more sources

Distances, ages, and epoch of formation of globular clusters [PDF]

, 1999
We review the results on distances and absolute ages of galactic globular clusters (GCs) obtained after the release of the Hipparcos catalogue. Several methods for the Population II local distance scale are discussed, exploiting NEW RESULTS for RR Lyraes
Arenou F., Axer M., Bessel M. S., Buonanno R., Caldwell J. A. R., Caloi V., De Marchi G., Eugenio Carretta, Fahlman G. G., Feast M. W., Feast M. W., Fernley J., Fernley J., Ferraro F., Fischer P., Flavio Fusi Pecci, Fuhrmann K., Gisella Clementini, Gratton R. G., Gratton R. G., Hanson R. B., Laney C. D., Laney C. D., Lindgren L., Lynga G., Madau P., Oestreicher M. O., Pandey A. K., Penny A. J., Pont F., Raffaele G. Gratton, Schuster W. J., Skillen I., Storm J., Turner M. S., Udalski A., Udalski A., Van Leeuwen F., Wesselink A. J., Zhao G.   +39 more
core   +2 more sources