Zobrazeno 1 - 10
of 39
pro vyhledávání: '"EVANS, NANCY R."'
Autor:
Shetye, Shreeya S., Viviani, Giordano, Anderson, Richard I., Mowlavi, Nami, Eyer, Laurent, Evans, Nancy R., Szabados, Laszlo
Publikováno v:
A&A 690, A284 (2024)
Classical Cepheids provide valuable insights into the evolution of stellar multiplicity among intermediate-mass stars. Here, we present a systematic investigation of single-lined spectroscopic binaries (SB1) based on high-precision velocities measure
Externí odkaz:
http://arxiv.org/abs/2405.19840
Autor:
Pilecki, Bogumił, Thompson, Ian B., Espinoza-Arancibia, Felipe, Hajdu, Gergely, Gieren, Wolfgang, Taormina, Mónica, Pietrzyński, Grzegorz, Narloch, Weronika, Bono, Giuseppe, Gallenne, Alexandre, Kervella, Pierre, Wielgórski, Piotr, Zgirski, Bartłomiej, Graczyk, Dariusz, Karczmarek, Paulina, Evans, Nancy R.
Publikováno v:
A&A 686, A263 (2024)
Binary Cepheids with giant companions are crucial for studying the physical properties of Cepheid variables, providing the best means to measure their masses. Systems composed of two Cepheids are even more important but to date, only one such system
Externí odkaz:
http://arxiv.org/abs/2403.12390
Cepheids have long been used as standard candles to determine distances around the Milky Way and to nearby galaxies. A discrepancy still remains for Hubble Constant determinations using Cepheids vs. the cosmic microwave background or calibrations to
Externí odkaz:
http://arxiv.org/abs/2307.12386
Rapid X-ray phase-dependent flux enhancement in the archetype classical Cepheid star $\delta$~Cep was observed by XMM-Newton and Chandra. We jointly analyse thermal and non-thermal components of the time-resolved X-ray spectra prior to, during and af
Externí odkaz:
http://arxiv.org/abs/2212.08150
Autor:
Benedict, G. Fritz, Barnes III, Thomas G., Evans, Nancy R., Cochran, William D., Anderson, Richard I., McArthur, Barbara E., Harrison, Thomas E.
The classical Cepheid eta Aql was not included in past Leavitt Law work (Benedict et al. 2007) because of a presumed complicating orbit due to a known B9.8V companion. To determine the orbit of eta Aql B, we analyze a significant number of radial vel
Externí odkaz:
http://arxiv.org/abs/2204.09759
Classical Cepheids are essential objects in the study of stellar evolution and cosmology; however, we know little about their magnetic properties. We report the detection of Stokes $V$ features interpreted as Zeeman signatures in four classical Cephe
Externí odkaz:
http://arxiv.org/abs/2204.03517
Autor:
Pilecki, Bogumił, Pietrzyński, Grzegorz, Anderson, Richard I., Gieren, Wolfgang, Taormina, Mónica, Narloch, Weronika, Evans, Nancy R., Storm, Jesper
Masses of classical Cepheids of 3 to 11 M$\odot$ are predicted by theory but those measured, clump between 3.6 and 5 M$\odot$. As a result, their mass-luminosity relation is poorly constrained, impeding our understanding of basic stellar physics and
Externí odkaz:
http://arxiv.org/abs/2102.11302
Autor:
Guzik, Joyce A., Farag, Ebraheem, Ostrowski, Jakub, Evans, Nancy R., Neilson, Hilding, Moschou, Sofia, Drake, Jeremy J.
Cepheid masses derived from pulsations or binary dynamics are generally lower than those derived from stellar evolution models. Recent efforts have been dedicated to investigating the effects of abundances, mass loss, rotation, convection and oversho
Externí odkaz:
http://arxiv.org/abs/2002.04073
Autor:
Carpenter, Kenneth G., van Belle, Gerard, Brown, Alexander, Cranmer, Steven R., Drake, Jeremy, Dupree, Andrea K., Creech-Eakman, Michelle, Evans, Nancy R., Grady, Carol A., Guinan, Edward F., Harper, Graham, Karovska, Margarita, Kolenberg, Katrien, Labeyrie, Antoine, Linsky, Jeffrey, Peters, Geraldine J., Rau, Gioia, Ridgway, Stephen, Roettenbacher, Rachael M., Saar, Steven H., Walter, Frederick M., Wood, Brian
We summarize some of the compelling new scientific opportunities for understanding stars and stellar systems that can be enabled by sub-milliarcsec (sub-mas) angular resolution, UV-Optical spectral imaging observations, which can reveal the details o
Externí odkaz:
http://arxiv.org/abs/1908.05665
Publikováno v:
Proceedings of the Polish Astronomical Society, vol. 8, pp. 88-93 (2018)
We briefly summarize the BRITE observations of classical Cepheids so far.
Comment: presented at the 3rd BRITE Science Conference, 7-10 August 2017, Auberge du Lac Taureau, QC, Canada
Comment: presented at the 3rd BRITE Science Conference, 7-10 August 2017, Auberge du Lac Taureau, QC, Canada
Externí odkaz:
http://arxiv.org/abs/1808.03100