Results 21 to 30 of about 399 (192)
Period–Luminosity Relations for Galactic Classical Cepheids in the Sloan Bands
The Astrophysical Journal, 2023 We present the first period–luminosity (PL) and period–Wesenheit (PW) relations in the Sloan–Pan-STARRS g _P _1 r _P _1 i _P _1 bands for classical fundamental-mode Cepheids in the Milky Way.
Weronika Narloch +8 more
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Nonthermal X-Rays from Pulsation-driven Shocks in Cepheids
The Astrophysical Journal, 2023 Rapid X-ray phase-dependent flux enhancement in the archetype classical Cepheid star δ Cep was observed by XMM-Newton and Chandra. We jointly analyze thermal and nonthermal components of the time-resolved X-ray spectra prior to, during, and after the ...
Federico Fraschetti +3 more
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Highlights on eclipsing binary variables from Araucaria Project
EPJ Web of Conferences, 2015 The Araucaria Project, which main goal is to provide precise determination of the cosmic distance scale, has recently made a set of discoveries involving variable stars in binary systems. Among these discoveries we highlight three: 1% precise measurement
Karczmarek Paulina +10 more
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The Astrophysical Journal, 2023 Because of their period–luminosity relation (PLR), classical Cepheids play a key role in the calibration of the extragalactic distance scale and the determination of the Hubble–Lemaître constant H _0 .
Paulina Karczmarek +7 more
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The Astrophysical Journal Letters, 2023 Milky Way Cepheid variables with accurate Hubble Space Telescope photometry have been established as standards for primary calibration of the cosmic distance ladder to achieve a percent-level determination of the Hubble constant ( H _0 ).
Anupam Bhardwaj +12 more
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Faint (and bright) variable stars in the satellites of the Milky Way
EPJ Web of Conferences, 2017 I describe two ongoing projects related with variable stars in the satellites of the MilkyWay. In the first project, we are searching for dwarf Cepheid stars (a.k.a δ Scuti and/or SX Phe) in some of the classical dwarf spheroidal galaxies. Our goal is to
Vivas A. Katherina
doaj +1 more source
Frontiers in Astronomy and Space Sciences, 2021 Using our non-local and time-dependent theory of convection and a fixed set of convective parameters (C1, C2/C1 , C3)= (0.70, 0.50, 3.0) calibrated against the Sun, the linear non-adiabatic oscillations for evolutionary models with masses 1–20 M ...
Da-run Xiong
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Three classical Cepheid variable stars in the nuclear bulge of the Milky Way [PDF]
Nature, 2011 The nuclear bulge is a region with a radius of about 200 parsecs around the centre of the Milky Way. It contains stars with ages ranging from a few million years to over a billion years, yet its star-formation history and the triggering process for star formation remain to be resolved.
Matsunaga, N. +8 more
openaire +3 more sources
Discovery of the Longest-period Classical Cepheid in the Milky Way
The Astrophysical Journal LettersWe report the discovery of the classical Cepheid OGLE-GD-CEP-1884 (= GDS_J1535467-555656) with the longest pulsation period known in our Galaxy. The period of 78.14 days is nearly 10 days longer than that of the previous record-holding Cepheid, S ...
I. Soszyński +14 more
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Stewardship of Molecular Diagnostics in Transplant Viral Infections
Transplant Infectious Disease, EarlyView.ABSTRACT The transplant environment requires special considerations when testing for viral infections as immunosuppression results in atypical infection profiles. Microbes otherwise considered commensals or causing mild disease can lead to severe infections in transplant environments. Therefore, guidelines tend to recommend broader microbial testing in
Scott Sugden +3 more
wiley +1 more source