Results 1 to 10 of about 261 (161)
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.
Noriyuki Matsunaga +2 more
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NEW VARIABLE STARS AROUND THE CEPHEID VARIABLE TU CAS
Publications of the Korean Astronomical Society, 2005 Time-series observations were carried out using a 155mm refractor and a CCD camera at Bohyunsan Optical Astronomy Observatory. We found 38 new variable stars in the region around the Cepheid variable TU Cas: 22 eclipsing binary stars, 11 Scuti type stars and an RR Lyrae star, and 4 unclassified variables.
Young-Beom Jeon
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The dynamical mass of a classical Cepheid variable star in an eclipsing binary system [PDF]
Nature, 2010 Stellar pulsation theory provides a means of determining the masses of pulsating classical Cepheid supergiants-it is the pulsation that causes their luminosity to vary. Such pulsational masses are found to be smaller than the masses derived from stellar evolution theory: this is the Cepheid mass discrepancy problem, for which a solution is missing.
Grzegorz Pietrzyński +2 more
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A three-dimensional map of the Milky Way using classical Cepheid variable stars [PDF]
Science, 2019 Cepheids help to map the Galaxy Cepheid variable stars pulsate, which allows their distances to be determined from the periodic variations in brightness. Skowron et al. constructed a catalog of thousands of Cepheids covering a large fraction of the Milky Way.
Dorota M Skowron, J Skowron, P Mroz
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Metallicities of Classical Cepheids in the Inner Galactic Disk
The Astrophysical Journal, 2023 Metallicity gradients refer to the sloped radial profiles of the metallicities of gas and stars and are commonly seen in disk galaxies. A well-defined metallicity gradient of the Galactic disk is observed particularly well with classical Cepheids, which ...
Noriyuki Matsunaga +16 more
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Spectroscopic Determination of Radius Changes of Cepheid Variable Stars [PDF]
Publications of the Astronomical Society of the Pacific, 2007 We introduce a simple method for determining pulsation velocities of Cepheid variables; namely, the matching of observed spectral line profiles in both shape and absolute position with model profiles. This approach avoids the ambiguous meaning of radial velocity for asymmetric lines, and it avoids the awkward projection factor (the "p" factor) used to ...
David F. Gray, Kevin B. Stevenson
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The period-luminosity relation for Cepheid variable stars
The Astrophysical Journal, 1989 Flux-constant, hydrostatic model stellar atmospheres have been calculated using effective temperatures, gravities, and abundances appropriate for Cepheid variable stars. These models have been used to compute synthetic spectra, which have been used to compute synthetic colors and the visual surface brightness parameter S(v). The Johnson system color (V-
R. B. Hindsley, R. A. Bell
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How rotation affects masses and ages of classical Cepheids
EPJ Web of Conferences, 2017 Classical Cepheid variable stars are both sensitive astrophysical laboratories and accurate cosmic distance tracers. We have recently investigated how the evolutionary effects of rotation impact the properties of these important stars and here provide an
Anderson Richard I. +4 more
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M33 Cepheids from CFHT/MegaCam Survey
The Astronomical Journal, 2022 In this paper we analyze Sloan g, r, i archival imaging data of M33 taken by Hartman et al. using MegaCam at the Canada–France–Hawaii Telescope. To determine the distance to the M33 galaxy, we performed several analytical steps to identify its Cepheid ...
Samuel Adair, Chien-Hsiu Lee
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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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