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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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Bayesian Nonparametric Shrinkage Applied to Cepheid Star Oscillations. [PDF]
Stat Sci, 2012 Bayesian nonparametric regression with dependent wavelets has dual shrinkage properties: there is shrinkage through a dependent prior put on functional differences, and shrinkage through the setting of most of the wavelet coefficients to zero through ...
Berger J, Jefferys W, Müller P.
europepmc +2 more sources
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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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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The strange evolution of the Large Magellanic Cloud Cepheid OGLE-LMC-CEP1812 [PDF]
, 2015 Classical Cepheids are key probes of both stellar astrophysics and cosmology as standard candles and pulsating variable stars. It is important to understand Cepheids in unprecedented detail in preparation for upcoming GAIA, JWST and extremely-large ...
Ignace, Richard +3 more
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First detection of CO emission from Cepheid Variable stars
, 2023 We present IRAM 30~m Telescope observations of the CO(1-0) and CO(2-1) emission lines in a sample of eight Cepheid variable stars. The CO(1-0) line is detected in four of the eight targets at a signal-to-noise of $>$3.5 confirming the presence of CO in Cepheid atmospheres.
Hamer, S. L., Ardern, S., Scowcroft, V.
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Equidistant frequency triplets in pulsating stars: The Combination Mode Hypothesis [PDF]
, 2006 Multiplet structures are a common feature in pulsating stars, and can be the consequence of rotational splitting, mode interaction or sinusoidal amplitude variations.
Breger, M., Kolenberg, K.
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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 +3 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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The MACHO Project LMC Variable Star Inventory: Classical Cepheids, AGB Variables, and the Nine Million Star Color-Magnitude Diagram [PDF]
Symposium - International Astronomical Union, 1999 We measure the ratio of ~ 5M⊙ blue and red LMC supergiants (representative of classical Cepheids) using the MACHO Project's 9 million star color-magnitude diagram (9M CMD) of the LMC bar. We find b/r = 0.39, which favors the Z=0.008, 5M⊙ theoretical model of Schaerer et al. (1993) over that of Fagatto et al. (1994).
Alves, DR, Basu, A, Cook, KH, Welch, DL
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