Results 81 to 90 of about 285 (181)

The Orbit and Mass of the Cepheid AW Per

The Astrophysical Journal
The Cepheid AW Per is a component in a multiple system with a long-period orbit. The radial velocities of Griffin cover the 38 yr orbit well. An extensive program of interferometry with the Center for High Angular Resolution Astronomy array is reported ...
Nancy Remage Evans, Alexandre Gallenne, Pierre Kervella, Antoine Mérand, John Monnier, Richard I Anderson, H. Moritz Günther, Charles Proffitt, Elaine M. Winston, Grzegorz Pietrzynski, Wolfgang Gieren, Joanna Kuraszkiewicz, Narsireddy Anugu, Rachael M. Roettenbacher, Cyprien Lanthermann, Mayra Gutierrez, Gail Schaefer, Benjamin R. Setterholm, Noura Ibrahim, Stefan Kraus   +19 more
doaj   +1 more source

The OGLE Collection of Variable Stars. Anomalous Cepheids in the Magellanic Clouds

, 2015
18 pages, 9 figures, submitted to Acta ...
Soszynski, I., Udalski, A., Szymanski, M. K., Pietrzynski, G., Wyrzykowski, L., Ulaczyk, K., Poleski, R., Pietrukowicz, P., Kozlowski, S., Skowron, J., Skowron, D., Mroz, P., Pawlak, M.   +12 more
openaire   +2 more sources

Chicago–Carnegie Hubble Program: A Multiwavelength Search for the Effects of Metallicity on the Cepheid Distance Scale. I. Empirical Evidence

The Astrophysical Journal
Understanding the effects of metallicity on the multiwavelength properties of Cepheids is of continuing importance for their effective use as extragalactic distance indicators and an accurate measure of the Hubble constant, H _0 .
Barry F. Madore, Wendy L. Freedman
doaj   +1 more source

Ultra-low Amplitude Variables in the LMC -- Classical Cepheids, Pop. II Cepheids, RV Tau Stars and Binary Variables

, 2009
A search for variable stars with ultra-low amplitudes (ULA), in the millimag range, has been made in the combined MACHO and OGLE data bases in the broad vicinity of the Cepheid instability strip in the HR diagram. A total of 25 singly periodic and 4 multiply periodic ULA objects has been uncovered.
Buchler, J. Robert, Wood, Peter R., Soszynski, Igor   +2 more
openaire   +2 more sources

A comparison of variable and non-variable stars in the cepheid strip. [PDF]

The Astrophysical Journal, 1974
E. G. Schmidt, J. D. Rosendhal, C. P. Jewsbury   +2 more
openaire   +1 more source

OGLE-IV Period–Luminosity Relation of the LMC: An Analysis Using Mean and Median Magnitudes

The Astronomical Journal
The Period–Luminosity (PL) relation for Cepheid variable stars in the LMC is crucial for distance measurements in astronomy. This study analyzes the impact of using the median rather than the mean of the PL relation’s slope and zero-point.
Jaime Muñoz, Alejandro García-Varela, Santiago Henao-Castellanos, Beatriz Sabogal, Luis Felipe Giraldo, Jorge Martínez   +5 more
doaj   +1 more source

Converging on the Cepheid Metallicity Dependence: Implications of Nonstandard Gaia Parallax Recalibration on Distance Measures

The Astrophysical Journal
By comparing Cepheid brightnesses with geometric distance measures including Gaia EDR3 parallaxes, most recent analyses conclude metal-rich Cepheids are brighter, quantified as γ ∼ −0.2 mag dex ^−1 .
Louise Breuval, Gagandeep S. Anand, Richard I. Anderson, Rachael Beaton, Anupam Bhardwaj, Stefano Casertano, Gisella Clementini, Mauricio Cruz Reyes, Giulia De Somma, Martin A. T. Groenewegen, Caroline D. Huang, Pierre Kervella, Saniya Khan, Lucas M. Macri, Marcella Marconi, Javier H. Minniti, Adam G. Riess, Vincenzo Ripepi, Martino Romaniello, Daniel Scolnic, Erasmo Trentin, Piotr Wielgórski, Wenlong Yuan   +22 more
doaj   +1 more source

The Role of Next-Generation Sequencing (NGS) in the Management of Tuberculosis: Practical Review for Implementation in Routine. [PDF]

Pathogens, 2023
Beviere M, Reissier S, Penven M, Dejoies L, Guerin F, Cattoir V, Piau C.   +6 more
europepmc   +1 more source

Toward a Comprehensive Grid of Cepheid Models with MESA. III. Evolutionary and Pulsation Relations for Models with Core and Envelope Overshooting

The Astrophysical Journal Supplement Series
Evolutionary tracks for 2–8 M _⊙ models, covering a [Fe/H] = −1.0 ( Z = 0.0014) to [Fe/H] = +0.2 ( Z = 0.02) metallicity range, are computed with Modules for Experiments in Stellar Astrophysics, MESA , to investigate evolutionary and pulsation properties
Radoslaw Smolec, Oliwia Ziółkowska, Rajeev Singh Rathour, Vincent Hocdé, Piotr Wielgórski   +4 more
doaj   +1 more source

Is Crater II Disrupting?

The Astronomical Journal
Crater II (CraII) is a very intriguing low surface brightness and extended galaxy in the vicinity of our Galaxy. Motivated by its huge area and the number of RR Lyrae stars (RRLSs) detected near to its core, we performed a follow-up campaign to get deep ...
A. Katherina Vivas, Alistair R. Walker, Clara E. Martínez-Vázquez, MJ Cooke, Carme Gallart, Matteo Monelli, Jaime A. Rojas Cancino, David L. Nidever   +7 more
doaj   +1 more source