Zobrazeno 1 - 10
of 45
pro vyhledávání: '"Cepheid variable stars"'
Autor:
Bogumił Pilecki
Publikováno v:
The Astrophysical Journal Letters, Vol 970, Iss 1, p L14 (2024)
Almost half of all classical Cepheids do not pulsate in fundamental mode, and nowadays, the fundamentalization of their higher-mode periods is frequently applied to increase the sample size in astrophysical investigations and allow for comparison wit
Externí odkaz:
https://doaj.org/article/8409103c13214fbeaa37414da40ddee1
Autor:
I. Soszyński, D. M. Skowron, A. Udalski, P. Pietrukowicz, M. Gromadzki, M. K. Szymański, J. Skowron, P. Mróz, R. Poleski, S. Kozłowski, P. Iwanek, M. Wrona, K. Ulaczyk, K. Rybicki, M. Mróz
Publikováno v:
The Astrophysical Journal Letters, Vol 965, Iss 2, p L17 (2024)
We 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 Vul
Externí odkaz:
https://doaj.org/article/08d61c983336468da3661339f6665c50
Autor:
Jaime Muñoz, Alejandro García-Varela, Santiago Henao-Castellanos, Beatriz Sabogal, Luis Felipe Giraldo, Jorge Martínez
Publikováno v:
The Astronomical Journal, Vol 168, Iss 4, p 162 (2024)
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. It als
Externí odkaz:
https://doaj.org/article/6c50788b62d64704b19a3a8e604eef35
Autor:
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
Publikováno v:
The Astrophysical Journal, Vol 972, Iss 2, p 145 (2024)
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 report
Externí odkaz:
https://doaj.org/article/05c127c3eae6454381619399bc24a007
Publikováno v:
The Astronomical Journal, Vol 168, Iss 1, p 34 (2024)
It is beneficial to calibrate the period–Wesenheit–metallicity relation (PWZR) of Delta Cephei stars (DCEPs), i.e., classical Cepheids, using accurate parallaxes of associated open clusters (OCs) from Gaia data release 3 (DR3). To this aim, we ob
Externí odkaz:
https://doaj.org/article/bbffca0bc4534b97adbdfaf1571b0efc
Autor:
Anupam Bhardwaj, Marina Rejkuba, Chow-Choong Ngeow, Marcella Marconi, Vincenzo Ripepi, Abhinna Sundar Samantaray, Harinder P. Singh
Publikováno v:
The Astronomical Journal, Vol 167, Iss 5, p 247 (2024)
The Draco Dwarf spheroidal (dSph) galaxy is one of the nearest and the most dark-matter-dominated satellites of the Milky Way. We obtained multiepoch near-infrared (NIR, JHK _s ) observations of the central region of Draco dSph covering a sky area of
Externí odkaz:
https://doaj.org/article/165b604f8526446495905cf142581d98
Publikováno v:
The Astrophysical Journal, Vol 965, Iss 2, p 132 (2024)
Classical Cepheids (CCs) are excellent tracers for understanding the structure of the Milky Way disk. The latest Gaia Data Release 3 provides a large number of line-of-sight velocity information for Galactic CCs, offering an opportunity for studying
Externí odkaz:
https://doaj.org/article/8f7d89eaf4e042b18c6bad030f134442
Publikováno v:
The Astronomical Journal, Vol 167, Iss 5, p 201 (2024)
We present a novel technique for mapping single-phase observations of Cepheids in any given band into their time-averaged values, using strong priors on the known interrelations of the multiwavelength widths of Cepheid period–luminosity (PL) relati
Externí odkaz:
https://doaj.org/article/8d8e0f909a404d97bff09fdfafd0b6f8
Autor:
Barry F. Madore, Wendy L. Freedman
Publikováno v:
The Astrophysical Journal, Vol 961, Iss 2, p 166 (2024)
Using an updated and significantly augmented sample of Cepheid and tip of the red giant branch (TRGB) distances to 28 nearby spiral and irregular galaxies, covering a wide range of metallicities, we have searched for evidence of a correlation of the
Externí odkaz:
https://doaj.org/article/00d3b2a58c6c4778a971cfd8417a1f93
Autor:
Anupam Bhardwaj, Adam G. Riess, Giovanni Catanzaro, Erasmo Trentin, Vincenzo Ripepi, Marina Rejkuba, Marcella Marconi, Chow-Choong Ngeow, Lucas M. Macri, Martino Romaniello, Roberto Molinaro, Harinder P. Singh, Shashi M. Kanbur
Publikováno v:
The Astrophysical Journal Letters, Vol 955, Iss 1, p L13 (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 ). These 75 Ce
Externí odkaz:
https://doaj.org/article/3da763d2bc2a440096be96fbcaa622e6