Results 81 to 90 of about 5,135 (186)

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

Variable Stars in M31 Stellar Clusters from the Panchromatic Hubble Andromeda Treasury

The Astrophysical Journal
Variable stars in stellar clusters can offer key constraints on stellar evolution and pulsation models, utilizing estimates of host cluster properties to constrain stellar physical parameters.
Richard Smith, Avi Patel, Monika D. Soraisam, Puragra Guhathakurta, Pranav Tadepalli, Sally Zhu, Joseph Liu, Léo Girardi, L. Clifton Johnson, Sagnick Mukherjee, Knut A. G. Olsen, Benjamin F. Williams   +11 more
doaj   +1 more source

The Masses of Cepheid Variables

The Astrophysical Journal, 1972
K. Fricke, R. S. Stobie, P. A. Strittmatter   +2 more
openaire   +1 more source

First spectroscopic investigation of anomalous Cepheid variables

Astronomy & Astrophysics
Context. Anomalous Cepheids (ACEPs) are intermediate-mass metal-poor pulsators that are mostly discovered in dwarf galaxies of the Local Group. However, recent Galactic surveys, including the Gaia Data Release 3, found a few hundred ACEPs in the Milky Way. Their origin is only poorly understood. Aims.
V. Ripepi, G. Catanzaro, E. Trentin, O. Straniero, A. Mucciarelli, M. Marconi, A. Bhardwaj, G. Fiorentino, M. Monelli, J. Storm, G. De Somma, S. Leccia, R. Molinaro, I. Musella, T. Sicignano   +14 more
openaire   +3 more sources

Toward a Comprehensive Grid of Cepheid Models with MESA. I. Uncertainties of the Evolutionary Tracks of Intermediate-mass Stars

The Astrophysical Journal Supplement Series
Helium-burning stars, in particular Cepheids, are especially difficult to model, as the choice of free parameters can greatly impact the shape of the blue loops—the part of the evolutionary track at which the instability strip is crossed.
O. Ziółkowska, R. Smolec, A. Thoul, E. Farrell, R. Singh Rathour, V. Hocdé   +5 more
doaj   +1 more source

Spatial Age Distribution of Classical Cepheids in Spiral Galaxies: The Cases of M31 and M33

The Astrophysical Journal Letters
Classical Cepheids can be used as age indicators due to well-established period–age and period–age–color relations. G. De Somma et al. refined these relations by including a metallicity term and different mass–luminosity assumptions.
Giulia De Somma, Marcella Marconi, Vincenzo Ripepi, Santi Cassisi, Roberto Molinaro, Ilaria Musella, Teresa Sicignano, Erasmo Trentin   +7 more
doaj   +1 more source

On the Density Condensations of Cepheid Variables [PDF]

Monthly Notices of the Royal Astronomical Society, 1938
openaire   +2 more sources

Tracing the Galactic Disk with the Kinematics of Gaia Cepheids

The Astrophysical Journal
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 the ...
Xiaoyue Zhou, Xiaodian Chen, Licai Deng, Shu Wang   +3 more
doaj   +1 more source

The Gaia Parallax Discrepancy for the Cluster Pismis 19 and Separating δ Scutis from Cepheids

The Astrophysical Journal
Pre-Gaia distances for the open cluster Pismis 19 disagree with Gaia parallaxes. A Two Micron All Sky Survey (2MASS) JK _s red clump distance was therefore established for Pismis 19 (2.90 ± 0.15 kpc), which reaffirms that zero-point corrections for Gaia ...
Daniel Majaess, Charles J. Bonatto, David G. Turner, Roberto K. Saito, Dante Minniti, Christian Moni Bidin, Danilo González-Díaz, Javier Alonso-Garcia, Giuseppe Bono, Vittorio F. Braga, Maria G. Navarro, Giovanni Carraro, Matias Gomez   +12 more
doaj   +1 more source

228. Cepheid variables: an update

I described Gaia's early contributions to the study of Cepheids in an earlier essay at the end of 2021. Here I bring the topic up-to-date with the results from DR3. Based on its 15,000 classified Cepheids, important applications have been improved assignment to their membership of open clusters, updates of the period-luminosity relation, and various ...
openaire   +2 more sources