Results 81 to 90 of about 11,049 (214)

The Dependence of the Extinction Coefficient on Reddening for Galactic Cepheids

The Astrophysical Journal
Cepheids are fundamental distance indicators, playing a crucial role not only in the cosmic distance ladder but also in mapping the structure, kinematics, and extinction properties of the Milky Way.
Huajian Wang, Xiaodian Chen, Shu Wang
doaj   +1 more source

The Hubble Space Telescope Extragalactic Distance Scale Key Project. X. The Cepheid Distance to NGC 7331

, 1998
The distance to NGC 7331 has been derived from Cepheid variables observed with HST/WFPC2, as part of the Extragalactic Distance Scale Key Project. Multi-epoch exposures in F555W (V) and F814W (I), with photometry derived independently from DoPHOT and ...
Abhijit Saha, Balkowski C., Barry F. Madore, Begeman K. G., Bottinelli L., Brad K. Gibson, Garcia A. M., Garth D. Illingworth, Holland Ford, Jeremy R. Mould, John A. Graham, John Hoessel, John Huchra, Laura Ferrarese, Marcelin M., Martin W. L., Mingsheng Han, Nancy A. Silbermann, Osman A. M. I., Paul Harding, Peter B. Stetson, Randy Phelps, Rawson D. M., Robert C. Kennicutt, Jr., Robert Hill, Sasselov D. D., Sersic J. L., Shaun M. G. Hughes, Shoko Sakai, Stift M. J., van den Bergh S., Wendy L. Freedman   +31 more
core   +1 more source

High resolution spectroscopy for Cepheids distance determination [PDF]

Astronomy & Astrophysics, 2006
The ratio of pulsation to radial velocity (the projection factor) is currently limiting the accuracy of the interferometric Baade-Wesselink method. This work aims at establishing a link between the line asymmetry evolution over the Cepheids' pulsation cycles and their projection factor, with the final objective to improve the accuracy of the Baade ...
Nardetto, N., Mourard, D., Kervella, P., Mathias, Ph., Merand, A., Bersier, D.   +5 more
openaire   +3 more sources

JWST Observations Reject Unrecognized Crowding of Cepheid Photometry as an Explanation for the Hubble Tension at 8σ Confidence

The Astrophysical Journal Letters
We present high-definition observations with the James Webb Space Telescope (JWST) of >1000 Cepheids in a geometric anchor of the distance ladder, NGC 4258, and in five hosts of eight Type Ia supernovae, a far greater sample than previous studies with ...
Adam G. Riess, Gagandeep S. Anand, Wenlong Yuan, Stefano Casertano, Andrew Dolphin, Lucas M. Macri, Louise Breuval, Dan Scolnic, Marshall Perrin, Richard I. Anderson   +9 more
doaj   +1 more source

PULSATIONAL AND ORBITAL PERIODS OF SMALL-AMPLITUDE CEPHEID SU CAS

Odessa Astronomical Publications, 2007
New seven high-resolutional spectra of small-amplitude Cepheid SU Cas have been obtained to determine its atmosphere parameters (Teff=6384 K; log g=2.4; Vt=3.3 km s-1) and to measure its radial velocities.
I. A. Usenko, V. G. Klochkova, N. S. Tavolzhanskaya   +2 more
doaj   +1 more source

Shifts in Respiratory Virus Epidemiology on Reunion Island From 2017 to 2023: Impact of COVID‐19 Pandemic and Non‐Pharmaceutical Interventions

Influenza and Other Respiratory Viruses, Volume 19, Issue 3, March 2025.
ABSTRACT Background The COVID‐19 pandemic has reshaped the landscape of respiratory viral infections globally. This study examines these changes on Reunion Island, a French department in the southeastern Indian Ocean. Methods Retrospective data from 2017 to 2023, from over 24,000 samples collected across the hospital system, partner laboratories, and a
Nicolas M'nemosyme, Etienne Frumence, Laurent Souply, Diana Heaugwane, Nicolas Traversier, Alizé Mercier, Jamel Daoudi, Jean‐Sébastien Casalegno, Martine Valette, Marie‐Pierre Moiton, Rodolphe Manaquin, Etienne Darieux, Raphaëlle Sarton, Anaïs Grimal, Fabian Thouillot, Xavier Deparis, Bruno Lina, Marie‐Christine Jaffar‐Bandjee   +17 more
wiley   +1 more source

The Cepheid Distance Scale: A Novel Method for Obtaining Mean Magnitudes from Single-epoch Observations

The Astronomical Journal
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) relations ...
Barry F. Madore, Wendy L. Freedman, Kayla Owens   +2 more
doaj   +1 more source

Multiplicity of Galactic Cepheids from long-baseline interferometry. II. The Companion of AX Circini revealed with VLTI/PIONIER

, 2013
Aims: We aim at detecting and characterizing the main-sequence companion of the Cepheid AX Cir ($P_\mathrm{orb} \sim $ 18 yrs). The long-term objective is to estimate the mass of both components and the distance to the system.
Bouquin, J. -B. Le, Breitfelder, J., Gallenne, A., Gieren, W., Kervella, P., Monnier, J. D., Mérand, A., Pietrzyński, G., Pilecki, B.   +8 more
core   +3 more sources

Underserved Patient Populations With Metastatic Breast Cancer: A Review of Progress and Remaining Challenges

The Breast Journal, Volume 2025, Issue 1, 2025.
Breast cancer presents a significant risk to public health and is the primary cause of cancer‐related death in women. Awareness of metastatic breast cancer (mBC) continues to increase, and advances have been made; however, challenges remain for many patient populations that do not receive equal opportunities along the treatment pathway. The Underserved
Fatima Cardoso, Rachel Wuerstlein, Tomoyuki Aruga, Renate Haidinger, Matteo Lambertini, Christine Benjamin, Elisenda Llabrés Valentí, Carmen Criscitiello, Matti Aapro, Generosa Grana, Sharon S. Gentry, Eduard Vrdoljak, Deependra Ban   +12 more
wiley   +1 more source

A Novel q-PED Method: Precise Physical Properties of a Merger-origin Binary Cepheid OGLE-LMC-CEP-1347

The Astrophysical Journal Letters
Recently, a double-lined binary classical Cepheid, OGLE-LMC-CEP-1347, was discovered with the orbital period ( P _orb  = 59 days), 5 times shorter than that of any binary Cepheid known before.
Felipe Espinoza-Arancibia, Bogumił Pilecki   +1 more
doaj   +1 more source