Search Publications
Chemodynamical study of two CEMP-no stars from the Hamburg/ESO Survey
Shejeelammal, J.; Goswami, Aruna
The Carbon-Enhanced Metal-Poor (CEMP) stars with no enhancement of neutron-capture elements, the so-called CEMP-no stars are believed to be the direct descendants of first-generation stars and provide a unique opportunity to probe the early Galactic nucleosynthesis. We present a detailed chemical and kinematic analysis for two extremely metal-poor…
Impacts of the Local arm on the local circular velocity inferred from the Gaia DR3 young stars in the Milky Way
Seabroke, George; Kawata, Daisuke; Hunt, Jason A. S. +3 more
A simple one-dimensional axisymmetric disc model is applied to the kinematics of O type and B type stars (OB stars) near the Sun obtained from Gaia Data Release 3 catalogue. The model determines the 'local centrifugal speed' Vc(R0) - defined as the circular velocity in the Galactocentric rest frame, where the star would move …
Evolution of X-ray galaxy cluster properties in a representative sample (EXCPReS). Optimal binning for temperature profile extraction
Arnaud, M.; Pointecouteau, E.; Pratt, G. W. +2 more
We present XMM-Newton observations of a representative X-ray selected sample of 31 galaxy clusters at moderate redshift (0.4 < z < 0.6), spanning the mass range 1014 < M500 < 1015 M⊙. This sample, EXCPReS (Evolution of X-ray galaxy Cluster Properties in a Representative Sample), is used to te…
The Hertzsprung progression of classical Cepheids in the Gaia era
Marconi, Marcella; Molinaro, Roberto; Ripepi, Vincenzo +6 more
A new fine grid of non-linear convective pulsation models for the so-called 'bump Cepheids' is presented to investigate the Hertzprung progression (HP) phenomenon shown by their light and radial pulsation velocity curves. The period corresponding to the centre of the HP is investigated as a function of various model assumptions, such as the effici…
A comprehensive search for hot subdwarf stars using Gaia and TESS. I. Pulsating hot subdwarf B stars
Uzundag, Murat; Pelisoli, Ingrid; Németh, Péter +5 more
Hot subdwarf B (sdB) stars are evolved, subluminous, helium-burning stars that most likely form when red giant stars loose their hydrogen envelope via interactions with close companions. They play an important role in our understanding of binary evolution, stellar atmospheres, and interiors. Only a small fraction of the sdB population is known to …
Cepheid Metallicity in the Leavitt Law (C-MetaLL) survey. V. New multiband (grizJHKs) Cepheid light curves and period-luminosity relations
Ripepi, V.; Molinaro, R.; Marconi, M. +8 more
Context. The highly debated effect of metallicity on the absolute magnitudes of classical Cepheid variables needs to be properly quantified for determining accurate and precise distances based on their Leavitt Law.
Aims: Our goal is to obtain homogeneous optical and near-infrared light curves of Milky Way Cepheid variables complementing their…
A Detailed Survey of the Parallel Mean Free Path of Solar Energetic Particle Protons and Electrons
Ruffolo, D.; Dresing, N.; Bandyopadhyay, R. +4 more
In this work, more than a dozen solar energetic particle (SEP) events are identified where the source region is magnetically well connected to at least one spacecraft at 1 au. The observed intensity–time profiles, for all available proton and electron energy channels, are compared to results computed using a numerical one-dimensional SEP transport…
JWST Photometry of Globular Clusters in A2744. II. Luminosity and Color Distributions
Harris, William E.; Reina-Campos, Marta
Deep JWST imaging of the giant galaxy cluster A2744, at redshift z = 0.308, is used to explore the features of its rich population of globular clusters (GCs), building on our initial survey of the system. We use the photometry of more than 10,000 GCs over a 3 mag range to construct the GC luminosity function and color distribution. These results n…
Surveys of clumps, cores, and condensations in Cygnus-X. SMA observations of SiO (5−4)
Qiu, Keping; Yang, Kai; Pan, Xing
Context. The SiO emissions are usually used to trace high-velocity outflow shocks in star-forming regions. However, several studies have found low-velocity and widespread SiO emissions not associated with outflows in molecular clouds.
Aims: We aim to detect and characterize the SiO emissions in massive dense cores (MDCs), and explore the prop…
Halfway to the Peak: The JWST MIRI 5.6 µm Number Counts and Source Population
Veilleux, Sylvain; Marchesini, Danilo; Alberts, Stacey +9 more
We present an analysis of eight JWST Mid-Infrared Instrument (MIRI) 5.6 µm images with 5σ depths of ≈0.1 µJy. We detect 2854 sources within our combined area of 18.4 arcmin2. We compute the MIRI 5.6 µm number counts, including an analysis of the field-to-field variation. Compared to earlier published MIRI 5.6 µm …