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A star under multiple influences. Magnetic activity in V815 Her, a compact 2+2 hierarchical system
Strassmeier, K. G.; Weber, M.; Granzer, T. +7 more
Context. Close binaries with magnetically active components are astrophysical laboratories for studying the effects of binarity on activity. Of particular interest are binary and multiple star systems that contain a solar-type active component with an internal structure similar to the Sun, allowing us to study how the dynamo of a solar-type star w…
Gone with the Molecular Wind: Photoevaporation in the Compact Dust Disk around CX Tau
Cleeves, L. Ilsedore; Williams, Jonathan P.; Pontoppidan, Klaus M. +5 more
We present Keck NIRSPEC+AO high-resolution (R ∼ 25,000), mid-infrared (M-band: 4.6–5.2 µm) spectra of the protoplanetary disk CX Tau. CX Tau provides an ideal laboratory to study inner disk chemistry in a disk where the signs of radial drift of pebbles are present in the form of a compact mm dust disk and extended gas disk. Our data covers m…
A study of two young multipolar planetary nebulae: Hen 2-73 and Hen 2-96
Wen, Shibo; Wang, Yong-Zhi; Hsia, Chih-Hao +4 more
We perform an infrared (IR) spectral and visible morphological study of two young planetary nebulae (YPNe) Hen 2-73 and Hen 2-96 using archival Spitzer Space Telescope and Hubble Space Telescope (HST) observations to understand their dust properties and nebular structures. High-resolution HST images of these nebulae show several bipolar lobes and …
UOCS XIV: Study of the Open Cluster NGC 2627 Using UVIT/AstroSat
Panthi, Anju; Vaidya, Kaushar; Saketh, Pinapati
We study the intermediate-age open cluster NGC 2627, located at a distance of ∼2 kpc, using UVIT/AstroSat and other archival data. Using a machine learning-based algorithm, ML-MOC, on the Gaia DR3 data, we identify 422 cluster members, including four blue straggler stars (BSSs), one yellow straggler star (YSS), one blue lurker (BL), one red clump …
The miniJPAS survey. Optical detection of galaxy clusters with PZWav
Finoguenov, A.; Hernán-Caballero, A.; Mendes de Oliveira, C. +21 more
Context. Galaxy clusters are an essential tool to understand and constrain the cosmological parameters of our universe. Thanks to its multi-band design, J-PAS offers a unique group and cluster detection window using precise photometric redshifts and sufficient depths.
Aims: We produced galaxy cluster catalogues from miniJPAS, which is a pathf…
MHz to TeV expectations from scotogenic WIMP dark matter
Siegert, Thomas; Eisenberger, Laura; Mannheim, Karl +1 more
The indirect search for dark matter is typically restricted to individual photon bands and instruments. In the context of multiwavelength observations, finding a weak signal in large foreground and background at only one wavelength band is hampered by systematic uncertainties dominating the signal strength. Dark matter particle annihilation is pro…
The giant outburst of EXO 2030+375. II. Broadband spectroscopy and evolution
Wolff, M. T.; Wilms, J.; Pottschmidt, K. +13 more
In 2021, the high-mass X-ray binary EXO 2030+375 underwent a giant X-ray outburst, the first since 2006, that reached a peak flux of ∼600 mCrab (3-50 keV). The goal of this work is to study the spectral evolution over the course of the outburst, search for possible cyclotron resonance scattering features (CRSFs), and to associate spectral componen…
Impact of α enhancement on the asteroseismic age determination of field stars. Application to the APO-K2 catalogue
Valle, G.; Dell'Omodarme, M.; Prada Moroni, P. G. +1 more
Aims: We investigated the theoretical biases affecting the asteroseismic grid-based estimates of stellar mass, radius, and age in the presence of a mismatch between the heavy element mixture of observed stars and stellar models.
Methods: We performed a controlled simulation adopting a stellar effective temperature, [Fe/H], an average lar…
The Gaia-ESO Survey DR5.1 and Gaia DR3 GSP-Spec: a comparative analysis
Recio-Blanco, A.; de Laverny, P.; Vallenari, A. +10 more
Context. The third data release of Gaia, has provided stellar parameters, metallicity [M/H], [α/Fe], individual abundances, broadening parameter from its Radial Velocity Spectrograph (RVS) spectra for about 5.6 million objects thanks to the GSP-Spec module, implemented in the Gaia pipeline. The catalogue also publishes the radial velocity of 33 mi…
Optical Variability of Gaia CRF3 Sources with Robust Statistics and the 5000 Most Variable Quasars
Makarov, Valeri V.
Using the light-curve time-series data for more than 11.7 million variable sources published in the Gaia Data Release 3, the average magnitudes, colors, and variability parameters have been computed for 0.836 million Gaia CRF objects, which are mostly quasars and active galactic nuclei (AGNs). To mitigate the effects of occasional flukes in the da…