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AGN-driven outflows in the OH absorber galaxy IRAS 19154+2704
Robinson, Andrew; Storchi-Bergmann, Thaisa; Riffel, Rogemar A. +4 more
We present a two-dimensional study of the gas distribution, excitation, and kinematics of the OH absorber galaxy IRAS 19154+2704 using Gemini Multi-Object Spectrograph integral field unit observations. Its continuum image shows a disturbed morphology indicative of a past or ongoing interaction. The ionized gas emission presents two kinematic compo…
Effect of area divergence and frequency on damping of slow magnetoacoustic waves propagating along umbral fan loops
Gupta, Girjesh R.; Rawat, Ananya
Waves play an important role in the heating of solar atmosphere; however, observations of wave propagation and damping from the solar photosphere to corona through chromosphere and transition region are very rare. Recent observations have shown propagation of 3-min slow magnetoacoustic waves (SMAWs) along fan loops from the solar photosphere to co…
Classification and characterization using HCT/HFOSC spectra of carbon stars selected from the HES survey
Goswami, Aruna; Purandardas, Meenakshi
We present results from the analysis of 88 carbon stars selected from Hamburg/ESO (HES) survey using low-resolution spectra (R ∼1330 & 2190). The spectra were obtained with the Himalayan Faint Object Spectrograph Camera (HFOSC) attached to the 2-m Himalayan Chandra Telescope (HCT). Using well-defined spectral criteria based on the strength of …
The GAPS Programme at TNG: LIX. Characterisation study of the ∼300 Myr-old multi-planetary system orbiting the star BD+40 2790 (TOI-2076)
Baratella, M.; Béjar, V. J. S.; Zapatero Osorio, M. R. +35 more
Context. The long-term Global Architecture of Planetary Systems (GAPS) programme has been characterising a sample of young systems with transiting planets via spectroscopic and photometric follow-up observations. One of the main goals of GAPS is measuring planets' dynamical masses and bulk densities to help build a picture of how planets evolve in…
Comprehensive X-ray and multiwavelength study of ULXs in NGC 1566
Allak, Sinan
This paper presents a comprehensive X-ray and multiwavelength study of ultraluminous X-ray sources (ULXs) in NGC 1566 using archival Chandra, Swift/XRT, JWST, and HST observations. The main results are, first, from the hardness ratio diagram, where spectral state transitions from hard to soft as seen in typical Galactic high-mass X-ray binaries fo…
Expansion kinematics of young clusters: I. Lambda Ori
Tan, Jonathan C.; Armstrong, Joseph J.
Context. Most stars form in clusters or associations, but only a small number of these groups are expected to remain bound for longer than a few megayears. Once star formation has ended and the molecular gas around young stellar objects has been expelled via feedback processes, most initially bound young clusters lose the majority of their binding…
Soft X-ray emission from the classical nova AT 2018bej
Werner, K.; Santangelo, A.; Ducci, L. +4 more
Context. Classical novae are known to demonstrate a supersoft X-ray source (SSS) state following outbursts. This state is associated with residual thermonuclear burning on the white dwarf (WD) surface. During its all-sky survey (eRASS1), the eROSITA telescope on board the Spectrum-Roentgen-Gamma observatory discovered a bright new SSS, whose posit…
Gaps in the Main-Sequence of Star Cluster Hertzsprung-Russell Diagrams
Priya, Hasan
The presence of gaps or regions of small numbers of stars in the main sequence of the Hertzsprung-Russell Diagram (HRD) of star clusters has been reported in literature. This is interesting and significant as it could be related to star formation and/or rapid evolution or instabilities. In this paper, using Gaia DR3 photometry and confirmed member…
The grazing-angle icy protoplanetary disk PDS 453
Pinte, C.; Ménard, F.; Duchêne, G. +13 more
Context. Observations of highly inclined protoplanetary disks provide a different point of view, in particular, they provide a more direct access to the vertical disk structure when compared to less steeply inclined more pole-on disks. Aims. PDS 453 is a rare highly inclined disk where the stellar photosphere is seen at grazing incidence on the di…
Asphericity of the Base of the Solar Convection Zone
Basu, Sarbani; Korzennik, Sylvain G.
We have used solar oscillation frequencies and frequency splittings obtained over solar cycles 23 and 24 to investigate whether the base of the solar convection zone shows any departure from spherical symmetry. We used the even-order splitting coefficients, a 2–a 8, and estimated the contributions from each one separately. Th…