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Modeling the TESS Light Curve of Ap Si Star MX TrA
Pakhomov, Yury; Potravnov, Ilya; Romanovskaya, Anna +1 more
The TESS light curve of the silicon Ap star MX TrA was modeled using the observational surface distribution of silicon, iron, helium, and chromium obtained previously with the Doppler Imaging technique. The theoretical light curve was calculated using a grid of synthetic fluxes from line-by-line stellar atmosphere models with individual chemical a…
CHARA Near-infrared Imaging of the Yellow Hypergiant Star ρ Cassiopeiae: Convection Cells and Circumstellar Envelope
Gies, Douglas R.; Monnier, John D.; Schaefer, Gail H. +18 more
Massive evolved stars such as red supergiants and hypergiants are potential progenitors of Type II supernovae, and they are known for ejecting substantial amounts of matter, up to half their initial mass, during their final evolutionary phases. The rate and mechanism of this mass loss play a crucial role in determining their ultimate fate and the …
Differencing and Coadding JWST Images with Matched Point-spread Function
Wang, Lifan; Hu, Lei
We present an algorithm to derive difference images for data taken with JWST with matched point-spread functions (PSFs). It is based on the saccadic fast Fourier transform method but with revisions to accommodate the rotations and spatial variations of the PSFs. It allows for spatially varying kernels in B-spline form with separately controlled ph…
The oldest stars with low neutron-capture element abundances and origins in ancient dwarf galaxies
Frebel, Anna; Andales, Hillary Diane; Santos Figueiredo, Ananda +2 more
We present a detailed chemical abundance and kinematic analysis of six extremely metal-poor (-4.2 ≤ [Fe/H] ≤-2.9) halo stars with very low neutron-capture abundances ([Sr/H] and [Ba/H]) based on high-resolution Magellan/MIKE spectra. Three of our stars have [Sr/Ba] and [Sr/H] ratios that resemble those of metal-poor stars in ultra-faint dwarf gala…
The effects of stellar feedback on molecular clumps in the Lagoon Nebula (M8)
Wyrowski, Friedrich; Menten, Karl M.; Kahle, K. Angelique +3 more
Context. The Lagoon Nebula (M8) is host to multiple regions with recent and ongoing massive star formation, due to which it appears as one of the brightest H II regions in the sky. M8-Main and M8 East, two prominent regions of massive star formation, have been studied in detail over the past few years, while large parts of the nebula and its surro…
Parallax Effect in Microlensing Events Due to Free-floating Planets
Sangtarash, Parisa; Sajadian, Sedighe
One of the most important applications of microlensing observations is the detection of free-floating planets (FFPs). The timescale of microlensing due to FFPs (t E) is short (a few days). Discerning the annual parallax effect in observations of these short-duration events due to FFPs by one observer is barely possible, though their par…
Study of solar brightness profiles in the 18-26 GHz frequency range with INAF radio telescopes. II. Evidence of coronal emission
Sasso, C.; Romoli, M.; Iacolina, M. N. +43 more
Context. One of the most important objectives of solar physics is to gain a physical understanding of the solar atmosphere, whose structure can also be described in terms of the density (N) and temperature (T) distributions of the atmospheric matter. Several multi-frequency analyses have shown that the characteristics of these distributions are st…
DESI Massive Poststarburst Galaxies at z ∼ 1.2 Have Compact Structures and Dense Cores
Miquel, Ramon; Sanchez, Eusebio; Bezanson, Rachel +34 more
Poststarburst galaxies (PSBs) are young quiescent galaxies that have recently experienced a rapid decrease in star formation, allowing us to probe the fast-quenching period of galaxy evolution. In this work, we obtained Hubble Space Telescope (HST)/WFC3 F110W imaging to measure the sizes of 171 massive (
Integrated Study of X-Ray Spectrum and Time Lags for HBL Mrk 421 within the Framework of the Multiple-zone Leptonic Model
Xiao, Guang-Cheng; Hu, Wen; Kang, Jia-Lai +3 more
We present the timing analysis of 10 archived XMM-Newton observations with an exposure of >40 ks of Markarian 421. Mrk 421 is the brightest high-frequency-peaked BL Lac object emitting in X-rays produced by electrons accelerated in the innermost regions of a relativistic jet pointing toward us. For each observation, we construct averaged X-ray …
Massive compact quiescent galaxies in the M⋆ versus σe plane: insights from stellar population properties
Clerici, K. Slodkowski; Schnorr-Müller, A.; Trevisan, M. +1 more
We investigated the stellar population properties of a sample of 1858 massive compact galaxies (MCGs) extracted from the Sloan Digital Sky Survey (SDSS). Motivated by previous results showing that older compact galaxies tend to have larger velocity dispersion at fixed stellar mass, we used the distance to the σe versus Re and…