a young massive star cluster: NGC

Open access Sep 2026

JWST Observations of Starbursts: A Young Bubble in NGC 253’s Central Starburst

We present a multiwavelength analysis of a young bubble in the nuclear starburst of NGC 253 using new JWST MIRI–MRS observations together with archival ALMA (100, 350, 690 GHz) and Chandra data. The MIRI maps reveal a prominent bubble-like structure in both ionized and molecular emission lines. The bubble is spatially...

Kaitlyn E. Sheriff, E. Mills, Xin-Yu Mai et al. · Astronomical Journal · 0 citations

Review Open access Aug 2026

Benchmark Brown Dwarf Systems. I. Chemical Abundance Analysis of FGK Stars with Wide-separation Brown Dwarf Companions Using PEPSI

We present results from a spectroscopic survey of 32 FGK stars hosting brown dwarfs, using high-resolution optical spectra (R = 130,000 and 50,000) obtained with the Potsdam Echelle Polarimetric and Spectroscopic Instrument spectrograph on the Large Binocular Telescope. The primary goal of this survey is to determine p...

C. Phillips, Megan Bedell, Catherine Manea et al. · Astrophysical Journal · 0 citations

Open access Sep 2026

The Comprehensive Investigations of the NGC 7419 Open Cluster and the New Perspective on Mass Populations

We present a structural, kinematic, and photometric analysis of the young, red supergiant- and Be star-rich open cluster NGC 7419 using Gaia DR3 and 2MASS data. This cluster is located at equatorial coordinates α= 343.58 ± 0.06◦and δ= 60.81 ± 0.03◦. By applying the HDBSCAN algorithm and adopting a conservative memb...

Nasser M. Ahmed, Remziye Canbay, D. Çınar · Research in Astronomy and As... · 0 citations

Open access Aug 2026

TESS Asteroseismology of Red Giants in the Old Supersolar-metallicity Open Clusters NGC 188 and NGC 6791

Open clusters are fundamental laboratories for investigating stellar and Galactic evolution, and serve as important benchmarks for asteroseismic analyses. Using a “boutique” method to analyze TESS photometry, we study red giants in two old supersolar-metallicity open clusters: NGC 188 and NGC 6791. By comparing Kepler...

Madeline Howell, Jennifer A. Johnson, M. Pinsonneault et al. · Astrophysical Journal · 0 citations

Review Open access Aug 2026

Spectral Synthesis for Classical Ae Stars: Hα and Ca II

Classical Ae (CAe) stars are main-sequence, A-type stars with Hα emission but no signature of dust; they are thought to be the cool extension of classical Be (CBe) stars to lower stellar masses. We investigate the use of Hα and the Ca ii IR triplet observed at low spectroscopic resolution ( R=1800 ) as diagnostics for...

R. Anusha, T. A. A. Sigut · Astrophysical Journal · 0 citations

Review Open access 2026

Determining the Hubble constant through the analysis of Abell clusters

The Hubble constant (H0) quantifies the present-day expansion rate of the Universe and is a fundamental parameter for determining its age; however, modern cosmology faces significant tension, as increasingly precise measurements continue to yield mutually inconsistent values. The two main methods of measuring H0, namel...

Audrey Lee, T. Somboonpanyakul · Journal of emerging investig... · 0 citations