Spectroscopic Sleuthing: Unmasking Chemically Peculiar δ Scuti Stars
Kahraman Alıçavuş and colleagues analyzed ten δ Scuti stars previously labeled as chemically peculiar using high-resolution spectra and TESS data. Only three, AU Scl and FG Eri (Am stars) and HZ Vel (λ Bootis), were confirmed as peculiar, with the rest chemically normal. Their results highlight the need for detailed spectroscopic analysis and show that chemically peculiar A stars can still pulsate like δ Scuti stars, offering valuable tests for stellar evolution theories.
Seeing the Invisible: Why We Need High-Resolution Ultraviolet Spectroscopy to Understand the Universe
This paper argues that high-resolution ultraviolet spectroscopy is essential for studying cold, slow-moving gas in space. It enables detailed analysis of the interstellar medium, exoplanet atmospheres, circumstellar disks, and galactic halos. Current instruments like HST’s STIS are limited, and future telescopes must offer greater sensitivity and resolution to unlock key astrophysical insights.