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From the 1 of 5 linked papers with an AI index.

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5 papers

astro-ph.GA2026

The Twentieth Data Release of the Sloan Digital Sky Survey: First All-Sky BOSS Spectra, eROSITA-SDSS-V Mapper Coordinated Observations, and a Preview of the Local Volume Mapper

SDSS Collaboration, Mojgan Aghakhanloo, David Aguilar +273

The paper describes the twentieth data release (DR20) of the Sloan Digital Sky Survey, providing over 3 million new optical spectra from the SDSS‑V Milky Way, Black Hole, and Local…

astro-ph.SR2025

Atmospheric parameters and chemical abundances of young stars with APOGEE. I. Orion star-forming region

Ricardo López-Valdivia, Lucía Adame, Carlos G. Román-Zúñiga +19

We derive atmospheric parameters and chemical abundances in young G-, K-, and M-type stars (temperatures between 6500 and 3100 K) using infrared APOGEE-2 spectra. Atmospheric param…

astro-ph.SR2025

ABYSS III: Observing accretion activity in young stars through empirical veiling measurements

Serat Saad, Marina Kounkel, Keivan G. Stassun +5

Stellar accretion plays an important role in the early stages of stellar evolution, particularly in Classical T Tauri Stars (CTTSs). Accretion of a CTTS can be related to different…

astro-ph.SR2025

The past, present and future of observations of externally irradiated disks

Planet formation environments collaboration, Megan Allen, Rossella Anania +51

Recent years have seen a surge of interest in the community studying the effect of ultraviolet radiation environment, predominantly set by OB stars, on protoplanetary disc evolutio…

astro-ph.HE2025

Long-Term X-ray Variability on the Benchmark YSO HL Tau

Steven M. Silverberg, Scott J. Wolk, David A. Principe +4

HL Tau is one of the most well-studied Class I young stellar objects, including frequent observations at near- and mid-infrared, (sub-) millimeter, and X-ray wavelengths. We presen…