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most citedChemical abundances of three new Ba stars from the Keck/HIRES spectra

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astro-ph.HE2023

Discovery of An X-ray Photoionized Optical Nebula and A Radio Nebula Associated with the ULX NGC 4861 X-1

Hang Gong, Ryan Urquhart, Alexandr Vinokurov +5

We have conducted long-slit spectroscopic observations and analyzed archival radio data for the ultraluminous X-ray source (ULX) NGC 4861 X-1. Our spectral line analysis unveils th…