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astro-ph.SR2025
Spectral analysis of HD 49798, a bright, hydrogen-deficient sdO-type donor star in an accreting X-ray binary
Thomas Rauch, Paul Strauß
Context: HD 49798 is a bright (), hot (effective temperature K) subdwarf star of the spectral type O (sdO). It is the only confirmed sdO-ty…
astro-ph.SR2024
Novel Constraints on Companions to the Helix Nebula Central Star
Leyla Iskandarli, Jay Farihi, Joshua D. Lothringer +3
The Helix is a visually striking and the nearest planetary nebula, yet any companions responsible for its asymmetric morphology have yet to be identified. In 2020, low-amplitude ph…