3 papers
astro-ph.SR2025
Reconsidering The Bailey Diagrams of ab-type RR Lyrae Stars, Metallicity-Mediated Evolution as the Direct Cause of the Oosterhoff Phenomenon
L. -J. Li, S. -B. Qian, L. -Y. Zhu +2
We re-examine the Bailey diagrams of fundamental mode RR Lyrae stars from the perspective of horizontal branch (HB) evolution, identifying evolutionary effects as the probable dire…
astro-ph.SR2024
A brown dwarf orbiting around the planetary-nebula central binary KV Vel
S. -B. Qian, L. -Y. Zhu, F. -X. Li +9
KV Vel is a non-eclipsing short-period (P = 0.3571 days) close binary containing a very hot subdwarf primary (77000 K) and a cool low-mass secondary star (3400 K) that is located a…
astro-ph.SR2024
Photometric and Spectroscopic Analysis of V583 Lyrae, an Algol with a g-mode Pulsating Primary and Accretion Disk
Hui-Ting Zhang, Sheng-Bang Qian, Wen-Ping Liao +2
V583 Lyr is an extremely low mass ratio Algol-type binary with an orbital period of 11.2580 days. We determined an effective temperature of T_{eff1} = 9000 \pm 350 K from newly obs…