AX Dra is characterized as a 0.568-day semi-detached eclipsing binary with component masses 1.717 and 0.804 solar masses, radii 1.541 and 1.237 solar radii, and four independent gamma Dor pulsation frequencies in the primary, making it the shortest such system and suggesting the primary is an accret
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10 Pith papers cite this work. Polarity classification is still indexing.
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New NIR OH-based oxygen abundances for 35 VMP stars are empirically calibrated against the [OI] line to flatten the [O/Fe] vs [Fe/H] trend and improve agreement with Galactic chemical evolution models.
Spectral disentangling of ET Cru yields masses of 13.41 and 6.00 solar masses with 1.3% precision and shows the secondary has severe CNO-cycle chemical anomalies exceeding typical Algol systems.
Asteroseismic modeling of RY Leporis gives a mass of ~2 solar masses and age of ~730 Myr, locating it in the post-main-sequence hydrogen shell-burning stage with consistent metallicity.
Negative Ca II IRT residual indices in FGK stars arise mainly because synthetic photospheric templates miss chromospheric structure and NLTE effects that deepen the observed cores.
Model-independent masses and radii plus effective temperatures are derived for the F9 V primary (M1=1.36 Msun, R1=1.72 Rsun, Teff=6197 K) and M-dwarf secondary (M2=0.56 Msun, R2=0.53 Rsun, Teff=3770 K) in CD-27 2812.
Observational analysis of four nearly equal-mass detached eclipsing binaries shows diversity in evolutionary stage and magnetic activity, with new absolute parameters reported for each system.
High-precision analysis of TYC 6044-714-1 favors s+r nucleosynthesis over i-process models, which require implausible conditions and mismatch Ba isotopes.
In Tombaugh 2, 32% of blue straggler stars show ultraviolet excess from hot companions consistent with recent binary mass transfer, supporting this channel over mergers in a low-density cluster.
Student teams at an ESO school obtained spectroscopic and photometric data on binary stars and blue stragglers, confirming alignment due to tides, cluster membership via abundances, delta Scuti pulsation, and a binary central star in a planetary nebula.
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Asteroseismic analysis of RY Leporis: the post-main sequence HADS in a binary system
Asteroseismic modeling of RY Leporis gives a mass of ~2 solar masses and age of ~730 Myr, locating it in the post-main-sequence hydrogen shell-burning stage with consistent metallicity.
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Diversity in Evolutionary Status and Magnetic Activity among Solar-Type Twin Detached Eclipsing Binaries
Observational analysis of four nearly equal-mass detached eclipsing binaries shows diversity in evolutionary stage and magnetic activity, with new absolute parameters reported for each system.