Kernekoncepter
The updated catalogue of δ Scuti pulsators in binary systems contains over 1000 such objects, providing detailed statistical properties, correlations, and evolutionary diagrams of these stars.
Resumé
This work presents the largest catalogue of δ Scuti (DS) pulsators in binary systems, containing 1,048 DS in 1,043 systems as of 2024. The sample is divided based on the Roche geometry of the binary systems to investigate any systematic differences in the pulsators' evolution due to the proximity of the companion star.
The key highlights and insights from the analysis include:
Demographics and statistics: The catalogue contains detailed information on the variability types, Roche geometries, and physical properties (mass, radius, temperature, pulsation frequency) of the DS pulsators. Only about 10% of the sample have accurately determined absolute parameters.
Correlations: The well-established correlation between the orbital (Porb) and pulsation (Ppul) periods is updated, with a limit of 12.5-13 days in Porb beyond which they are uncorrelated. The correlation between the evolutionary status (log g) and Ppul also shows differences between DS in short-period detached/semidetached systems and those in long-period detached systems.
Evolutionary diagrams: The majority of binary DS are Main-Sequence stars located within the classical instability strip, in contrast with single DS stars. Only a few cases are found below the Zero-Age or beyond the Terminal-Age Main-Sequence.
Future prospects: With the upcoming data releases from Gaia, TESS, and PLATO, the sample of binary DS with well-known physical properties is expected to increase significantly, allowing for more detailed studies on the influence of binarity on the pulsational behavior of these stars.
Statistik
The DS in binary systems have masses between 1.25-2.9 M⊙ and radii between 1.3-4.4 R⊙.
The dominant pulsation frequencies of DS in detached systems range between 5-10 d^-1, while those in semidetached binaries have a peak between 15-20 d^-1.
Citater
"The vast majority of binary DS are Main-Sequence stars in contrast with the single DS."
"There is correlation between evolutionary stage and the dominant frequency of the binary DS that is similar between the members of short-period detached and semidetached binaries but totally different from that of single DS."