BRISTOL, England, Aug. 7 -- Astrophysics, a journal that says it features developments, discoveries and theories in astronomy and astrophysics, published research articles on the following topics in its Aug. 10, 2021 edition:

* Do the Periodic Activities of Repeating Fast Radio Bursts Represent the Spins of Neutron Stars?

* Excitation of Polycyclic Aromatic Hydrocarbon Emission: Dependence on Size Distribution, Ionization, and Starlight Spectrum and Intensity