Search Publications
A search for close binary systems in the SALT survey of hydrogen-deficient stars using TESS
Dorsch, M.; Jeffery, C. S.; Snowdon, E. J. +1 more
The TESS periodograms of the SALT survey catalogue of hydrogen-deficient stars were searched for evidence of short-period variability. Periodic light-curve variations were identified in 16 stars out of 153 catalogue objects, of which 10 were false positives. From the remaining 6 identified variables, Ton S 415 is a known close binary system and th…
CDN-Net: Faint Celestial Target Detection Based on Densely Nested Hierarchical Network
Chen, Guo; Xue, Bindang; Li, Xinyang +2 more
The detection of celestial objects in ground-based wide-field optical telescope images serves as the foundational step for subsequent celestial analysis tasks. Existing methods for astronomical target detection have not addressed the challenges posed by a high dynamic range, faintness of targets, and an inaccurate supervision map. This paper prese…
A simplified approach for reproducing fully relativistic spectra in X-ray binary systems: Application to Cygnus X-1
Papavasileiou, Th. V.; Kosmas, O.; Kosmas, T. S.
Context. General relativistic effects are strong near the black hole of an X-ray binary and significantly impact the total energy released in the innermost accretion disk's region. The simple pseudo-Newtonian solution in the standard disk model cannot replenish for effects such as light-bending, gravitational redshift, and Doppler boost. These can…