What is it about?
Symbiotic binaries are fascinating stellar systems where a red giant star feeds material to a small but powerful white dwarf companion. This ongoing interaction creates a complex dance of light. By studying over a decade of observations of AX Per, CI Cyg, and Z And, we discovered that these systems don't just change in one way; they exhibit several distinct 'rhythms' occurring simultaneously. While some of these pulses are caused by material flowing between the companions, others appear to be driven by intense energy releases and temperature changes on the white dwarf's surface. Our study shows how these different signals are neatly separated, giving us a clearer picture of the diverse physical forces at play in these interactions.
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Why is it important?
By combining 14 years of multi-band observations with high-cadence TESS data, this study provides a unified view of variability in symbiotic binaries across a wide range of timescales. The use of multi-color photometry allows us to track how different components contribute to the observed light, offering a more complete picture than single-band studies. This approach helps distinguish our results from previous work and provides new insight into the physical processes driving variability in these systems.
Perspectives
Future work should focus on combining long-term photometry with spectroscopic and multiwavelength observations to better separate the contributions of the red giant, the hot component, and the nebula. Expanding this type of analysis to a larger sample of symbiotic systems will help determine whether intermediate-timescale variability is a common feature or limited to specific subclasses. In addition, continued monitoring with missions like TESS will be crucial for detecting short-period signals and understanding their connection to accretion processes and white dwarf rotation.
Melis Yardımcı
Ege Universitesi
Read the Original
This page is a summary of: Photometric Modulations on Intermediate Timescales in the Symbiotic Binaries, Publications of the Astronomical Society of the Pacific, March 2026, Institute of Physics Publishing,
DOI: 10.1088/1538-3873/ae4c06.
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