Extrinsic variable stars constitute a research area focused on stellar brightness variations arising from external geometric or environmental factors rather than intrinsic changes in stellar structure or energy generation. This field primarily investigates eclipsing binaries, rotating spotted stars, and systems with circumstellar or circumbinary material that modulate observed luminosity through occultation, reflection, or beaming effects. Research emphasizes precise photometric and spectroscopic monitoring, light-curve modeling, and orbital parameter determination to infer stellar radii, masses, inclination angles, and surface inhomogeneities, thereby constraining stellar evolution models, binary interaction physics, and population statistics of variable systems in different Galactic environments.
Astronomers from the California Institute of Technology (Caltech) and elsewhere report the discovery of a binary system consisting of two brown dwarfs undergoing stable mass transfer. The detection of the system, designated ...
Anastasios (Andy) Tzanidakis was combing through old telescope data from 2020 when he found an otherwise boring star acting very strangely. The star, named Gaia20ehk, was about 11,000 light-years from Earth near the constellation ...
Planetary Sciences
Mar 11, 2026
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759
Using NASA's Kepler space telescope, Chinese astronomers have observed a binary star system known as KIC 5623923. As a result, they found that the investigated system is a faint eclipsing binary experiencing Delta Scuti-type ...
Astronomers from the Center of Astronomical and Space Education in Moscow report the discovery of a new star, which turned out to be an eclipsing variable binary. The finding of the new star, which received designation Grigoriev ...
Using the 104-cm Sampurnanand optical telescope, Indian astronomers have performed photometric observations of an open cluster named King 6, which resulted in the detection of three new variable stars in the field of this ...
This illustration shows a hypothetical uneven ring of dust orbiting KIC 8462852, also known as Boyajian's Star or Tabby's Star. The star has experienced unusual dips in brightness over a matter of days, as well as much subtler ...
Astronomy
Nov 22, 2024
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60
One of the brightest stars in the night sky, Betelgeuse, may not be on the brink of exploding as a supernova, according to a new study of the star's brightening and dimming. Instead, recent research shows that the observed ...
Astronomy
Oct 21, 2024
0
408
