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Stellar Physics Lab
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The lab uses multiwavelength observations to study stellar flares and the outbursts of cataclysmic variables.
AboutAbout the lab
Uncovering stellar explosions through observation.
The Stellar Physics Lab (Nogami Lab) investigates a wide range of activity phenomena in stars using multiwavelength observations, including visible light and X-rays.
In addition to explosive phenomena in binary systems such as cataclysmic variables and X-ray binaries, the lab conducts observational research on superflares on Sun-like stars.
Using the 3.8 m Seimei Telescope and the 40 cm telescope at the Okayama Observatory of Kyoto University, the lab carries out high-time-resolution observations of transient phenomena.
Key terms
- Cataclysmic variable
- A binary system in which a white dwarf and an ordinary star are close together; mass transfer between them causes repeated brightening
- X-ray binary
- A binary system of a neutron star or black hole and a star, which emits strong X-rays through accretion
- Superflare
- An explosive brightening of a star that is hundreds to tens of thousands of times larger than a solar flare
ResearchResearch themes
This lab aims to understand the activity phenomena of stars through multiwavelength observations. It follows transient astronomical phenomena, such as brightening events in cataclysmic variables and X-ray binaries and superflares on solar-type stars, with high-time-resolution observations.
*Illustrative imageObservational Studies of Cataclysmic Variables
The lab observes brightening events in cataclysmic variables, which are binary systems that contain a white dwarf. Using optical photometry and spectroscopy, it investigates the mechanisms behind sudden brightening (dwarf nova outbursts) and the superhump phenomenon.
*Illustrative imageObservations of Stellar Superflares
The lab observes superflares on solar-type stars, which are hundreds to tens of thousands of times larger than solar flares. Through continuous observations over several years, it examines how frequently flare-associated mass ejections occur.
*Illustrative imageMultiwavelength Observations of X-ray Binaries
The lab studies X-ray binaries containing black holes or neutron stars by combining data from X-ray astronomy satellites with optical observations. It explores the properties of accretion flows and jets across multiple wavelengths.
MembersFaculty
The members of the Stellar Physics Lab (Nogami Lab) consist of faculty and students.As of 2026
- Associate ProfessorDaisaku Nogami
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Okayama observatory (Kyoto University)” GeeKay / Public domain (cropped)
- Observational Studies of Cataclysmic Variables: “A cataclysmic variable with an evolved donor star” M.Weiss/Center for Astrophysics | Harvard & Smithsonian / CC0 (cropped)
- Observations of Stellar Superflares: “February 16, 2024 X2 5 Solar Flare (SVS14531 - SDO )” NASA's Scientific Visualization Studio - A. J. Christensen, Scott Wiessinger / Public domain (cropped)
- Multiwavelength Observations of X-ray Binaries: “Neutron Star X-ray beaming with accretion disk” NASA / Public domain (cropped)
- Related lab (Solar and Space Plasma Physics Lab): “Magnificent CME Erupts on the Sun - August 31” NASA Goddard Space Flight Center / CC BY 2.0 (cropped)
- Related lab (Theoretical Astrophysics Lab): “MergingBinaryBlackHoles” NASA/Ames Research Center/Christopher E. Henze / Public domain (cropped)
- Related lab (Solar Physics Lab): “Hidatenmondai-DSCF0255c” 0-0t / CC BY-SA 3.0 (cropped)
- Related lab (Stellar Physics Lab): “Black hole's accretion disk” NASA’s Goddard Space Flight Center/Jeremy Schnittman / CC BY-SA 4.0 (cropped)
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