weakline
Weakline is a term used in spectroscopy and astronomy to describe a spectral line whose strength is small compared with the surrounding continuum. The strength of a line is commonly measured by its equivalent width, depth, or flux relative to the continuum. A weak line can arise in absorption or emission and may be influenced by factors such as chemical abundance, temperature, density, and instrumental sensitivity.
In stellar astrophysics, the phrase appears most often in reference to weak-line T Tauri stars (WTTS). WTTS
In the study of active galactic nuclei and quasars, weak-line quasars (WLQs) describe quasars with unusually
Outside astronomy, weak lines in laboratory and atmospheric spectroscopy can result from low elemental abundance, low