Photometry

RGB 3 images

502nm 656nm 673nm

H-alpha SIIOIII

Origin of the lines

• These lines are the result of atoms jumping from one state to another

• Different atoms have different spectral signatures

• Observation of a line can tell us exactly what atom is responsible.

• Dark lines are the result of atoms absorbing light, and bright lines are due to atoms emitting light.

Pillars ofCreation

創造之柱

Evaporating Gaseous Globules,EGGs 星蛋

Credit: NASA, ESA, STScI, J. Hester and P. Scowen (Arizona State University)

Credit: T.A.Rector, B.A.Wolpa, J. Hester, P. Scowen, NASA, ESA, and The Hubble Heritage Team (STScI/AURA), STScI.

M16 Eagle Nebula 鷹狀星雲

Credit: www.genesis16.net

CCD – Charged Couple Device

Credit: Molecular Expressions, Florida State University

Credit: Molecular Expressions, Florida State University

Credit: Molecular Expressions, Florida State University

Credit: Molecular Expressions, Florida State University

Credit: Molecular Expressions, Florida State University

Credit: Molecular Expressions, Florida State University

Credit: Sky & Telescope

Aperture Photometry