Glossary term: A-type star

Also known as A Star or A-Star

Description: A star with spectral type "A". These are classified on the basis of strong absorption lines from hydrogen in their spectra. A-stars have "surface" temperatures (the temperature of the layer in the star from which its light is emitted also known as effective temperature) between around 7400 kelvins (K) and 10,000 K and usually appear white to the human eye. Sirius, the brightest star in the night sky, is an A-star.

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Term and definition status: This term and its definition is still awaiting approval

The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".