Principles of the use of stellar spectral classes (A-level only) (3.9.2.4) | AQA A-level Physics (7408) | KnowledgeSet

Principles of the use of stellar spectral classes (A-level only)

Physics · A-Level · AQA · AQA A-level Physics (7408) · Specification point · 3.9.2.4 · Astrophysics (A-level only) · Classification of stars (A-level only)

Stellar spectral classification

Temperature dependence of Balmer absorption

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3.9.2.4 Principles of the use of stellar spectral classes (A-level only)

Description of the main classes:

Spectral class	Intrinsic colour	Temperature / K	Prominent absorption lines
$O$	$blue$	$25 000 - 50 000$	$He⁺, He, H$
$B$	$blue$