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Delta Delphini

Star in the constellation Delphinus

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This is a double-lined spectroscopic binary system with an orbital period of 40.58 days. The two components are nearly identical chemically peculiar stars, having a combined stellar classification of kA7hF1VmF1pSrEuCr:. This notation indicates the calcium K line matches an A7 star, the hydrogen lines an F1 star, and the metal lines an F1 star, with particularly strong lines of strontium, europium, and chromium. Each of the stars is a Delta Scuti variable, with the system having a dominant period of 0.1568 days and an amplitude of 0.0700 in magnitude. Delta Delphini forms the prototype of a class of metal-lined δ Scuti subgiant or giant stars.

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