SX Phoenicis variable

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What Wikipedia says

An SX Phoenicis variable is a type of variable star. These stars exhibit a short period pulsation behavior that varies on time scales of 0.03–0.08 days (0.7–1.9 hours). They have spectral classifications in the range A2-F5 and vary in magnitude by up to 0.7.

Excerpt from the Wikipedia article “SX Phoenicis variable”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: PopePompus, CC BY-SA 4.0, via Wikimedia Commons.