21 Vul a new luminous long period delta Scuti star

Photometric observations of 21 Vul have revealed it to be a Delta Scuti variable star with one of the longest known periods, 0.227 d, among those variables. 21 Vul presented a short period amplitude variability of about 0.05 mag, and the log of its effective temperature was calculated to be 3.891. Moreover, its luminosity (absolute visual magnitude is higher than Mv = 0) suggests a luminosity class brighter than IV, and places it in the instability strip very close to the faintest Cepheids.

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Keywords

Variable stars, Delta Scuti

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