RR Lyrae variable stars in M92, Fil

RR Lyrae variable stars in M92

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Description

RR Lyrae star can be used as "candles" do estimate the distance to them by comparing their apparent brightness against their absolute brightness. These stars vary in brighness periodically in less than a day, and this period is related to their absolute magnitude.

This image identifies four such stars and plots their brightness variation.

No photometric filter used just the "usual" Green filter.

Thes stars are roughly around apparent magnitude of 15. Absolute magnitude should be around 0.6, so the Cluster should be some 25 000 ly away from us!

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Histogram

RR Lyrae variable stars in M92, Fil