On the 75-day Cepheid and the envelope of the period-amplitude diagram in M31

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Andromeda Galaxy, Cepheid Variables, Amplitudes, Light Curve, Stellar Magnitude

Scientific paper

On the basis of 30 observations the period of the new cepheid in M31, P
= 75.487 is obtained. This cepheid has an extremely long period and
gives a possibility to determine the period-amplitude envelope toward
the long-period region in M31 galaxy. A comparison of the
period-amplitude diagram in various galaxies is made.

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