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The radial pulsation of AI Aurigae
We present an analysis of eleven years of Strömgren by photometryof the red semiregular variable star AI Aurigae. An early perioddetermination of 63.9 days is confirmed by the long-term light curvebehaviour. The light curve shows semi-regular changes with a mean periodof 65 days reaching an amplitude of 0\fm6 in some cycles. The b-y colourchanges perfectly parallel the V light curve, suggesting radialoscillation to be the main reason for the observed variations. Weestimate the main characteristics of the star (mass, radius, effectivetemperature) that suggest radial pulsation in fundamental or firstovertone mode.
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Observation and Astrometry data
| Constellation: | Cocher |
| Right ascension: | 06h34m44.00s |
| Declination: | +29°57'44.8" |
| Apparent magnitude: | 9.542 |
| Proper motion RA: | 10.3 |
| Proper motion Dec: | -44.6 |
| B-T magnitude: | 10.916 |
| V-T magnitude: | 9.656 |
Catalogs and designations:
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