Three Bright Semi-Regular Variables for Summer.

If you are looking to add some new variables to your observing list, then here are some stars you may want to consider.

Delphinus contains two easy to find variables: EU Del and U Del. Both EU Del and U Del are pulsating red giants and both are classified as semi-regulars (SRB). EU Del has an amplitude of 5.4 – 6.7 and a period of about 59 days. U Del has an amplitude of 6.1 – 7.6 and a period of about 120 days.

In the nearby constellation of Serpens, the bright variable Tau 4 Ser can be found not far from R Serpentis. Tau 4 Ser is another semi-regular variable (SRB) with an amplitude of 5.9 – 7.1, and a period of 87 days.

Below are finder charts for these stars, which have been adapted from the BAA Charts.