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Learn MoreObservations in radial velocity have confirmed that Procyon is indeed oscillating.
Procyon B was about 2.59+0.22
−0.18 M☉ and it came to the end of its life some 1.19±0.11 billion years ago, after a main-sequence lifetime of 680±170 million years.
The strongest pulsation mode is a radial first overtone, while the second is non-radial.
The effective temperature of the Mirzam's outer envelope is about 23,150 K.
Aludra's brightness varies from magnitude +2.38 to +2.48 over a period of 4.7 days, exhibit variations in brightness due to non-radial pulsations, which means that some parts of its surfaces are expanding while others contract.