Hertzsprung gap

The Hertzsprung gap, also known as the Hertzsprung-Russell gap, refers to a region in the Hertzsprung-Russell diagram (HR diagram) that is largely empty of stars. The HR diagram plots stars according to their absolute brightness (or luminosity) and their surface temperature (or spectral class). In this diagram, most stars fall along a diagonal band known as the main sequence, where they spend the majority of their lifetimes fusing hydrogen into helium.

14 Ceti is a star located in the constellation Cetus, which is often referred to as the Whale. It is a G-type giant star, which means it has exited the main sequence phase of its life and has expanded and cooled after exhausting the hydrogen fuel in its core. The star is approximately 200 light-years away from Earth and has a brightness that is roughly 100 times that of our Sun.

31 Comae Berenices, also designated as 31 Com, is a binary star system located in the constellation Coma Berenices. It is not particularly bright, with an apparent magnitude of about 5.8, making it visible to the naked eye under good conditions. The system is approximately 80 light-years away from Earth.

AE Ursae Majoris is a binary star system located in the constellation Ursa Major. It consists of two stars that are close together in terms of their distance from Earth, making the system an interesting target for astronomical observation. The primary star is a focal point for researchers due to its classification as a variable star, specifically a type of AP star, which exhibits variations in luminosity.

HD 185269 is a star located in the constellation of Hercules. It is classified as a G-type main-sequence star (similar to the Sun) and is also known for being a candidate host for exoplanets. The star has been the subject of study in searches for planets, and various observations have been conducted to understand its composition and potential surrounding planetary system.

OU Andromedae is a binary star system located in the constellation of Andromeda. It is classified as a close binary system composed of two stars that are in orbit around each other. This system is particularly interesting because it includes a red giant star and a companion, which is typically a smaller and less luminous star. The properties of OU Andromedae have been studied extensively to understand its characteristics better, including its orbital parameters, brightness variations, and spectral types.