Yes, there are some stars that appear purple in the night sky. Although stars vary in color based on their temperature, purple is not a common color for stars. It is typically associated with the hottest stars, which emit most of their energy in the ultraviolet range.

Here are some examples of purple stars:

- VV Cephei: Located in the constellation Cepheus, VV Cephei is a red hypergiant star that is also known as the Garnet Star. It has a temperature of around 3,500 Kelvin and shines with a reddish-purple color.

- Gamma Cassiopeiae: Also known as Navi, this star is located in the constellation Cassiopeia. It is a binary star system consisting of a hot, blue supergiant star and a smaller, cooler star. The combination of the two stars' light gives it a purple appearance.

- Eta Carinae: Found in the constellation Carina, Eta Carinae is one of the most massive and luminous stars known in the Milky Way. It undergoes significant variations in brightness and has been observed to display different colors, including purple, during its eruptions.

- RX J2117.1 + 3412: This star, located in the constellation Vulpecula, is classified as a carbon star and is known for its deep red-purple color. It is a cool, late-stage star that releases high amounts of carbon into its surrounding environment.

- IK Pegasi: Located in the constellation Pegasus, IK Pegasi is a red dwarf star that is known for its high level of magnetic activity. It emits powerful flares and has been observed to display purple or magenta colors during these flares.

It's important to note that the appearance of these stars' colors can vary depending on factors such as atmospheric conditions and the sensitivity of the observer's eyes or the equipment used for observation.