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W Virginis

This is the eponym of the Population-II Cepheids or W Virginis stars. They are similar to the Delta Cepheids, but are smaller, even lighter than the Sun, and much older.

Like with the Delta-Cepheids from their period length can be reasoned well-defined to their luminosity and therefore to their distance, however with a different formula. This in the past had sometimes led to miscalculations caused by mix-ups between the two types.

Constellation: Virgo
Distance: 11 608 light-years
Spectral class: F0 - G0
Visual magnitude: 9.7 - 10.9
Luminosity: 800 - 1700 * Sun
Mass: < 1 * Sun
Diameter: 28 - 39 * Sun
Pulsation period: 17.2736 days

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    W Virginis
Photo: ESO Online Digitized Sky Survey

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