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Lambda Boötis

The blue-white main-sequence star is the prototype of a small group of chemical peculiar stars. These on their surface show the same elemental frequency like the surrounding interstellar medium. So they are very depleted in some metals.
The reason for this could be that the star in its youth was surrounded by a thick cloud of dust. This dust absorbed the metal atoms and then got blown outside by the beginning stellar wind. Wheras the gas was more permeable and stayed in the stellar vicinity.

Constellation: Boötes
Distance: 97 light-years
Spectral class: A0p
Visual magnitude: 4.18
Luminosity: 16 * Sun
Mass: 2 * Sun
Diameter: 1.7 * Sun

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    Lambda Boötis
Photo: ESO Online Digitized Sky Survey

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