Lambda Bootis star
A Lambda Bootis star is a rare type of A star with weak metallic lines
(showing a deficiency in heavy elements) and unusually slow rotation. Lambda
Bootis stars may be pre-main-sequence objects, or they may be main
sequence stars that formed from gas whose metal atoms had been absorbed
by interstellar dust. The prototype of the class, Lambda Bootis, lies 97
light-years away in the constellation Bo÷tes.
It is of spectral class A0p and has a visual magnitude of 4.18 and a luminosity
about 16 times that of the Sun.
Photo: ESO Online Digitized Sky Survey
• variable stars