2006PASJ...58.1023S

The elemental abundances of 16 elements in the Vega-like and g Doradus-type variable star HD 218396 have been determined. A model atmosphere with T_eff = 7250K, log g = 4.30, and a metallicity of [M/H] = -0.50 was used. A moderate, but definite, deficiency in the abundance of iron, [Fe/H] = -0.55±0.1, has been confirmed. Other elements, Na through Ba, are also as under-abundant as Fe. On the other hand, two light elements, C and O, show solar abundances. These findings confirm the l Bootis nature of this star, which had been so classified based on a low-resolution optical spectrum. The observed abundance pattern provides a constraint in understanding the nature of this interesting object, which shows excess emission in the infrared region, implying that the star is accompanied by a dusty-debris disk, and at the same time shows photometric and spectroscopic variations arising from non-radial high-order g-mode pulsations.