We report 24 and/or 70 μm measurements of~ 160 A-type main-sequence stars using the
Multiband Imaging Photometer for Spitzer (MIPS). Their ages range from 5 to 850 Myr …

We report new Spitzer 24 μm photometry of 76 main-sequence A-type stars. We combine
these results with previously reported Spitzer 24 μm data and 24 and 25 μm photometry from …

Vega-like stars are young main-sequence stars exhibiting an excess emission of infrared
radiation. Modelling this excess depends not only on the parameters assigned to the grains …

We have estimated the ages of a sample of A-type Vega-like stars by using Strömgren uvby
β photometric data and theoretical evolutionary tracks. We find that 13% of these A stars …

The evolutionary status of the chemically peculiar class of λ Boo stars has been intensely
debated. It is now agreed that the λ Boo phenomenon affects A stars of all ages, from star …

The literature on the $\lambda $ Boo stars has grown to become somewhat heterogenous,
as different authors have applied different criteria across the UV, optical and infrared regions …

The λ Bootis stars are Population I, late B-to early F-type stars, with moderate to extreme (up
to a factor 100) surface underabundances of most Fe-peak elements and solar abundances …

Protoplanetary discs, debris discs, and disrupted or evaporating planets can all feed
accretion on to stars. The photospheric abundances of such stars may then reveal the …

λ Bootis stars challenge our understanding of diffusion and accretion processes related to
stars and their circumstellar environment, and they are interesting components of the …

Strong evidence for deep mixing has been uncovered for slowly rotating F and A stars of the
main sequence. As the accretion/diffusion model for the formation of λ Bootis stars is heavily …