The incidence of mid-infrared excesses in G and K giants

Details The incidence of mid-infrared excesses in G and K giants The incidence of mid-infrared excesses in G and K giants

2008-04-03

arxiv.org/abs/0804.0521v1

Mon.Not.Roy.Astron.Soc.387:845-855,2008

Astronomy and Astrophysics

Astrophysics

Accepted for publication in MNRAS. 13 pages, 5 figures, 2 tables (1 landscape table)

Scientific paper

10.1111/j.1365-2966.2008.13282.x

Using photometric data from the 2MASS and GLIMPSE catalogues, I investigate the incidence of mid-infrared excesses (~10 microns) of G and K stars of luminosity class III. In order to obtain a large sample size, stars are selected using a near-IR colour-magnitude diagram. Sources which are candidates for showing mid-IR excess are carefully examined and modelled to determined whether they are likely to be G/K giants. It is found that mid-IR excesses are present at a level of (1.8 +/- 0.4) x 10^-3. While the origin of these excesses remains uncertain, it is plausible that they arise from debris discs around these stars. I note that the measured incidence is consistent with a scenario in which dust lifetimes in debris discs are determined by Poynting-Robertson drag rather than by collisions.

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