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Table 1:

Characteristics of the science and calibration targets.
Science targets
Source Spec type Age RA Dec $F_\ast$ at 1 $\mu $m $F_{\rm {disc}}$ at 10 $\mu $m Predicted disc size
HD   Gyr     mJy mJy mas
69 830 K0V 2a 08 18 23.95 -21 37 55.8 872 102 80
$\eta $ Corvi F2V 1.3b 12 32 04.23 -16 11 45.6 1736 371 90
Calibrators
Source Spectral type RA Dec $F_\ast$ at 10 $\mu $m Angular size
HD       mJy mas
61935 G9III 07 41 14.83 -09 33 04.10 9490 $2.24 \pm 0.01$
73840 K3III 08 40 01.47 -12 28 31.30 12312 $2.40 \pm 0.01$
95272 K1III 10 59 46.46 -18 17 55.56 9510 $2.24 \pm 0.01$
116870 K5III 13 26 43.17 -12 42 27.60 10416 $2.58 \pm 0.01$
107218 M4III 12 19 42.59 -19 11 55.97 7913 $2.16 \pm 0.02$
For science targets the stellar flux was determined by Kurucz model profiles scaled to the 2MASS K band photometry. Total fluxes taken from IRS photometry of the targets were then used to determine the disc flux, with the predicted size being based on SED fitting with a blackbody. For calibration targets the angular size is as given by the CalVin tool available at http://www.eso.org/instruments/midi/tools.
Key: a age from Beichman et al. (2006); b age from Mallik et al. (2003): note that the X-ray luminosity of this star is close to the mean value for the Hyades cluster which may suggest a younger age of 600-800 Myr (Stern et al. 1995).

Source LaTeX | All tables | In the text

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