Resolving the hot dust around HD69830 and η Corvi with MIDI and VISIR

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Volume 503 / No 1 (August III 2009)

A&A, 503 1 (2009) 265-279

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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	2^a	08 18 23.95	-21 37 55.8	872	102	80
$\eta$ Corvi	F2V	1.3^b	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).

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