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

R. Smith; M. C. Wyatt; C. A. Haniff

doi:10.1051/0004-6361/200911626

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Volume 503 / No 1 (August III 2009)

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

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Table 2:

Observations summary.
Date and	Baseline	Pos. Angle	Seeing	Source	Target
Config.	m	$^\circ$ EoN	$^{\prime\prime}$	HD	type
05/03/2007	98.9	40.5	0.60	61 935	Cal^a
UT1-UT3	96.4	40.9	0.55	69 830	Sci
D1	102.1	38.4	0.95	95 272	Cal
	101.8	39.5	1.30	$\eta$ Corvi	Sci
	102.4	38.0	1.50	116 870	Cal
07/03/2007	59.5	113.4	1.15	61 935	Cal
UT3-UT4	60.4	113.7	1.30	69 830	Sci
A	59.8	114.3	1.25	73 840	Cal^b
	58.0	105.4	0.75	116 870	Cal
	62.4	109.0	0.80	$\eta$ Corvi	Sci
	62.1	112.5	0.65	107 218	Cal
08/03/2007	130.2	63.1	0.90	61 935	Cal
UT1-UT4	130.2	62.8	0.75	69 830	Sci
C	130.1	63.3	0.75	73 840	Cal
UT1-UT3	100.2	31.5	1.15	116 870	Cal
D2	102.3	38.3	1.60	$\eta$ Corvi	Sci
	102.2	36.5	0.70	116 870	Cal
09/03/2007	42.7	32.5	1.50	61 935	Cal
UT2-UT3	44.4	43.8	1.55	69 830	Sci
B	44.2	34.3	1.20	73 840	Cal
	42.2	26.8	0.65	116 870	Cal
	46.1	39.2	0.75	$\eta$ Corvi	Sci
	46.6	42.4	1.15	107 218	Cal

Baselines and position angle (projected on the sky) are given as the mean for the observation. ^a The first standard star observation on run D1 (of HD61935) showed great variation in visibility with wavelength (see Sect. 2.4), and so this was rejected as a suitable observation for calibration; ^b during run A the observation of standard star HD73840 could not be used, as the telescope beams showed poor alignment on the readout array. Thus the observation of HD69830 was calibrated with HD61935 only, since the next usable observation of a standard (HD116870) was taken much later in the night after sky conditions had changedsignificantly.

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