The star list was compiled from a larger list of stars for which accurate
near infrared narrow-band photometry had previously been obtained (Selby
et al. 1988; Hammersley et al. 1997). The stars were chosen as single
and non variable, with spectral type in the range K9 to A0 and luminosity class
III to V. However, in practice, the stars observed for this
paper are K and G giants as these are the only suitable
sources which are sufficiently bright to give a high signal to noise
ratio at 10
m. Their V magnitudes are typically between 3 and 5.5
and their K magnitudes between -3 and 2. A list of
fainter stars (K between 2 and 3) was also planned but could not be
observed, with one exception, due to lack of time. All the data necessary
to apply the IRFM on these stars were then already available.
The observations were performed at the Infrared Telescope Facility (IRTF) on Mauna Kea (Hawaii) during four nights between February 25th and March 1st, 1992. The instrument used was the facility helium cooled bolometer.
The weather conditions were excellent during the four nights with a
seeing of 1 arcsec or better, and relative atmospheric humidity of 1%.
Programme stars were always observed at airmass between 1.0 and 1.3.
The stars were measured in five filters, namely the two broad-band N and
Q (10 and 20 m) and three narrow-band filters 8.7 m, 9.8m
and 12.5 m. A beam size of 5 arcsec and a chopper throw of 15
arcsec were used. The integration time was 10 seconds and 6, 12 or 24 cycles
were performed in each filter.
A set of 24 programme stars could be observed during the February 92 run. Nine
of them were measured twice, on two different nights. Six IRTF standards
were observed several times during the run: HR 1457 (
Tau), HR 2061 ( Ori), HR 2990 (
Gem), HR 4069 ( UMa), HR 4534 ( Leo)
and HR 5340 ( Boo). These were used to calibrate the atmospheric
transmission and instrumental response but not the final flux calibration
as will be discussed later. Two of these stars are programme
stars bringing the number of stars in the present sample to 26. The main
parameters of these stars are listed in Table 1 (click here). Unfortunately, the stars in this paper cover only the range of R.A.
from 6 to 18 hours. A second run was planned and allocated for
early September 1992, almost exactly six months apart from the first run,
in order to complete the sky coverage. Unfortunately,
the weather conditions were so bad then that not a single additional star could
be observed.
| name | RA(2000) | Dec | Spectral |  | mV | mK |  12 m | 25 m |
| type | (Jy) | (Jy) | ||||||
| HR 1457 | 04:35:55.2 | +16:30:33 | K5III | 3920 | 0.87 | -2.85 | 699.70 | 153.30 |
| HR 2077 | 05:59:31.6 | +54:17:05 | K0III | 4795 | 3.72 | 1.43 | 11.68 | 2.68 |
| HR 2335 | 06:27:15.5 | -00:16:34 | K5III | 4180 | 5.54 | 2.42 | 5.01 | 1.17 |
| HR 2443 | 06:37:53.3 | -18:14:15 | KIII1 | 4589 | 4.42 | 1.75 | 8.61 | 2.15 |
| HR 2459 | 06:43:04.9 | +44:31:28 | K5III | 4035 | 5.02 | 1.54 | 11.14 | 2.71 |
| HR 2533 | 06:51:59.9 | +23:36:06 | K5III | 4084 | 5.67 | 2.30 | 5.83 | 1.42 |
| HR 2970 | 07:41:14.8 | -09:33:04 | K0III | 4813 | 3.94 | 1.61 | 10.23 | 2.37 |
| HR 3145 | 08:02:15.9 | +02:20:04 | K2III | 4289 | 4.39 | 1.42 | 12.22 | 2.91 |
| HR 3304 | 08:26:27.6 | +27:53:36 | K5III | 4162 | 5.57 | 2.35 | 5.22 | 1.31 |
| HR 3738 | 09:25:24.0 | -05:07:03 | K5III | 3972 | 5.59 | 2.06 | 7.41 | 1.74 |
| HR 3834 | 09:38:27.2 | +04:38:57 | K3III | 4180 | 4.68 | 1.52 | 10.88 | 2.63 |
| HR 3939 | 09:59:51.6 | +56:48:42 | K5III | 4052 | 5.49 | 2.04 | 6.91 | 1.76 |
| HR 4094 | 10:26:05.4 | -16:50:11 | K4.5III | 4054 | 3.82 | 0.34 | 31.59 | 7.56 |
| HR 4232 | 10:49:37.4 | -16:11:37 | K2III | 4349 | 3.11 | 0.25 | 35.08 | 8.25 |
| HR 4335 | 11:09:39.7 | +44:29:54 | KIII1 | 4597 | 3.00 | 0.41 | 31.02 | 7.41 |
| HR 4402 | 11:24:36.5 | -10:51:34 | K5III | 3859 | 4.82 | 0.95 | 18.29 | 4.46 |
| HR 4701 | 12:20:50.7 | +57:51:50 | K5III | 4060 | 5.53 | 2.09 | 6.57 | 1.68 |
| HR 4728 | 12:25:50.9 | +39:01:07 | G9III | 4987 | 5.02 | 2.94 | 3.11 | 0.81 |
| HR 4954 | 13:07:10.6 | +27:37:29 | K5III | 4022 | 4.81 | 1.32 | 14.25 | 3.45 |
| HR 5315 | 14:12:53.7 | -10:16:25 | K3III | 4232 | 4.18 | 1.00 | 17.90 | 4.25 |
| HR 5340 | 14:15:39.6 | +19:10:57 | K1III | 4321 | -0.05 | -3.05 | 793.10 | 163.05 |
| HR 5616 | 15:04:26.7 | +26:56:51 | K2III | 4356 | 4.54 | 1.64 | 10.68 | 2.53 |
| HR 5622 | 15:06:37.5 | -16:15:24 | K5III | 3896 | 5.18 | 1.45 | 12.05 | 2.90 |
| HR 6108 | 16:22:29.1 | +33:42:13 | K5III | 3948 | 5.40 | 1.71 | 9.51 | 2.32 |
| HR 6159 | 16:32:36.2 | +11:29:17 | K7III | 3952 | 4.84 | 1.22 | 15.02 | 3.71 |
| HR 6705 | 17:56:36.3 | +51:29:20 | K5III | 3986 | 2.23 | -1.31 | 155.10 | 37.84 |