Figures 6-7.
(upper): HIP 74432,
a solar-analog star
observed with GRACES
in 1-fibre (objectonly) mode. (lower)
For comparison,
Feige 66, an O-type
spectrophotometric
standard star
observed in the same
mode. Both spectra
have resolving power
in excess of 65,000.
40
trograph, is now listed with the other facility
instruments on the web pages, where previously we listed it as a “visitor” instrument.
In reality, GRACES is neither, but it has some
of the properties of both. GRACES relies on
a sharing agreement with CFHT, so we necessarily schedule it in a limited number of
blocks per semester; we cannot fully integrate it into the queue as we do with facility instruments. In that respect, it is not dissimilar to instruments such as NIRI and NICI,
which have relatively limited usage and are
not always