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Gregor@Night ist das Konzept eines Doppelfaser-Echelle-
ble Echelle spectrograph for the night-time use of
Spektrographen für den Nachtbetrieb von GREGOR, das
GREGOR, the world’s largest solar telescope. The
weltgrößte Sonnenteleskop. Die beiden Weißpupillen-Spek-
white pupil spectrographs are designed for spectral
trographen sind für Wellenlängenbereiche von 360 bis 490
ranges of 360-490 nm and 510-870 nm, respectively,
Gregor@Night is the concept for a fiber-fed dou-
nm und 510 bis 870 nm ausgelegt, und erreichen eine spek-
and achieve a spectral resolution of 100,000 for an en-
trale Auflösung von 100.000
trance aperture of 3” on the
bei einer Eingangsaper-
sky, using a 120um opti-
tur von 3“ am Himmel.
cal fiber with a 3-slice
Dies wird mit durch
die Verwendung ei-
optical slicer. Acquisition
ner 120um Licht-
and guiding is based on
leitfaser und von
the STELLA unit, a grey
beam splitter diverts ap-
proximately 3% of the light to
licht. Die Einheit
a high-speed CCD camera, a glass
plate with an aperture stop defines the
und Nachführung
entrance aperture of the fiber. Light injection
takes place at the GREGOR F2 focus at f/6.
basiert auf der STEL-
The science case for this instrument is the search
LA AG-Einheit: ein grauer Strahlteiler wirft 3%
des Lichtes auf eine
Fig. 8: Model of the PEPSI spectrograph
with all components in its inner enclosure.
for solar twins, which are evidently much rarer than
simple extrapolation from counts in the solar neigh-
borhood would suggest. Are stars with solar para-
CCD Kamera, eine verspiegelte Glasplatte definiert die
meters really as rare as it seems, or have they not been
Faser-Eintrittsapertur. Das Licht wird im GREGOR F2 Fo-
looked for hard enough. And if they really are so few,
kus bei f/6 in die Lichtleitfaser eingekoppelt.
what can we learn from that?
Fig. 9: STELLA Echelle Spectrograph on Tenerife. The inclined unit in the center is the Echelle grating, the optical fiber curves around the grating and enters the
spectrograph behind the grating. Light baffles are visible at the left, the blue unit in the rear is the CCD camera with the hoses of the cooling system.