HEROS is two-channels echellet spectrograph loan from the Landessternwarte Heidelberg-Koenigstuhl, Germany. It was installed in Ondrejov in July 2000. After some tests, the first stellar spectrum (gamma Lyrae) was exposed on Monday, July 31th, 2000.
The easy scheme of the HEROS is on the following picture:
| The scheme of the HEROS. The light beam incoming through the fiber (from the right) to the collimator. The parallel beam incides to the echelle grating. Then the spectrum is divided via semitransparent dichroic filter to the two channels: ``red'' and ``blue'' The effective range of the blue channel is 3700 ÷ 5750 angströms, and of the red channel 5800 ÷ 8350 angströms. |
| The picture of the HEROS. |
| Fiber | Firm: CERAMOPTEE Type: OPTRAN WF Core diameter: 100micrometers 1st connector:AMP 501003-1, FSMA905 125um; drilled 125micrometers->140micrometers 2nd connector: Amphenol, SMA906-122-5004 drilled 125micrometers->140micrometers Microlens: Type FISBA; r=0.7mm, d=1.1mm, l=2.0mm glue: Plytec, EpoTek 301 |
| Collimator | F/4.5 F=360 mm |
| Grating | 31.6 grooves/mm blaze angle 63.4o |
| Crossdisperser | 300 grooves/mm blaze wavelength 5000 angströms |
| Camera | F/2.8 F=300 mm |
| CCD | EEV 1152 x 770 pixels 22 microns pixels LN2 cooled |
| Crossdisperser | 400 grooves/mm blaze wavelength 3900 angströms |
| Camera | F/2.8 F=300 mm UV transmitance down to 3500 angströms |
| CCD | EEV 2000 x 800 pixels 15 microns pixels LN2 cooled |
| Useful links |