A raw spectrum, straight from the HARPS
The light of a star was dispersed according to its colours, or wavelengths, in a very long strip. The optical elements in the spectrograph chop this long spectrum in a series of shorter ones which are positioned one after the other on the two detectors of the instrument. In order to measure the wavelength with a very high accuracy, the light from a laser comb (eso0826) is also dispersed by the spectrograph, and forms a second series of lines just next to the spectrum of the star. The light from the laser comb appears as a series of dots, whose position is well known and serve as reference.
Credit:ESO
Over de afbeelding
Id: | harps_cc |
Type: | Observatie |
Publicatiedatum: | 2 oktober 2014 09:10 |
Grootte: | 4300 x 4100 px |
Over het object
Type: | Unspecified : Technology : Observatory : Instrument |
Categorie: | La Silla |