Lithium-6 in HD 82943
This chart represents the spectrum of HD 82943, showing the region around the Lithium absorption line. The general shape of this spectral line is caused by Lithium-7 atoms in the atmosphere of the star, while the presence of Lithium-6 causes a certain asymmetry. Model computations have been used to calculate the amount of the two Lithium isotopes; the two fully drawn curves correspond to 6 Li/ 7 Li = 0.12 (red) and no Lithium-6 (0.00; blue), respectively. The difference (O-C = Observed - Calculated) is shown below and demonstrates the very good fit for an isotopic ratio of 0.12 (red dots).
Technical information: this image shows the spectrum of the V = 6.5 mag star HD 82943, as obtained on June 7, 2000, with the UVES spectrograph at the 8.2-m VLT KUEYEN telescope. It is based on three exposures made with Image Slicer 3 in Director's Discretionary Time in Service Mode, and each lasting 120 sec. The spectral resolution is 110,000 and the final S/N-ratio is about 500.
Credit:
ESO
About the Image
| Id: | eso0118b |
| Type: | Chart |
| Release date: | 9 May 2001 |
| Related releases: | eso0118 |
| Size: | 2775 x 2706 px |
About the Object
| Name: | HD 82943 |
| Type: | • Milky Way : Star : Circumstellar Material : Planetary System • X - Stars |
Colours & filters
| Band | Wavelength | Telescope |
| Optical R |
670 nm | Very Large Telescope UVES |
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