NN Ser Spectrum during Total Eclipse
This chart represents the spectrum of the cool dwarf star in the variable stellar system NN Ser . The 5 min exposure was obtained during the total phase of the eclipse, when the magnitude of the system was V = 23.0. Several TiO bands are clearly visible in this slightly smoothed tracing. A few deep and narrow "absorption" features are residuals from sky subtraction. The original resolution is 0.55 nm/pix. A spectral type of M6 or later is deduced for NN Ser . The spectrum of a more nearby (and hence much brighter) M6.5 dwarf star (temperature approx. 2600 degrees) is shown below for comparison.
Credit:
ESO
About the Image
| Id: | eso9936d |
| Type: | Chart |
| Release date: | 20 July 1999 |
| Related releases: | eso9936 |
| Size: | 960 x 723 px |
About the Object
| Name: | NN Serpentis, Spectrum |
| Type: | • Milky Way : Star : Grouping : Binary • X - Stars |
| Distance: | 1500 light years |
Colours & filters
| Band | Telescope |
| Optical | Very Large Telescope FORS1 |
| Infrared Near-IR |
Very Large Telescope FORS1 |
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