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.

Kredit:

ESO

O snímku

Id:eso9936d
Typ:Pozorování
Datum zveřejnění:20. července 1999
Související články:eso9936
Velikost:960 x 723 px

O objektu

Jméno:NN Serpentis, Spectrum
Typ:Milky Way : Star : Grouping : Binary
Vzdálenost:1500 světelné roky
Kategorie:Stars

Image Formats

největší JPEG
100,4 KB

Barvy & filtry

PásmoDalekohled
Infračervený
Near-IR
Very Large Telescope
FORS1
OptickýVery Large Telescope
FORS1