J band (infrared)

Source: Wikipedia, the free encyclopedia.
Atmospheric windows in the infrared. The J band is the transmission window (1.1 to 1.4 um) centred on 1.25 micrometres

In

near-infrared
).

Betelgeuse is the brightest near-IR source in the sky with a J band magnitude of −2.99.[1] The next brightest stars in the J band are Antares (−2.7), R Doradus (−2.6), Arcturus (−2.2), and Aldebaran (−2.1).[2] In the J band Sirius is the 9th brightest star.

The J band is a frequent source of ground based observations since the wavelengths it covers pass through

atmospheric gasses.[3] The waveband does however suffer from contamination by water vapor lines and hydroxide emission lines leading to relatively high photometric error.[4]

It can be used to scrutinize the photosphere of giant and supergiant stars while mostly avoiding opacities from molecular bands and also has access to the 1080 nm He I line which is useful in the study of circumstellar disk interactions around T-Tauri stars.[5] J, H and K-band spectroscopy is also commonly used to observe and research brown dwarfs[6] and directly imaged exoplanets.[7]

References

  1. ^ R. Cutri and M. Skrutskie (2009-09-07). "Very Bright Stars in the 2MASS Point Source Catalog (PSC)". The Two Micron All Sky Survey at IPAC. Retrieved 2011-12-28.
  2. ^ "Simbad object query:Jmag<-2 & Vmag>-9". SIMBAD Astronomical Database. Retrieved 2012-08-22.
  3. ^ "Infrared Astronomy Optical Filters". www.andovercorp.com. Retrieved 2023-04-01.
  4. S2CID 7880289
    .
  5. S2CID 119458175
    .
  6. S2CID 16850733
    .
  7. S2CID 7173368
    .
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