Physics:J band (infrared)

From HandWiki
Atmospheric windows in the infrared. The J band is the transmission window (1.1 to 1.4 um) centred on 1.25 micrometres

In infrared astronomy, the J band refers to an atmospheric transmission window (1.1 to 1.4 um) centred on 1.25 micrometres (in the 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 clouds and other 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]

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. http://www.ipac.caltech.edu/2mass/releases/allsky/doc/sec1_6b.html#satr1. Retrieved 2011-12-28. 
  2. ↑ "Simbad object query:Jmag<-2 & Vmag>-9". SIMBAD Astronomical Database. http://simbad.u-strasbg.fr/simbad/sim-sam?Criteria=Jmag%3c-2%20%26%20Vmag%3e-9&OutputMode=LIST. Retrieved 2012-08-22. 
  3. ↑ "Infrared Astronomy Optical Filters". https://www.andovercorp.com/products/astronomy-filters/infrared-astronomy/. 
  4. ↑ Simons, D. A.; Tokunaga, A. T. (February 2002). "The Mauna Kea Observatories Near-Infrared Filter Set. I: Defining Optimal 1-5 $\mu$m Bandpasses". Publications of the Astronomical Society of the Pacific 114 (792): 169–179. doi:10.1086/338544. ISSN 0004-6280. 
  5. ↑ Pedretti, Ettore; Piacentini, S.; Corrielli, G.; Osellame, Roberto; Minardi, Stefano (2018-07-09). "A six-apertures discrete beam combiners for J-band interferometry". Optical and Infrared Interferometry and Imaging VI. 10701. SPIE. pp. 316–325. doi:10.1117/12.2312033. ISBN 9781510619555. Bibcode: 2018SPIE10701E..16P. https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10701/1070116/A-six-apertures-discrete-beam-combiners-for-J-band-interferometry/10.1117/12.2312033.full. 



Retrieved from "https://handwiki.org/wiki/index.php?title=Physics:J_band_(infrared)&oldid=3281259"