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Τι (ποιος) είναι UBV photometric system - ορισμός
UBV photometric system
WIDE BAND PHOTOMETRIC SYSTEM USED IN ASTRONOMY
UBV system; Ubv system; Ubv System; UBV filter; UBV Filters; UBV filters; UBV Filter; UBVRI system; Ultraviolet-Blue-Violet; UBVRI; Johnson magnitude; Johnson-Morgan system; Johnson-Cousins photometric system; I band (infrared); UBVRI Filters
The photometric system called UBV (from Ultraviolet, Blue, Visual), also called the Johnson system (or Johnson-Morgan system), is a wide central band of the electromagnetic spectrum, and usually employed for classifying stars according to their colors.
Strömgren photometric system
MEDIUM-BAND PHOTOMETRIC SYSTEM
Stromgren photometric system; Strömgren photometry; Strömgren-Crawford photometry; Strömgren-Crawford photometric system; Stromgren-Crawford photometry; Stroemgren photometric system; Stromgren-Crawford photometric system; Stroemgren photometry; Stroemgren-Crawford photometry; Stroemgren-Crawford photometric system; Stromgren photometry; Four-colour photometry; Uvby; Uvby system
The Strömgren photometric system, abbreviated also as uvbyβ or simply uvby, and sometimes referred as Strömgren - Crawford photometric system, is a four-colour medium-passband photometric system plus Hβ (H-beta) filters for determining magnitudes and obtaining spectral classification of stars. Its use was pioneered by the Danish astronomer Bengt Strömgren in 1956 and was extended by his colleague the American astronomer David L.
Ultraviolet/Optical Telescope
In astronomical photometry, the Ultraviolet and Optical Telescope (UVOT) on the Neil Gehrels Swift Observatory observes astronomical objects in its 17-by-17 arc minute field of view through one of several filters or grisms. The seven filters, which are similar to those on the XMM-Newton-OM (Optical Monitor) instrument, cover the near-ultraviolet and optical range.
