UBV Photometric System
22,99 €
inkl. MwSt.

Versandfertig in 6-10 Tagen
  • Broschiertes Buch

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. UBV photometric system, also called the Johnson system (or Johnson-Morgan system), is a wide band photometric system for classifying stars according to their colors. It is first known standardized photoelectric photometric system. The letters U, B, and V stand for ultraviolet, blue, and visual magnitudes, which are measured for a star in order to classify it in the UBV system. The choice of colors on the blue end of the spectrum is because of the bias that…mehr

Andere Kunden interessierten sich auch für
Produktbeschreibung
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. UBV photometric system, also called the Johnson system (or Johnson-Morgan system), is a wide band photometric system for classifying stars according to their colors. It is first known standardized photoelectric photometric system. The letters U, B, and V stand for ultraviolet, blue, and visual magnitudes, which are measured for a star in order to classify it in the UBV system. The choice of colors on the blue end of the spectrum is because of the bias that photographic film has for those colors. It was introduced in the 1950s by American astronomers Harold Lester Johnson and William Wilson Morgan. The filters are selected in such manner, that the mean wavelengths of response functions are 364 nm for U, 442 nm for B, 540 nm for V. The zero point of the B-V and U-B color indices was defined to be zero for A0 V stars not affected by interstellar reddening.