Keywords: Kcore.jpg en Emission profile in the core of the K line of KW 326 a dwarf star in the Praesepe open cluster The width W0 is defined as the difference in wavelength between the point on either side of the profile at half intensity between the K1 minimum and the K2 maximum The spectrum was taken with the UVES spectrograph at the Very Large Telescope and it is now publicly available in the ESO archive own Giancarlo Pace 2010-07-22 Own work Public domain Check categories 2010 July 24 en wikipedia Wilson “Bappu_effect Physics 1 Astronomical spectroscopy |