AAVSO Alert Notice 440: PEP Observing Campaign on P CygniAAVSO Alert Notice 440: PEP Observing Campaign on P Cygni
AAVSO Alert Notice 440<br /> PEP Observing Campaign on P Cygni<br /> May 17, 2011 <p>Ernst Pollmann, Chairman of the VdS-Spectroscopy-Group in Germany and an ative spectroscopist, has requested the assistance of AAVSO