HeI6678 observations in delta Sco

[Ernst Pollmann]

Dear colleagues,
almost at the end of the visibility (at least in Europe) here a conclusion of He6678 observations mainly of members of the ARAS group (and some others).
The V/R measurements of ten cycles led to a period of 550 (+/-) 2 days. Compare the result published in Be Star Newsletter: 40-2012 with 541 (+/-) 15 days of 5 cycles.
Any comments are welcome!


Ernst Pollmann
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ASPA-Active Spectroscopy in Astronomy
http://www.astrospectroscopy.de
http://www.astronomie.de/astronomische-fachgebiete

[Francois Teyssier]

Dear Ernst,
Very impressive long time survey. Congratulations.
Hoping that your perseverance could become a model for many amateurs.
Best regards,
François