Delta Scorpii
Preliminary radial velocity curve
The He II 4686 A data between May 17 and August 14, 2011
Red circles - CFHT data (R=70,000), crosses - amateurs data (R=11,000-16,000), black circles - Tenerifre IAC80 campaign (2011 June 28 - July 8, R=15,000), blue circles - H-alpha data obtained in 2000 and shifted by one orbital period (Miroshnichenko et al. 2001).
The H-alpha data between May 20, 2011 and Agust 14, 2011
Symbols: open circles - amateur and professional data (R=9000-70000), red filled circles - Tenerife IAC80 campaign (R=20000).
The solid line on both plots is a theoretical prediction based on the orbital elements from Miroshnichenko et al. (2001) and orbital period from Tycner et al. (2011).
Both plots roughly agree with the periastron passage time prediction for 2011, July 6 (Tycner et al. 2011).
Last updated: 15-Aug-2011