Spectroscopic results for Delta Sco since 2010

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Dates Number of spectra Spectral resolution
RV, km/s
HeII 4686 Halpha
2010, May 28 - Aug 5 > 100 70,000   -2 ± 2
2010, May 28 - Aug 5 > 100 70,000 -9 ± 3  
2011, Jan 10 - Feb. 9 5 11,000 -10.8 ± 2.6 -16.5±0.9
2011, Jan 28 5 48,000 -11.5 ± 0.7  
2011, Jan.28 - 30 2 17,000   -15.5±0.2
2011, Feb. 9 1 17,000   -19.3±1.0
2011, Feb. 17 - 22 2 17,000   -18.3±0.4
2011, Mar. 1 - 12 5 17,000   -16.4±1.4
2011, Mar. 9 - 10 2 10,000 -10.0± 0.5 -18.5±1.5
2011, Mar. 26 1 12,800   -20
2011, Mar. 29 1 17,000   -17.4±0.8
2011, Apr. 5 - 6 2 10,000 -10.7 ± 3.6 -23.0±0.7
2011, April 6 1 17,000   -23.0±0.9
2011, Apr. 8 1 12,800   -18
2011, Apr. 9 2 10,700 & 18750   -17.4±0.7
2011, Apr. 15 1 10,700   -18
2011, Apr. 24 - 25 2 17,000   -20.5±0.6
2011, Apr 27 - 30 2 17,000   -20.5±1.5
2011, May 3 1 10,000 -14 -20.3
2011, May 7 1 17,000   -22.0±0.7
2011, May 9 1 17,000   -22.2±0.7
2011, May 18 1 9,500   -21.7
2011, May 20 1 17,000   -20.8
2011, May 21 1 17,000  -13.4 -20.8
2011, May 28 1 11,000  -13.8 -24.9
2011, May 29 1 7,500   -24.1
2011, June 7-16 24 70,000 -29.7  
2011, June 11 1 17,000   -19.0±0.2
2011, June 14 1 17,000   -31.7±0.8
2011, June 16 1 17,000   -34.9±0.3
2011, June 26 1 11,000 -42.9  
2011, June 27 1 17,000   -54.3±0.1
2011, June 29 4 15,000 -47.5  
2011, July 1 1 11,000 -51.5  
2011, July 1 1 17,000   -58.6±0.1
2011, July 2 2 11,000; 15,000 -55.4±1.8  
2011, July 3-4 2 11,000 -56.5±1.9  

Comments: Changes in the radial velocity of the Halpha line in January 2011 may not reflect the orbital motion, but rather a changing disk density distribution. Observations of the photospheric lines (He II 4686 A) are needed.

All the results are preliminary.

Last updated: 5-Jul-2011