Title of article :
REPORT: Helium λ 4009.27 Å Phase Variation in Alpha Virginis
Author/Authors :
Syed Zain, Sharifah Fetom university of malaya - Faculty of Science - Physics Department, Malaysia , Ahmad, Nazhatulshima university of malaya - Faculty of Science - Department of Physics, Malaysia , Zainuddin, Mohd Zambri university of malaya - Faculty of Science - Physics Department, Malaysia
Abstract :
The spectroscopic observations have been carried out with the SBIG Self-guided spectrograph attached to the Celestron CG-14 which utilizes the Schmidt-Cassegrain design of the University of Malaya observatory. The spectra of spica, a Vir (67 Virginis, HIP 65474, HR 5056, HD 116658, BD -10 3672, SAO 157923) were obtained on four nights that is 28th and 30th August 2005, 1st September 2005 and 21st February 2006. The medium-resolution (Rmin ~ 3710.349) spectrum was taken in the A range of 3900 to 4700 Å. Phase variation of He I λ0 4009.27Å has been studied and shows the spectroscopic binary characteristic of the Spica with variable velocity between -344.0 ± 2.25 to -140.0 ± 2.25 km/s.
Keywords :
Spectroscopic , eclipsing binary , variable velocity , Doppler effect , resolution
Journal title :
Malaysian Journal of Science
Journal title :
Malaysian Journal of Science
