Other
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...252..269y&link_type=abstract
Astrophysical Journal, Part 1, vol. 252, Jan. 1, 1982, p. 269-276. Research supported by the Science Research Council of Englan
Other
8
Binary Stars, Magnetic Stars, Radial Velocity, Spectral Line Width, Stellar Spectra, Balmer Series, Emission Spectra, H Lines, Helium, Light Curve
Scientific paper
The magnetic binary 2A 0311-227 is observed for more than three orbits on each of two nights with 1 A spectral resolution and 120 s temporal resolution. The radial velocity variations of the strong Balmer, He I, and He II emission lines in the region 4110-5050 A are investigated. It is noted that the emission lines are distinctly from cycle to cycle. For approximately 50% of the time, the lines consist of a single broad component (sometimes with hints of substructure) phased with the 81 minute orbital period. At other times, a second 'sharp' emission component appears in all lines, most notably in He II 4686 A. The sharp component possesses an 81 minute radial velocity period, with K equal to 600 km/s. It lags the broad component in phase by 55 deg. Other components are seen transiently but do not reproduce from cycle to cycle, including a high velocity component observed at +1200 km/s. It is noted that the multiple emission components cannot be due to magnetic effects and that the sharp component has too large a velocity to represent orbital motion.
Boksenberg Alec
Sargent Wallace L. W.
Schneider David P.
Young Patrick
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