2A 0311-227 /EF Eridani/ - Radial velocities of two emission line components

Abstract

view Abstract Citations (9) References (11) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS 2A 0311-227 (EF Eri) : radial velocities of two emission line components. Young, P. ; Schneider, D. P. ; Sargent, W. L. W. ; Boksenberg, A. Abstract 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. Publication: The Astrophysical Journal Pub Date: January 1982 DOI: 10.1086/159553 Bibcode: 1982ApJ...252..269Y Keywords: Binary Stars; Magnetic Stars; Radial Velocity; Spectral Line Width; Stellar Spectra; Balmer Series; Emission Spectra; H Lines; Helium; Light Curve; Astrophysics full text sources ADS | data products SIMBAD (4)