Time resolved spectroscopy of long-period DQ Herculis stars

Details Time resolved spectroscopy of long-period DQ Herculis stars Time resolved spectroscopy of long-period DQ Herculis stars

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...289..300p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 289, Feb. 1, 1985, p. 300-309.

Astronomy and Astrophysics

Astrophysics

49

Binary Stars, Cataclysmic Variables, Dwarf Novae, Magnetic Stars, Stellar Motions, Stellar Spectra, Accretion Disks, Astronomical Spectroscopy, Helium, Power Spectra, Stellar Models, White Dwarf Stars, X Rays

Scientific paper

High-dispersion time-resolved spectroscopic observations of four long-period DQ Herculis stars (intermediate polars) are presented: V1223 Sgr, H2215 - 086, 3A 0729 + 103, and AO Psc. In two of these objects orbital modulations were clearly detected, permitting an investigation of dynamic parameters. The source of He II line emission appears to have a physically different location from that of hydrogen. The source of He II is placed in the hot spot or accreting stream. In all four objects short-period coherent variations in wavelength were discovered. The periods in each case turned out to be close to, and within error the same as, the photometric white-dwarf coherent periods. This lends the strongest kinematic evidence to date in support of an oblique magnetic rotator model.

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