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SW Sextantis variable
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<p>SW Sextantis variable stars are a kind of <a href="/facts/Cataclysmic_variable/QgRCfaYj">cataclysmic variable</a> star; they are double-star systems in which there is mass transfer from a <a href="/facts/Red_dwarf/56CMQcF0">red dwarf</a> to a <a href="/facts/White_dwarf/gIYlTtrC">white dwarf</a> forming a stable <a href="/facts/Accretion_disk/8zJXshat">accretion disc</a> around the latter. Unlike other non-magnetic cataclysmic variables, the <a href="/facts/Emission_spectrum/fxumR717">emission lines</a> from hydrogen and helium are not doubled, except briefly near phase 0.5. </p>