机译:The spectroscopic and astrometric parallaxes of three dwarf novae: The nature of the secondary stars of U Geminorum, SS Aurigae, and SS Cygni
New Mexico State Univ, Dept Astron, Las Cruces, NM 88003, USA, .;
Novae; cataclysmic variables; Stars : fundamental parameters; Stars : individual (ss aurigae; ss cygni; u geminorum); 8190-a sodium doublet; Cataclysmic variables; White-dwarf; Too cool; Colors; Kinematics; Evolution; Outbursts; Sequence; Catalog;