Galactic Cepheids and RR Lyrae multiplicity. I.

Classical Cepheids (CCs) and RR Lyrae stars (RRLs) are important classes of variable stars used as standard candles to estimate galactic and extragalactic distances. Their...经典造父变星（Classical Cepheids，CCs）与天琴座RR型变星（RR Lyrae stars，RRLs）是两类重要的变星，可作为标准烛光（standard candles）用于估算银河系及河外星系的距离。它们的……