Period-luminosity relations for Galactic Cepheid variables with independent distance measurements
Chow-Choong Ngeow, Shashi Kanbur
Abstract
In this paper, we derive the period-luminosity (PL) relation for Galactic Cepheids with recent independent distance measurements from open cluster, Barnes-Evans surface brightness, interferometry and HST astrometry techniques. Our PL relation confirms the results of Tammann et al. (2003), which showed that the Galactic Cepheids follow a different PL relation to their LMC counterparts. Our results also show that the slope of the Galactic PL relation is inconsistent with the LMC slope with more than 95% confidence level. We apply this Galactic PL relation to find the distance to NGC 4258. Our result of muo=29.490.06(random error)mag. agrees at the ~1.4sigma level with the geometrical distance of μgeo=29.280.15mag. from water maser measurements..
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