English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The universality of the Cepheid Period-Luminosity relations has been underdiscussion since metallicity effects have been assumed to play a role in thevalue of the intercept and, more recently, of the slope of these relations. Thegoal of the present study is to calibrate the Galactic PL relations in variousphotometric bands (from B to K) and to compare the results to thewell-established PL relations in the LMC. We use a set of 59 calibrating stars,the distances of which are measured using five different distance indicators:Hubble Space Telescope and revised Hipparcos parallaxes, infrared surfacebrightness and interferometric Baade-Wesselink parallaxes, and classicalZero-Age-Main-Sequence-fitting parallaxes for Cepheids belonging to openclusters or OB stars associations. A detailed discussion of absorptioncorrections and projection factor to be used is given. We find no significantdifference in the slopes of the PL relations between LMC and our Galaxy. Weconclude that the Cepheid PL relations have universal slopes in all photometricbands, not depending on the galaxy under study (at least for LMC and MilkyWay). The possible zero-point variation with metal content is not discussed inthe present work, but an upper limit of 18.50 for the LMC distance modulus canbe deduced from our data.

A new calibration of Galactic Cepheid Period-Luminosity relations from B to K bands, and a comparison to LMC PL relations