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

Distances and extinction values are usually degenerate. To refine thedistance to the general Galactic Center region, a carefully determinedextinction law (taking into account the prevailing systematic errors) isurgently needed. We collected data for 55 classical Cepheids projected towardthe Galactic Center region to derive the near- to mid-infrared extinction lawusing three different approaches. The relative extinction values obtained areAJ/AKs = 3.005, AH/AKs = 1.717, A[3.6]/AKs = 0.478, A[4.5]/AKs = 0.341,A[5.8]/AKs = 0.234, A[8.0]/AKs = 0.321, AW1/AKs = 0.506, and AW2/AKs = 0.340.We also calculated the corresponding systematic errors. Compared with previouswork, we report an extremely low and steep mid-infrared extinction law. Using aseven-passband 'optimal distance' method, we improve the mean distanceprecision to our sample of 55 Cepheids to 4%. Based on four confirmed GalacticCenter Cepheids, a solar Galactocentric distance of R_0 = 8.10\pm0.19\pm0.22kpc is determined, featuring an uncertainty that is close to the limitingdistance accuracy (2.8%) for Galactic Center Cepheids.

An extremely low mid-infrared extinction law toward the Galactic Center and 4% distance precision to 55 classical Cepheids