Impact of distance determinations on Galactic structure. I. Young and intermediate-age tracers

Noriyuki Matsunaga*, Giuseppe Bono, Xiaodian Chen, Richard de Grijs, Laura Inno, Shogo Nishiyama

*Corresponding author for this work

Research output: Contribution to journalReview article

10 Citations (Scopus)

Abstract

Here we discuss impacts of distance determinations on the Galactic disk traced by relatively young objects. The Galactic disk, ∼40kpc in diameter, is a cross-road of studies on the methods of measuring distances, interstellar extinction, evolution of galaxies, and other subjects of interest in astronomy. A proper treatment of interstellar extinction is, for example, crucial for estimating distances to stars in the disk outside the small range of the solar neighborhood. We’ll review the current status of relevant studies and discuss some new approaches to the extinction law. When the extinction law is reasonably constrained, distance indicators found in today and future surveys are telling us stellar distribution and more throughout the Galactic disk. Among several useful distance indicators, the focus of this review is Cepheids and open clusters (especially contact binaries in clusters). These tracers are particularly useful for addressing the metallicity gradient of the Galactic disk, an important feature for which comparison between observations and theoretical models can reveal the evolution of the disk.

Original languageEnglish
Article number74
Pages (from-to)1-36
Number of pages36
JournalSpace Science Reviews
Volume214
Issue number4
DOIs
Publication statusPublished - 1 Jun 2018

Keywords

  • Cepheids: distance scale
  • Stars: variables

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