Abstract
Here we discuss impacts of distance determinations on the Galactic disk traced by relatively young objects. The Galactic disk, \(\sim40~\mbox{kpc}\) 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.
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Acknowledgements
We thank the organizers and participants of ISSI-BJ for the inspiring discussions therein. NM is grateful to Grant-in-Aid, KAKAENHI No. 26287028, from the Japan Society for the Promotion of Science (JSPS). RdG acknowledges research support from the National Natural Science Foundation of China (grants U1631102, 11373010, and 11633005). SN was supported by JSPS KAKENHI (Nos. 25707012, 15K13463).
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Astronomical Distance Determination in the Space Age
Edited by Richard de Grijs and Maurizio Falanga
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Matsunaga, N., Bono, G., Chen, X. et al. Impact of Distance Determinations on Galactic Structure. I. Young and Intermediate-Age Tracers. Space Sci Rev 214, 74 (2018). https://doi.org/10.1007/s11214-018-0506-5
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DOI: https://doi.org/10.1007/s11214-018-0506-5