Impact of Distance Determinations on Galactic Structure. I. Young and Intermediate-Age Tracers |
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Authors: | Noriyuki Matsunaga Giuseppe Bono Xiaodian Chen Richard de Grijs Laura Inno Shogo Nishiyama |
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Institution: | 1.Department of Astronomy,The University of Tokyo,Tokyo,Japan;2.Dipartimento di Fisica,Universitá di Roma Tor Vergata,Rome,Italy;3.INAF,Osservatorio Astronomico di Roma,Monte Porzio Catone,Italy;4.Key Laboratory for Optical Astronomy, National Astronomical Observatories,Chinese Academy of Sciences,Beijing,China;5.Kavli Institute for Astronomy & Astrophysics and Department of Astronomy,Peking University,Beijing,China;6.Department of Physics and Astronomy,Macquarie University,North Ryde,Australia;7.International Space Science Institute, Beijing,Beijing,China;8.Max-Planck Institute for Astronomy,Heidelberg,Germany;9.Miyagi University of Education,Sendai,Japan |
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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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