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Title: New Classical Cepheids in the Inner Part of the Northern Galactic Disk, and Their Kinematics

Abstract

The characteristics of the inner Galaxy remain obscured by significant dust extinction, hence infrared surveys are useful for finding young Cepheids whose distances and ages can be accurately determined. A near-infrared photometric and spectroscopic survey was carried out and three classical Cepheids were unveiled in the inner disk, around 20° and 30° in Galactic longitude. The targets feature small Galactocentric distances, 3–5 kpc, and their velocities are important, as they may be under the environmental influence of the Galactic bar. While one of the Cepheids has a radial velocity consistent with the Galactic rotation, the other two are moving significantly slower. We also compare their kinematics with that of high-mass star-forming regions with measured parallactic distances.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6]
  1. Department of Astronomical Science, School of Physical Sciences, SOKENDAI (The Graduate University for Advanced Studies), Mitaka, Tokyo 181-8588 (Japan)
  2. Department of Astronomy, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan)
  3. Koyama Astronomical Observatory, Kyoto Sangyo University, Motoyama, Kamigamo, Kita-ku, Kyoto 603-8555 (Japan)
  4. Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg (Germany)
  5. Instituto Nazionale de Astrofisica, Osservatorio Astronomico di Roma, Via Frascati 33, I-00040 Monte Porzio Catone (Italy)
  6. Laboratory of Infrared High-resolution spectroscopy (LiH), Koyama Astronomical Observatory, Kyoto Sangyo University, Motoyama, Kamigamo, Kita-ku, Kyoto 603-8555 (Japan)
Publication Date:
OSTI Identifier:
22663478
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 842; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CEPHEIDS; COMPARATIVE EVALUATIONS; DUSTS; GALAXIES; INFRARED SURVEYS; MASS; RADIAL VELOCITY; ROTATION

Citation Formats

Tanioka, Satoshi, Matsunaga, Noriyuki, Fukue, Kei, Inno, Laura, Bono, Giuseppe, and Kobayashi, Naoto, E-mail: matsunaga@astron.s.u-tokyo.ac.jp. New Classical Cepheids in the Inner Part of the Northern Galactic Disk, and Their Kinematics. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA7260.
Tanioka, Satoshi, Matsunaga, Noriyuki, Fukue, Kei, Inno, Laura, Bono, Giuseppe, & Kobayashi, Naoto, E-mail: matsunaga@astron.s.u-tokyo.ac.jp. New Classical Cepheids in the Inner Part of the Northern Galactic Disk, and Their Kinematics. United States. doi:10.3847/1538-4357/AA7260.
Tanioka, Satoshi, Matsunaga, Noriyuki, Fukue, Kei, Inno, Laura, Bono, Giuseppe, and Kobayashi, Naoto, E-mail: matsunaga@astron.s.u-tokyo.ac.jp. Tue . "New Classical Cepheids in the Inner Part of the Northern Galactic Disk, and Their Kinematics". United States. doi:10.3847/1538-4357/AA7260.
@article{osti_22663478,
title = {New Classical Cepheids in the Inner Part of the Northern Galactic Disk, and Their Kinematics},
author = {Tanioka, Satoshi and Matsunaga, Noriyuki and Fukue, Kei and Inno, Laura and Bono, Giuseppe and Kobayashi, Naoto, E-mail: matsunaga@astron.s.u-tokyo.ac.jp},
abstractNote = {The characteristics of the inner Galaxy remain obscured by significant dust extinction, hence infrared surveys are useful for finding young Cepheids whose distances and ages can be accurately determined. A near-infrared photometric and spectroscopic survey was carried out and three classical Cepheids were unveiled in the inner disk, around 20° and 30° in Galactic longitude. The targets feature small Galactocentric distances, 3–5 kpc, and their velocities are important, as they may be under the environmental influence of the Galactic bar. While one of the Cepheids has a radial velocity consistent with the Galactic rotation, the other two are moving significantly slower. We also compare their kinematics with that of high-mass star-forming regions with measured parallactic distances.},
doi = {10.3847/1538-4357/AA7260},
journal = {Astrophysical Journal},
number = 2,
volume = 842,
place = {United States},
year = {Tue Jun 20 00:00:00 EDT 2017},
month = {Tue Jun 20 00:00:00 EDT 2017}
}