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The separation of the Milky Way disk into a thin and thick component is supported by differences in the spatial, kinematic and metallicity distributions of their stars. These differences have led to the view that the thick disk formed early…

Astrophysics of Galaxies · Physics 2015-05-20 Sarah R. Loebman , Rok Roskar , Victor P. Debattista , Zeljko Ivezic , Thomas R. Quinn , James Wadsley

We examine the clustering and kinematics of young stellar objects (YSOs) in the North America/Pelican Nebulae, as revealed by Gaia astrometry, in relation to the structure and motions of the molecular gas, as indicated in molecular line…

Astrophysics of Galaxies · Physics 2020-08-26 Michael A. Kuhn , Lynne A. Hillenbrand , John M. Carpenter , Angel Rodrigo Avelar Menendez

Recent observations have shown that star-forming galaxies like our own Milky Way evolve kinematically into ordered thin disks over the last ~8 billion years since z=1.2, undergoing a process of "disk settling." For the first time, we study…

Astrophysics of Galaxies · Physics 2015-06-22 Susan A. Kassin , Alyson Brooks , Fabio Governato , Benjamin J. Weiner , Jonathan P. Gardner

The Vela-Puppis region is known to host the Vela OB2 association as well as several young clusters featuring OB and pre-main sequence stars. Several spatial and kinematic subgroups have been identified in the recent years. By grouping stars…

Sun-like stars are well represented in the solar neighbourhood but are currently under-utilised, with many studies of chemical and kinematic evolution focusing on red giants (which can be observed further away) or turn-off stars (which have…

Solar and Stellar Astrophysics · Physics 2024-12-13 Christian Lehmann , Michael T. Murphy , Fan Liu , Chris Flynn

We use the extensive $Gaia$ Data Release 2 set of Long Period Variables to select a sample of Oxygen-rich Miras throughout the Milky Way disk and bulge for study. Exploiting the relation between Mira pulsation period and stellar…

Astrophysics of Galaxies · Physics 2020-01-15 J. Grady , V. Belokurov , N. W. Evans

The concept of kinematic assemblages evolving from dispersed stellar clusters has remained contentious since Eggen's initial formulation of moving groups in the 1960's. With high quality parallaxes from the Hipparcos space astrometry…

Solar and Stellar Astrophysics · Physics 2015-05-18 Eric J. Bubar , Jeremy R. King

This is the first paper of a series aimed at studying the properties of late-type stars members of young stellar kinematic groups. We concentrate our study on classical young moving groups as: Local Association (Pleiades moving group, 20 -…

A simple model for the evolution of disc galaxies is presented. We adopt three numbers from observations of the Milky Way disc, the local surface mass density, the stellar scale length (of the assumedly exponential disc) and the amplitude…

Astrophysics · Physics 2009-11-11 Thorsten Naab , Jeremiah P. Ostriker

The projected distribution of stars in the Small Magellanic Cloud (SMC) from the Magellanic Clouds Photometric Survey is analysed. Stars of different ages are selected via criteria based on V magnitude and V-I colour, and the degree of…

Astrophysics · Physics 2011-07-21 M. Gieles , N. Bastian , B. Ercolano

The generation of spiral arms and the mechanisms controlling their properties within a realistic cosmological framework - the complete understanding is still beyond our grasp. Using a statistically significant sample of Milky Way- and…

Astrophysics of Galaxies · Physics 2025-10-31 Soumavo Ghosh , Elena D'Onghia

Using stellar kinematics measurements, we investigate the growth of massive, quiescent galaxies from z~2 to today. We present X-Shooter spectra from the UV to NIR and dynamical mass measurements of 5 quiescent massive (>10^11 Msun) galaxies…

Making use of the APOGEE DR17 catalogue with high quality data for 143,509 red giant branch stars we explore the strength of different mechanisms that causes a star to radially migrate in the Milky Way stellar disk. At any position in the…

Astrophysics of Galaxies · Physics 2024-12-13 Christian Lehmann , Sofia Feltzing , Diane Feuillet , Georges Kordopatis

The stellar populations in the inner kiloparsecs of the Milky Way (MW) show complex kinematical and chemical structures. The origin and evolution of these structures is still under debate. Here we study the central region of a fully…

Astrophysics of Galaxies · Physics 2019-04-03 Tobias Buck , Melissa Ness , Aura Obreja , Andrea V. Macciò , Aaron A. Dutton

We present a detailed study of the kinematics of M dwarfs in the CARMENES (Calar Alto high-Resolution search for M dwarfs with Exoearths with Near-infrared and optical Echelle Spectrographs) input catalog. We have selected all M dwarfs with…

Solar and Stellar Astrophysics · Physics 2016-02-03 D. Montes , J. A. Caballero , I. Gallardo , M. Cortes-Contreras , F. J. Alonso-Floriano

The star-forming region W5 is a major part of the Cassiopeia OB6 association. Its internal structure and kinematics may provide hints of the star formation process in this region. Here, we present a kinematic study of young stars in W5…

Astrophysics of Galaxies · Physics 2023-08-16 Beomdu Lim , Jongsuk Hong , Jinhee Lee , Hyeong-Sik Yun , Narae Hwang , Byeong-Gon Park

We use kinematical and chemical properties of 754 Corot stars to characterise the stellar populations of the Milky Way disc in three beams close the Galactic plane. From the atmospheric parameters derived in Gazzano et al. (2010) with the…

Astrophysics of Galaxies · Physics 2015-06-12 J. -C. Gazzano , G. Kordopatis , M. Deleuil , P. de Laverny , A. Recio-Blanco , V. Hill

Gaia DR2 provides unprecedented precision in measurements of the distance and kinematics of stars in the solar neighborhood. Through applying unsupervised machine learning on DR2's 5-dimensional dataset (3d position + 2d velocity), we…

Astrophysics of Galaxies · Physics 2019-09-04 Marina Kounkel , Kevin Covey

We have used the velocity dispersion as an age indicator to constrain the ages of a large sample of main sequence Vega-like stars in order to study the lifetimes and temporal evolution of the dust disks around them. We use HIPPARCOS…

Astrophysics · Physics 2009-11-10 P. Manoj , H. C. Bhatt

We present a study of the three dimensional structure, kinematics, and age distribution of the Orion OB association, based on the second data release of the Gaia satellite (Gaia DR2). Our goal is to obtain a complete picture of the star…

Solar and Stellar Astrophysics · Physics 2019-08-21 E. Zari , A. G. A. Brown , P. T. de Zeeuw