Phase-space structures and stellar populations in the star-forming region NGC 2264

DOI: 
10.1093/mnras/stw2855
Publication date: 
01/02/2017
Main author: 
González, Marta
IAA authors: 
González, Marta;Alfaro, Emilio J.
Authors: 
González, Marta;Alfaro, Emilio J.
Journal: 
Monthly Notices of the Royal Astronomical Society
Refereed: 
Yes
Publication type: 
Article
Volume: 
465
Pages: 
1889-1897
Abstract: 

In this work, we analyse the structure of a subspace of the phase space of the star-forming region NGC 2264 using the spectrum of kinematic groupings (SKG). We show that the SKG can be used to process a collection of star data to find substructure at different scales. We have found structure associated with the NGC 2264 region and also with the background area. In the NGC 2264 region, a hierarchical analysis shows substructure compatible with that found in previous specific studies of the area but with an objective, compact methodology that allows us to homogeneously compare the structure of different clusters and star-forming regions. Moreover, this structure is compatible with the different ages of the main NGC 2264 star-forming populations. The structure found in the field can be roughly associated with giant stars far in the background, dynamically decoupled from NGC 2264, which could be related either with the Outer Arm or Monoceros Ring. The results in this paper confirm the relationship between structure in the radial velocity phase-space subspace and different kinds of populations, defined by other variables not necessarily analysed with the SKG, such as age or distance, showing the importance of detecting phase-space substructure in order to trace stellar populations in the broadest sense of the word.

Database: 
ADS
SCOPUS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85022216758&doi=10.1093%2fmnras%2fstw2855&partnerID=40&md5=a63c5b4fe15be29586f0b36f4fe5905d
ADS Bibcode: 
2017MNRAS.465.1889G
Keywords: 
methods: data analysis;methods: statistical;stars: kinematics and dynamics;Galaxy: kinematics and dynamics;open clusters and associations: general;open clusters and associations: individual: NGC 2264;Astrophysics - Astrophysics of Galaxies;Astrophysics - Instrumentation and Methods for Astrophysics