Stellar Populations of NSC and NSD Virtual Observatory Resource

Authors
  1. Feldmeier-Krause A.
  2. Published by
    CDS
Abstract

The Milky Way nuclear star cluster (NSC) is located within the nuclear stellar disc (NSD) in the Galactic Centre. It is not fully understood if the formation and evolution of these two components are connected, and how they influence each other. We study the stellar populations in the transition region of NSC and NSD. We observed two ~4.3pc^2^ fields with the integral-field spectrograph KMOS (VLT), located at r~20pc (>4Re) to the Galactic East and West of the NSC. We extract and analyse medium-resolution stellar spectra of >200 stars per field. The data contain in total nine young star candidates. We use stellar photometry to estimate the stellar masses, effective temperatures, and spectral types of the young stars. The stars are consistent with an age of 4-6Myr, they may have formed inside the Quintuplet cluster, but were dispersed in dynamical interactions. Most stars in the two fields are red giant stars, and we measure their stellar metallicities [M/H] using full spectral fitting. We compare our [M/H] distributions to the NSC and NSD, using data from the literature, and find that the overall metallicity decreases from the central NSC, over the transition region, to the NSD. The steep decrease of [M/H] from the NSC to the region dominated by the NSD indicates that the two components have distinct stellar populations and formation histories.

Keywords
  1. Milky Way Galaxy
  2. Late-type stars
  3. Infrared sources
  4. Effective temperature
  5. Radial velocity
  6. Chemical abundances
Bibliographic source Bibcode
2022MNRAS.513.5920F
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/513/5920
IVOA Identifier IVOID
ivo://CDS.VizieR/J/MNRAS/513/5920

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/513/5920
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/513/5920
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/513/5920
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/513/5920/tableb1?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/513/5920/tableb1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/513/5920/tableb1?

History

2022-08-30T12:23:58Z
Resource record created
2022-08-30T12:23:58Z
Created
2023-08-02T11:04:34Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr