Massive star clusters NGC 419 and NGC 1846 Virtual Observatory Resource

Authors
  1. Song Y.-Y.
  2. Mateo M.
  3. Mackey A.D.
  4. Olszewski E.W.
  5. Roederer I.U.,Walker M.G.
  6. Bailey J.I.
  7. Published by
    CDS
Abstract

As an introduction of a kinematic survey of Magellanic Cloud (MC) star clusters, we report on the dynamical masses and mass-to-light ratios (M/L) of NGC 419 (Small Magellanic Cloud) and NGC 1846 (Large Magellanic Cloud). We have obtained more than one hundred high-resolution stellar spectra in and around each cluster using the multi-object spectrograph M2FS on the Magellan/Clay Telescope. Line-of-sight velocities and positions of the stars observed in each cluster were used as input to an expectation-maximization algorithm used to estimate cluster membership probabilities, resulting in samples of 46 and 52 likely members (P_M_>=50 per cent) in NGC 419 and NGC 1846, respectively. This process employed single-mass King models constrained by the structural parameters of the clusters and provided self-consistent dynamical mass estimates for both clusters. Our best-fitting results show that NGC 419 has a projected central velocity dispersion of 2.44^+0.37^_-0.21_km/s, corresponding to a total mass of 7.6^+2.5^_-1.3_x10^4^M_{sun}_ and V-band M/L ratio of 0.22^+0.08^_-0.05_ in solar units. For NGC 1846, the corresponding results are 2.04^+0.28^_-0.24_km/s, 5.4^+1.5^_-1.4_x10^4^M_{sun}_, and 0.32^+0.11^_-0.11_. The mean metallicities of NGC 419 and NGC 1846 are found to be [Fe/H]=-0.84+/-0.19 and -0.70+/-0.08, respectively, based on the spectra of likely cluster members. We find marginal statistical evidence of rotation in both clusters, though in neither cluster does rotation alter our mass estimates significantly. We critically compare our findings with those of previous kinematic studies of these two clusters in order to evaluate the consistency of our observational results and analytic tools.

Keywords
  1. Open star clusters
  2. Magellanic Clouds
  3. Radial velocity
  4. Infrared photometry
  5. Optical astronomy
  6. Photometry
  7. Spectroscopy
Bibliographic source Bibcode
2019MNRAS.490..385S
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/490/385
IVOA Identifier IVOID
ivo://CDS.VizieR/J/MNRAS/490/385

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/490/385
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/490/385
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/490/385
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/490/385/table4?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/490/385/table4?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/490/385/table4?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/490/385/table5?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/490/385/table5?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/490/385/table5?

History

2023-02-17T12:47:17Z
Resource record created
2023-02-17T12:47:17Z
Created
2023-07-31T11:11:34Z
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