NGC 2419: an "intergalactic wanderer" or a simple Galactic Globular Cluster?
M. Di Criscienzo, C. Greco, M. Dall'Ora, V. Ripepi, G. Clementini, M., Marconi, L. Federici, L. Di Fabrizio, I. Musella, L. Baldacci, M. Maio
TL;DR
This study provides new photometric data and variable star analysis of NGC 2419, confirming its classification as an Oosterhoff type II globular cluster and offering insights into its nature.
Contribution
The paper presents a comprehensive new photometric survey of NGC 2419, discovering numerous variable stars and refining its classification.
Findings
39 new RR Lyrae stars identified
11 SX Phoenicis stars discovered
Confirms NGC 2419 as an Oosterhoff type II cluster
Abstract
We have carried out a new photometric study of the remote Galactic globular cluster NGC 2419, using proprietary and archive B,V,I time-series CCD photometry of the cluster, that allowed us to discover a large number of new variable stars and to obtain a new colour magnitude diagram that reaches V ~26 mag over a field of 50X43 square arcmin centered on NGC 2419. The new variables include 39 RR Lyrae and 11 SX Phoenicis stars. The pulsation properties of the new RR Lyrae stars confirm and strengthen the classification of NGC 2419 as an Oosterhoff type II cluster.
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Astrophysics and Star Formation Studies