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The discovery of an anomalous RGB in M 2

Lardo, C, Pancino, E, Mucciarelli, A and Milone, AP (2013) The discovery of an anomalous RGB in M 2. Memorie Della Società Astronomica Italiana, 84 (1). ISSN 0037-8720

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Using UV images taken with the Telescopio Nazionale Galileo, we discovered an anomalous sequence in the color-magnitude diagram of M 2. This feature appears as a narrow poor-populated red giant branch, which extends down to the sub giant branch region. We speculate that this new feature could be the extension of the faint component of the split sub giant branch recently discovered by Piotto et al. We identified in our UV images two CH stars detected in previous studies. These stars, which are both cluster members, fall on this redder sequence, suggesting indeed that the anomalous RGB should have a peculiar chemical pattern. Unfortunately, no additional spectra were obtained for stars in this previously unknown substructure

Item Type: Article
Uncontrolled Keywords: astro-ph.SR; astro-ph.SR
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Fabrizio Serra editore
Related URLs:
Date Deposited: 19 Jan 2017 16:43
Last Modified: 04 Sep 2021 12:03
URI: https://researchonline.ljmu.ac.uk/id/eprint/5320
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