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The Gaia-ESO Survey: pre-main-sequence stars in the young open cluster NGC 3293

Delgado, AJ and Sampedro, L and Alfaro, EJ and Costado, MT and Yun, JL and Frasca, A and Lanzafame, AC and Drew, JE and Eisloeffel, J and Blomme, R and Morel, T and Lobel, A and Semaan, T and Randich, S and Jeffries, RD and Micela, G and Vallenari, A and Kalari, V and Gilmore, G and Flaccomio, E and Carraro, G and Lardo, C and Monaco, L and Prisinzano, L and Sousa, SG and Morbidelli, L and Lewis, J and Koposov, S and Hourihane, A and Worley, C and Casey, A and Franciosini, E and Sacco, G and Magrini, L (2016) The Gaia-ESO Survey: pre-main-sequence stars in the young open cluster NGC 3293. Monthly Notices of the Royal Astronomical Society, 460 (3). ISSN 0035-8711

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Abstract

The young open cluster NGC3293 is included in the observing program of the Gaia-ESO survey (GES). The radial velocity values provided have been used to assign cluster membership probabilities by means of a single-variable parametric analysis. These membership probabilities are compared to the results of the photometric membership assignment of NGC3293, based on UBVRI photometry. The agreement of the photometric and kinematic member samples amounts to 65 per cent, and could increase to 70 per cent as suggested by the analysis of the differences between both samples. A number of photometric PMS candidate members of spectral type F are found, which are confirmed by the results from VPHAS photometry and SED fitting for the stars in common with VPHAS and GES data sets. Excesses at mid- and near-infrared wavelengths, and signs of Hα emission, are investigated for them. Marginal presence of Hα emission or infilling is detected for the candidate members. Several of them exhibit moderate signs of U excess and weak excesses at mid-IR wavelengths. We suggest that these features originate from accretion discs in their last stages of evolution.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 22 Nov 2016 12:11
Last Modified: 22 Nov 2016 12:11
DOI or Identification number: 10.1093/mnras/stw1217
URI: http://researchonline.ljmu.ac.uk/id/eprint/4837

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