The peculiar X-ray source in NGC 5281 |
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Authors: | A Marco I Negueruela M Ribó J Lorenzo C Motch |
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Institution: | 1. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, Escuela Politécnica Superior, Universidad de Alicante, Apdo.99, E-03080 Alicante, Spain;2. Departament d’Astronomia i Meteorologia and Institut de Ciències del Cosmos (ICC), Universitat de Barcelona (UB/IEEC), Mart?´ i Franquès 1, 08028 Barcelona, Spain;3. Observatoire Astronomique, UMR 7550 CNRS, 11 rue de l’Université, F-67000 Strasbourg, France |
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Abstract: | Recent observations with Chandra and XMM-Newton have shown that the X-ray source 1WGA J1346.5–6255 is associated with the Be star HD 119682, a member of the open cluster NGC 5281, and displays all the characteristics of the new class of X-ray sources known as γ-Cas analogues. We present a detailed spectroscopic study of this open cluster, finding an age of 40 Myr and a sequence of evolved stars. These results imply that HD 119682 is a blue straggler in NGC 5281, as it is much more massive than any other cluster member, and its membership is strongly suggested by proper motion analysis. This is the second γ-Cas analogue found to be blue straggler in an open cluster, suggesting that evolution plays a role in the formation of these systems and that a supernova explosion has not occurred in them. |
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Keywords: | Open clusters and associations: individual (NGC 5281) Stars: individual (HD 119682) Stars: emission-line Be |
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