An X-ray investigation of the NGC 346 field in the SMC (3): XMM-Newton data

Abstract

We present new XMM-Newton results on the field around the NGC346 star cluster in the SMC. This continues and extends previously published work on Chandra observations of the same field. The two XMM-Newton observations were obtained, respectively, six months before and six months after the previously published Chandra data. Of the 51 X-ray sources detected with XMM-Newton, 29 were already detected with Chandra. Comparing the properties of these X-ray sources in each of our three datasets has enabled us to investigate their variability on times scales of a year. Changes in the flux levels and/or spectral properties were observed for 21 of these sources. In addition, we discovered long-term variations in the X-ray properties of the peculiar system HD5980, a luminous blue variable star, that is likely to be a colliding wind binary system, which displayed the largest luminosity during the first XMM-Newton observation.

arXiv comment19 pages, 5 figures (in gif), accepted by ApJ, also available from http://vela.astro.ulg.ac.be/Preprints/P89/index.html

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Cited by in corpus (14)

• The VLT-FLAMES Survey of Massive Stars: Observations centered on the Magellanic Cloud clusters NGC 330, NGC 346, NGC 2004, and the N11 region
• The XMM-Newton survey of the Small Magellanic Cloud: The X-ray point-source catalogue
• Spitzer Infrared Spectrographic point source classification in the Small Magellanic Cloud
• New XMM-Newton observations of SNRs in the SMC
• The first X-ray survey of Galactic Luminous Blue Variables
• Exploring the Small Magellanic Cloud to the Faintest X-ray Fluxes: Source Catalog, Timing and Spectral Analysis
• XMM-Newton observations of CXOU J010043.1-721134: the first deep look at the soft X-ray emission of a magnetar
• The Clustering Behavior of Pre-Main Sequence Stars in NGC 346 in the Small Magellanic Cloud
• NGC 346 in The Small Magellanic Cloud. IV. Triggered Star Formation in the HII Region N66
• Binarity at LOw Metallicity (BLOeM): a spectroscopic VLT monitoring survey of massive stars in the SMC
• First detection of phase-dependent colliding wind X-ray emission outside the Milky Way
• The Star-forming Region NGC 346 in the Small Magellanic Cloud with Hubble Space Telescope ACS Observations. II. Photometric Study of the Intermediate-Age Star Cluster BS 90
• A very young component in the pre-eminent starburst region of the Small Magellanic Cloud
• A changing wind collision