2dF-AAOmega spectroscopy of massive stars in the Magellanic Clouds: The north-eastern region of the Large Magellanic Cloud

Abstract

We present spectral classifications from optical spectroscopy of 263 massive stars in the north-eastern region of the Large Magellanic Cloud. The observed two-degree field includes the massive 30 Doradus star-forming region, the environs of SN1987A, and a number of star-forming complexes to the south of 30 Dor. These are the first classifications for the majority (203) of the stars and include eleven double-lined spectroscopic binaries. The sample also includes the first examples of early OC-type spectra (AAOmega 30 Dor 248 and 280), distinguished by the weakness of their nitrogen spectra and by C IV 4658 emission. We propose that these stars have relatively unprocessed CNO abundances compared to morphologically normal O-type stars, indicative of an earlier evolutionary phase. From analysis of observations obtained on two consecutive nights, we present radial-velocity estimates for 233 stars, finding one apparent single-lined binary and nine (>3sigma) outliers compared to the systemic velocity; the latter objects could be runaway stars or large-amplitude binary systems and further spectroscopy is required to investigate their nature.

Accepted by A&A

References in corpus (10)

• An eclipsing binary distance to the Large Magellanic Cloud accurate to 2 per cent
• The VLT-FLAMES Survey of Massive Stars: Observations centered on the Magellanic Cloud clusters NGC 330, NGC 346, NGC 2004, and the N11 region
• Spitzer SAGE Infrared Photometry of Massive Stars in the Large Magellanic Cloud
• Neglecting the porosity of hot-star winds can lead to underestimating mass-loss rates
• Spitzer SAGE-SMC Infrared Photometry of Massive Stars in the Small Magellanic Cloud
• The VLT-FLAMES Tarantula Survey XXII. Multiplicity properties of the B-type stars
• VLT/UVES Observations of Interstellar Molecules and Diffuse Bands in the Magellanic Clouds
• The VLT-FLAMES Tarantula Survey XVIII. Classifications and radial velocities of the B-type stars
• Spectroscopic study of the N159/N160 complex in the Large Magellanic Cloud
• Eclipsing binary stars in the Large Magellanic Cloud. Results from the EROS-2, OGLE and VMC surveys

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