The 155-day X-ray cycle of the very massive Wolf-Rayet star Melnick 34 in the Large Magellanic Cloud

被引：17
作者：
Pollock, A. M. T. [1 ]
Crowther, P. A. [1 ]
Tehrani, K. [1 ]
Broos, Patrick S. [2 ]
Townsley, Leisa K. [2 ]
机构：
[1] Univ Sheffield, Dept Phys & Astron, Hounsfield Rd, Sheffield S3 7RH, S Yorkshire, England
[2] Penn State Univ, Dept Astron & Astrophys, Davey Lab 525, University Pk, PA 16802 USA
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 474卷 / 03期
关键词：
shock waves; binaries: eclipsing; stars: massive; stars:; winds; outflows; stars: Wolf-Rayet; X-rays: stars; ETA-CARINAE; COLLIDING WINDS; CHANDRA-ACIS; 30; DORADUS; WR; 48A; BINARY; VARIABILITY; R136; I; PERIASTRON;
D O I：
10.1093/mnras/stx2879
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The Wolf-Rayet star Mk 34 was observed more than 50 times as part of the deep T-ReX Chandra ACIS-I X-ray imaging survey of the Tarantula Nebula in the Large Magellanic Cloud conducted between 2014 May and 2016 January. Its brightness showed one bright maximum and repeated faint minima which help define an X-ray recurrence time of 155.1 +/- 0.1 d that is probably the orbital period of an eccentric binary system. The maximum immediately precedes the minimum in the folded X-ray light curve as confirmed by new Swift XRT observations. Notwithstanding its extreme median luminosity of 1.2 x 10(35) erg s(-1), which makes it over an order of magnitude brighter than comparable stars in the Milky Way, Mk 34 is almost certainly a colliding-wind binary system. Its spectrum shows phase-related changes of luminosity and absorption that are probably related to the orbital dynamics of two of the most massive stars known.
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收藏
页码：3228 / 3236
页数：9
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