OPTICAL SPECTROSCOPY OF 20 Be/X-RAY BINARIES IN THE SMALL MAGELLANIC CLOUD

被引：32

作者：

Antoniou, V. ^{[1
,2
]}

Hatzidimitriou, D. ^{[1
]}

Zezas, A. ^{[1
,2
,3
]}

Reig, P. ^{[1
,3
]}

机构：

[1] Univ Crete, Dept Phys, GR-71003 Iraklion, Crete, Greece

[2] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[3] Fdn Res & Technol Hellas, IESL, Iraklion 71110, Crete, Greece

来源：

ASTROPHYSICAL JOURNAL | 2009年 / 707卷 / 02期

关键词：

galaxies: individual (Galaxy); Magellanic Clouds; stars:; emission-line; Be; X-rays: binaries; STAR-FORMATION CONDITIONS; XMM-NEWTON OBSERVATIONS; EMISSION-LINE PROFILES; VLT-FLAMES; CIRCUMSTELLAR DISKS; EQUIVALENT WIDTHS; SPECTRAL TYPES; B-STARS; SMC; METALLICITY;

D O I：

10.1088/0004-637X/707/2/1080

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a large sample (20 in total) of optical spectra of Small Magellanic Cloud (SMC) High-Mass X-ray Binaries obtained with the 2dF spectrograph at the Anglo-Australian Telescope. All of these sources are found to be Be/X-ray binaries (Be-XRBs), while for five sources we present original classifications. Several statistical tests on this expanded sample support previous findings for similar spectral-type distributions of Be-XRBs and Be field stars in the SMC, and of Be-XRBs in the Large Magellanic Cloud and the Milky Way, although this could be the result of small samples. On the other hand, we find that Be-XRBs follow a different distribution than Be stars in the Galaxy, also in agreement with previous studies. In addition, we find similar Be spectral-type distributions between the Magellanic Clouds samples. These results reinforce the relation between the orbital period and the equivalent width of the Ha line that holds for Be-XRBs. SMC Be stars have larger Ha equivalent widths when compared to Be-XRBs, supporting the notion of circumstellar disk truncation by the compact object.

引用

页码：1080 / 1097

页数：18

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