SIMBAD references

2009ApJ...707.1080A - Astrophys. J., 707, 1080-1097 (2009/December-3)

Optical spectroscopy of 20 Be/X-ray binaries in the Small Magellanic Cloud.


Abstract (from CDS):

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 Hα line that holds for Be-XRBs. SMC Be stars have larger Hα equivalent widths when compared to Be-XRBs, supporting the notion of circumstellar disk truncation by the compact object.

Abstract Copyright:

Journal keyword(s): galaxies: individual: Galaxy - Magellanic Clouds - stars: emission-line, Be - X-rays: binaries

Simbad objects: 30

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