Herbig Ae/Be Stars in the Magellanic Bridge
Herbig Ae/Be Stars in the Magellanic Bridge
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DOI：
10.1086/511326
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发表时间：
2007-02
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通讯作者：
S. Nishiyama;Y. Haba;D. Kato;D. Baba;H. Hatano;M. Tamura;Y. Nakajima;A. Ishihara;T. Nagata;K. Sugitani;N. Matsunaga;H. Fukushi;N. Kusakabe;S. Sato
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作者：
S. Nishiyama;Y. Haba;D. Kato;D. Baba;H. Hatano;M. Tamura;Y. Nakajima;A. Ishihara;T. Nagata;K. Sugitani;N. Matsunaga;H. Fukushi;N. Kusakabe;S. Sato
我们在麦哲伦大桥的西部地区发现了赫比格·埃/贝的明星候选人。利用天狼星近红外相机和1.4m望远镜，在J、H和Ks波段进行了~3.0°×1.3°(2 4°≲α≲36°，-75.0°≲δ≲-73.7°)的测量。在颜色和星等的基础上，选出了大约200个HerBig Ae/Be恒星候选者。考虑到其他来源的污染，如麦哲伦桥上的前景星和早型矮星，我们估计大约80(≈40%)的候选恒星可能是赫比格Ae/Be恒星。我们还在年轻的星团NGC796上发现了一个候选恒星的集中点，这有力地表明麦哲伦桥中存在前主序(PMS)恒星。这是麦哲伦桥首次探测到经前综合征候选恒星，如果它们是真正的经前综合征恒星，这可能是最近恒星形成的直接证据。然而，赫比格Ae/Be星数量的估计依赖于经典Be星的比例，因此需要更精确地确定Be星比例或观测来区分赫比格Ae/Be星和经典Be星。
We have found Herbig Ae/Be star candidates in the western region of the Magellanic Bridge. Using the near-infrared camera SIRIUS and the 1.4 m telescope IRSF, we surveyed ~3.0° × 1.3° (24° ≲ α ≲ 36°, -75.0° ≲ δ ≲ -73.7°) in the J, H, and Ks bands. On the basis of colors and magnitudes, about 200 Herbig Ae/Be star candidates are selected. Considering the contaminations by miscellaneous sources, such as foreground stars and early-type dwarfs in the Magellanic Bridge, we estimate that about 80 (≈40%) of the candidates are likely to be Herbig Ae/Be stars. We also found one concentration of the candidates at the young star cluster NGC 796, strongly suggesting the existence of pre-main-sequence (PMS) stars in the Magellanic Bridge. This is the first detection of PMS star candidates in the Magellanic Bridge, and if they are genuine PMS stars, this could be direct evidence of recent star formation. However, the estimate of the number of Herbig Ae/Be stars depends on the fraction of classical Be stars, and thus a more precise determination of the Be star fraction or observations to differentiate between the Herbig Ae/Be stars and classical Be stars are required.