Long baseline interferometry: a promising tool for multiplicity investigations of massive stars
M. De Becker
备注:
1 page, to appear in the proceedings of the ESO conference "The Interferometric View on Hot Stars", held in Vina del Mar, Chile (2-6 March 2009), RevMexAA
Massive binaries are crucial laboratories that allow us to investigate processes occurring in quite extreme conditions, such as particle acceleration, high-energy emission, or even dust formation. All these processes are intimately dependent on binarity. Our understanding of the underlying physics strongly requires preliminary multiplicity studies likely to uncover still undetected binaries, and determine their orbital parameters. However, classical spectroscopic approaches sometimes fail to provide a solution to this issue. Long baseline interferometry turns out to be a promising complementary technique to address the question of the multiplicity of massive stars. A campaign has been initiated with the VLTI to take benefit of this technique.
The multiplicity of massive stars in the Orion Nebula cluster as seen with long-baseline interferometry
多恒星系统的表征是检验当前恒星形成模型的一个重要组成部分。恒星在多个星系中发现的频率越高,它们的质量越大。因此,完整地了解高质量恒星在整个轨道分离范围内的多样性对于理解它们仍然存在争议的形成过程至关重要。对猎户座星云团的观测有助于回答有关多恒星起源和演化的问题。早期的研究提供了一个很好的知识,在非常小的(光谱)和大的分离(AO,斑点)的恒星的多样性,从而使ONC这样一个项目的一个很好的目标。我们使用VLTI的近红外干涉仪AMBER观察ONC中的亮星样本。我们通过NACO对θ1 Ori A的观测档案来补充我们的数据集,以获得有关近距离可见伴星轨道的更多信息。我们的观测分辨了已知的多重系统θ1 Ori C和θ1 Ori A,并提供了新的轨道点,证实了θ1 Ori C的轨道预测和恒星参数测定。结合AMBER和NACO关于θ1 Ori A的数据,我们能够跟踪2003年至2011年的伴星运动。此外,我们还发现了θ1猎户座D周围的伴星和NU猎户座之前未知的伴星的线索。在约90%的概率下,我们可以排除在我们的样本恒星周围质量> 3 Msun的伴星,其分离度在约2质量和约110质量之间。我们的结论是,θ1 Ori A周围的伴星很可能与主星有物理上的联系。新发现的可能的同伴进一步增加了ONC的多样性。对于我们的两个O型和三个B型恒星的样本,我们发现每个主星平均有2.5个已知的伴星,这是低质量恒星的五…
Stellar Multiplicity via Speckle Interferometry with the 3.6 m Devasthal Optical Telescope
Aryabhatta Research Institute of Observational Sciences(阿亚帕塔观测科学研究所);School of Applied Sciences, Centurion University of Technology and Management(中央技术与管理大学应用科学学院);Inter-University Centre for Astronomy and Astrophysics(大学间天文学与天体物理学中心);Physik-Institut, University of Zurich(苏黎世大学物理学院)
Multiplicity of Galactic Cepheids from long-baseline interferometry~III. Sub-percent limits on the relative brightness of a close companion of $δ$~Cephei
European Southern Observatory(欧洲南方天文台);Institute of Astronomy, KU Leuven(鲁汶大学天体物理研究所);Leuven Gravity Institute, KU Leuven(鲁汶大学引力研究所);Univ. Grenoble Alpes, CNRS, IPAG(格勒诺布尔阿尔卑斯大学,法国国家科学研究中心,IPAG);Physics Department, Technion - Israel institute of Technology(以色列理工学院物理系);Anton Pannekoek Institute, University of Amsterdam(阿姆斯特丹大学安东·潘内科克研究所);School of Mathematics, Statistics and Physics, Newcastle University(纽卡斯尔大学数学、统计与物理学院);Royal Observatory of Belgium(比利时皇家天文台);ESO Headquarters(欧洲南方天文台总部);German Aerospace Center (DLR)(德国航空航天中心)