Wolf-Rayet Stars in the Galatic center: modeling and analyzing infrared spectra

银河中心的沃尔夫拉叶星：红外光谱建模和分析

• 批准号: 21215198
• 负责人: Professor Dr. Wolf-Rainer Hamann
• 金额: --
• 依托单位: Institut für Physik und Astronomie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/21215198?language=en
• 关键词: Wolf; Rayet; Stars; Galatic; center

Presently the infrared spectral range enjoys an unprecedented importance, promoted by recent and upcoming observing instruments. Ground-based telescopes, especially in connection with adaptive optics and integral-field spectroscopy, combine highest spatial resolution with high efficiency in the near infrared, while space-based instruments give access to wider wavelength ranges. Of paramount interest is the Galactic center, which is obscured by dust clouds and therefore only observable at infrared wavelengths. Many hot, massive stars populate this enigmatic region. However, a purely infrared-based spectral analysis of stars with strong stellar winds (especially so-called Wolf-Rayet stars) is still in its infancy. Our group developed theoretical models for this kind of stellar atmospheres and their emergent spectra. The project proposed here will open the access to the IR range in modeling and analyzing Wolf-Rayet star spectra. We will carefully synthesize the IR spectra in our numerical calculations. As the number of observable spectral lines in the IR is limited, parameter studies must reveal the significance and uniqueness of IR-restricted analyses. The methods shall be verified first by means of stars which are also accessible in the visible range. Subsequently we will analyze stars close to the Galactic center from their infrared spectra, including data which we obtained ourselves with the Spitzer infrared space observatory.

目前，红外光谱范围享有前所未有的重要性，最近和即将推出的观测仪器。地面望远镜，特别是与自适应光学和积分场光谱学有关的望远镜，将最高的空间分辨率与近红外的高效率结合在一起，而空间仪器则可以获得更宽的波长范围。最令人感兴趣的是银河系的中心，它被尘埃云遮蔽，因此只能在红外波长处观察到。许多炽热的大质量恒星居住在这个神秘的区域。然而，对具有强烈星风的恒星（特别是所谓的沃尔夫-拉叶星）的纯红外光谱分析仍处于起步阶段。我们的小组发展了这种恒星大气及其出射光谱的理论模型。该项目的提出将为Wolf-Rayet星星光谱的建模和分析开辟一条新的途径。我们将在数值计算中仔细综合红外光谱。由于红外光谱中可观测谱线的数量有限，参数研究必须揭示红外限制分析的意义和唯一性。这些方法应首先通过在可见光范围内也可接近的星星进行验证。随后，我们将从红外光谱中分析靠近银河系中心的恒星，包括我们自己从斯皮策红外空间天文台获得的数据。