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arXiv 1003.0758astro-ph.GA
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用恒星模型测定RAVE星的距离

Distance determination for RAVE stars using stellar models

M. A. Breddels, M. C. Smith, A. Helmi, O. Bienayme, J. Binney, J. Bland-Hawthorn, C. Boeche, B. C. M. Burnett, R. Campbell, K. C. Freeman, B. Gibson, G. Gilmore… 展开作者

M. A. Breddels, M. C. Smith, A. Helmi, O. Bienayme, J. Binney, J. Bland-Hawthorn, C. Boeche, B. C. M. Burnett, R. Campbell, K. C. Freeman, B. Gibson, G. Gilmore, E. K. Grebel, U. Munari, J. F. Navarro, Q. A. Parker, G. M. Seabroke, A. Siebert, A. Siviero, M. Steinmetz, F. G. Watson, M. Williams, R. F. G. Wyse, T. Zwitter

摘要:

目的:我们开发了一种方法,用于从光谱数据中导出距离,并获得RAVE调查第二次数据发布的完整6D相空间坐标。研究方法:我们使用恒星模型结合大气属性从RAVE(Teff,logg和[Fe/H])和(J-Ks)测光档案来源,以获得绝对星等。我们能够推导出完整的6D相空间坐标的大样本的RAVE星。用人工观测数据、依巴谷三角函数和疏散星团M67的观测数据对该方法进行了检验。结果如下:当我们将我们的方法应用于一组16146颗恒星时,我们发现25%(4037)的恒星的相对(统计)距离误差<35%,而50%(8073)和75%(12110)的相对(统计)误差分别小于45%和50%。我们的各种测试表明,我们可以可靠地估计主序星的距离,但也有迹象表明,巨星的潜在系统问题。对于主序星样本(定义为log(g)> 4的样本),25%(1744颗)的相对距离误差<31%,而50%(3488颗)和75%(5231颗)的相对误差分别小于36%和42%。我们的完整数据集显示了恒星金属丰度的预期下降,作为与银河系平面距离的函数。在我们的数据集中,附近矮星的U和V速度分量中的已知运动学子结构是明显的,证实了我们数据的准确性和我们技术的可靠性。我们提供独立的测量的紫外线速度椭球和太阳运动的方向,他们是非常好的协议与以前的工作。结论:RAVE第二次数据发布的距离目录可在http://www.astro.rug.nl/~rave上获得

英文摘要:

(Abridged) Aims:We develop a method for deriving distances from spectroscopic data and obtaining full 6D phase-space coordinates for the RAVE survey's second data release. Methods: We used stellar models combined with atmospheric properties from RAVE (Teff, logg and [Fe/H]) and (J-Ks) photometry from archival sources to derive absolute magnitudes. We are able to derive the full 6D phase-space coordinates for a large sample of RAVE stars. This method is tested with artificial data, Hipparcos trigonometric parallaxes and observations of the open cluster M67. Results: When we applied our method to a set of 16 146 stars, we found that 25% (4 037) of the stars have relative (statistical) distance errors of < 35%, while 50% (8 073) and 75% (12 110) have relative (statistical) errors smaller than 45% and 50%, respectively. Our various tests show that we can reliably estimate distances for main-sequence stars, but there is an indication of potential systematic problems with giant stars. For the main-sequence star sample (defined as those with log(g) > 4), 25% (1 744) have relative distance errors < 31%, while 50% (3 488) and 75% (5 231) have relative errors smaller than 36% and 42%, respectively. Our full dataset shows the expected decrease in the metallicity of stars as a function of distance from the Galactic plane. The known kinematic substructures in the U and V velocity components of nearby dwarf stars are apparent in our dataset, confirming the accuracy of our data and the reliability of our technique. We provide independent measurements of the orientation of the UV velocity ellipsoid and of the solar motion, and they are in very good agreement with previous work. Conclusions: The distance catalogue for the RAVE second data release is available at http://www.astro.rug.nl/~rave

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