THE RADIAL VELOCITY EXPERIMENT (RAVE): SECOND DATA RELEASE-猫眼课题宝

DOI：

10.1088/0004-6256/136/1/421

发表时间：

2008-06

期刊：

The Astronomical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

T. Zwitter;A. Siebert;U. Munari;K. Freeman;A. Siviero;F. Watson;J. Fulbright;R. Wyse;R. Campbell;G. Seabroke;M. Williams;M. Steinmetz;O. Bienaymé;G. Gilmore;E. Grebel;A. Helmi;J. Navarro;B. Anguiano;C. Boeche;D. Burton;P. Cass;J. Dawe;K. Fiegert;M. Hartley;K. Russell;L. Veltz;J. Bailin;J. Binney;J. Bland-Hawthorn;A. Brown;W. Dehnen;N. Evans;P. Fiorentin;M. Fiorucci;O. Gerhard;B. Gibson;A. Kelz;K. Kujken;G. Matijevič;I. Minchev;Q. Parker;J. Peñarrubia;A. Quillen;M. Read;W. Reid;S. Roeser;G. Ruchti;R. Scholz;M. Smith;R. Sordo;E. Tolstoi;L. Tomasella;S. Vidrih;E. W. Boer

我们提出的径向速度实验（RAVE），一个雄心勃勃的光谱调查，以测量径向速度和恒星大气参数（温度，金属丰度，表面重力和旋转速度）的多达100万颗恒星使用6 dF的多目标光谱仪上的1.2米英国施密特望远镜的英澳天文台（AAO）的第二次数据发布。RAVE计划开始于2003年，从Tycho-2和SuperCOSMOS星表中获得南半球恒星Ca三重态区域（8410-8795 <$）的中等分辨率光谱（中值R = 7500），星等范围为9 < I < 12。在第一次数据发布后，目前发布的径向速度样本增加了一倍，现在包含了2003年4月11日至2005年3月31日期间141个夜晚观测到的49，327颗恒星的51，829个径向速度。与外部数据集的比较表明，自2004年4月3日以来收集的新数据显示标准差为1.3 km s-1，大约是第一次数据发布的两倍。这是第一次，该数据发布包含来自21，121颗恒星的22，407个光谱的恒星参数值。它们是通过惩罚χ2方法，使用从最新版本的库鲁茨恒星大气模型计算的广泛的合成光谱网格得到的。通过与外部数据集的比较，我们对平均信噪比（S/N）为1.40的光谱的恒星参数误差的保守估计是温度为400 K，重力为0.5 dex，金属丰度为0.2 dex。然而，我们注意到，对于所有三个恒星参数，从855颗恒星的重复RAVE观测估计的内部误差至少小了2倍。我们证明，结果显示没有系统的偏移，如果来自光度或补充光谱分析的值相比。数据发布包括Starnet 2，Tycho-2和UCAC 2目录的自行和Tycho-2 USNO-B，DENIS和2 MASS的光度测量。可通过RAVE网站http://www.rave-survey.org和CDS访问数据发布。

We present the second data release of the Radial Velocity Experiment (RAVE), an ambitious spectroscopic survey to measure radial velocities and stellar atmosphere parameters (temperature, metallicity, surface gravity, and rotational velocity) of up to one million stars using the 6 dF multi-object spectrograph on the 1.2 m UK Schmidt Telescope of the Anglo-Australian Observatory (AAO). The RAVE program started in 2003, obtaining medium resolution spectra (median R = 7500) in the Ca-triplet region (8410–8795 Å) for southern hemisphere stars drawn from the Tycho-2 and SuperCOSMOS catalogues, in the magnitude range 9 < I < 12. Following the first data release, the current release doubles the sample of published radial velocities, now containing 51,829 radial velocities for 49,327 individual stars observed on 141 nights between 2003 April 11 and 2005 March 31. Comparison with external data sets shows that the new data collected since 2004 April 3 show a standard deviation of 1.3 km s−1, about twice as good as for the first data release. For the first time, this data release contains values of stellar parameters from 22,407 spectra of 21,121 individual stars. They were derived by a penalized χ2 method using an extensive grid of synthetic spectra calculated from the latest version of Kurucz stellar atmosphere models. From comparison with external data sets, our conservative estimates of errors of the stellar parameters for a spectrum with an average signal-to-noise ratio (S/N) of ∼40 are 400 K in temperature, 0.5 dex in gravity, and 0.2 dex in metallicity. We note however that, for all three stellar parameters, the internal errors estimated from repeat RAVE observations of 855 stars are at least a factor 2 smaller. We demonstrate that the results show no systematic offsets if compared to values derived from photometry or complementary spectroscopic analyses. The data release includes proper motions from Starnet2, Tycho-2, and UCAC2 catalogs and photometric measurements from Tycho-2 USNO-B, DENIS, and 2MASS. The data release can be accessed via the RAVE Web site: http://www.rave-survey.org and through CDS.

THE RADIAL VELOCITY EXPERIMENT (RAVE): SECOND DATA RELEASE

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