Fundamental parameters and infrared excesses of Tycho–Gaia stars
Fundamental parameters and infrared excesses of Tycho–Gaia stars
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DOI：
10.1093/mnras/stx1433
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发表时间：
2017-06
影响因子：
4.8
通讯作者：
I. McDonald;A. Zijlstra;R. Watson
中科院分区：
文献类型：
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作者：
I. McDonald;A. Zijlstra;R. Watson
计算了1,475,921颗Tycho-2和107,145颗Hipparcos恒星的有效温度和光度，基于与Gaia数据发布版1的距离。参数是通过比较多波长档案测光和BT-SETTL模型大气得出的。Tycho-2和Hipparcos恒星的1-sigma不确定度是温度的+/-137K和+/-125K，光度的+/-35%和+/-19%。光度的不确定度由盖亚视差的不确定度决定。在4256颗恒星中发现了4.6微米至25微米红外超额的证据，其中1883颗恒星是强有力的候选者。这些恒星包括渐近巨星分支(AGB)恒星、造父变星、赫比Ae/Be恒星、年轻天体和其他来源。我们通过探索星际局部灭绝、AGB恒星产生尘埃的开始、太阳附近的年龄和金属丰度梯度以及古尔德带内的结构，简要地展示了这个数据集的能力。最后，我们将讨论未来GAIA数据发布的潜在影响。
Effective temperatures and luminosities are calculated for 1,475,921 Tycho-2 and 107,145 Hipparcos stars, based on distances from Gaia Data Release 1. Parameters are derived by comparing multi-wavelength archival photometry to BT-Settl model atmospheres. The 1-sigma uncertainties for the Tycho-2 and Hipparcos stars are +/-137 K and +/-125 K in temperature and +/-35 per cent and +/-19 per cent in luminosity. The luminosity uncertainty is dominated by that of the Gaia parallax. Evidence for infrared excess between 4.6 and 25 microns is found for 4256 stars, of which 1883 are strong candidates. These include asymptotic giant branch (AGB) stars, Cepheids, Herbig Ae/Be stars, young stellar objects, and other sources. We briefly demonstrate the capabilities of this dataset by exploring local interstellar extinction, the onset of dust production in AGB stars, the age and metallicity gradients of the solar neighbourhood and structure within the Gould Belt. We close by discussing the potential impact of future Gaia data releases.