论文标题
在低金属性III处进化的巨大恒星。大麦芽云的源目录
Evolved Massive Stars at Low-metallicity III. A Source Catalog for the Large Magellanic Cloud
论文作者
论文摘要
我们提出了一个干净的,限制的(IRAC1或WISE1 $ \ leq $ 15.0 mag)的多波长源目录,用于LMC。该目录是建立在Seip源列表和Gaia DR2之间的交叉匹配($ 1'' $)和脱键($ 3'' $)上的,对Gaia Astromentric解决方案有严格的约束,以消除前景污染。该目录在52个不同的频段中包含197,004个目标,包括2个紫外线,21个光学和29个红外带。从文献中收集了有关径向速度和光谱/光度分类的其他信息。我们样品的明亮端主要由蓝色氦燃烧的星(BHEB)和红色HEB组成,并在蓝色端处不可避免地污染主序列恒星。根据先前的研究应用了修改的大小和颜色削减后,我们在LMC中识别并列为2,974 RSG,508 YSG和4,786个BSG候选物,六个CMD中的LMC。 LMC和SMC的CMD之间的比较表明,最明显的差异出现在光学和近红外CMD的鲜红色端,其中凉爽的恒星(例如RSGS,AGB和RGS)位于可能是由于金属性和SFH的效果所致。在相等的绝对大小垃圾箱中对大型恒星候选物的颜色进行进一步的定量比较表明,BSG候选者基本上没有差异,但是由于LMC目标比SMC差异,RSG候选者的差异很大,这可能是由于SMC的差异,这可能是由于金属对光谱类型和质量 - 质量效果的综合效应以及同时的质量效应以及时代的效果。 $ t _ {\ rm eff} $的大量星人种群也来自$(j-k _ {\ rm s})_ 0 $的无红色颜色。 $ t _ {\ rm eff} $范围为$ 3500 <t _ {\ rm eff} <5000 $ k的rsg总体,$ 5000 <t _ {\ rm eff} <8000 $ k的ysg人群和$ t _ {\ rm eff}> 8000 $ k的bsg人群,以及较大的und und unceties the the in for Bs inf inf unceent conterties。
We present a clean, magnitude-limited (IRAC1 or WISE1$\leq$15.0 mag) multiwavelength source catalog for the LMC. The catalog was built upon crossmatching ($1''$) and deblending ($3''$) between the SEIP source list and Gaia DR2, with strict constraints on the Gaia astrometric solution to remove the foreground contamination. The catalog contains 197,004 targets in 52 different bands including 2 ultraviolet, 21 optical, and 29 infrared bands. Additional information about radial velocities and spectral/photometric classifications were collected from the literature. The bright end of our sample is mostly comprised of blue helium-burning stars (BHeBs) and red HeBs with inevitable contamination of main sequence stars at the blue end. After applying modified magnitude and color cuts based on previous studies, we identify and rank 2,974 RSG, 508 YSG, and 4,786 BSG candidates in the LMC in six CMDs. The comparison between the CMDs of the LMC and SMC indicates that the most distinct difference appears at the bright red end of the optical and near-infrared CMDs, where the cool evolved stars (e.g., RSGs, AGB, and RGs) are located, which is likely due to the effect of metallicity and SFH. Further quantitative comparison of colors of massive star candidates in equal absolute magnitude bins suggests that, there is basically no difference for the BSG candidates, but large discrepancy for the RSG candidates as LMC targets are redder than the SMC ones, which may be due to the combined effect of metallicity on both spectral type and mass-loss rate, and also the age effect. The $T_{\rm eff}$ of massive star populations are also derived from reddening-free color of $(J-K_{\rm S})_0$. The $T_{\rm eff}$ ranges are $3500<T_{\rm eff}<5000$ K for RSG population, $5000<T_{\rm eff}<8000$ K for YSG population, and $T_{\rm eff}>8000$ K for BSG population, with larger uncertainties towards the hotter stars.