A Catalog of Early-type Hα Emission-line Stars and 62 Newly Confirmed Herbig Ae/Be Stars from LAMOST Data Release 7
A Catalog of Early-type Hα Emission-line Stars and 62 Newly Confirmed Herbig Ae/Be Stars from LAMOST Data Release 7
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DOI：
10.3847/1538-4365/ac4964
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发表时间：
2022-04-01
影响因子：
8.7
通讯作者：
Zhao, Yong-Heng
中科院分区：
文献类型：
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作者：
Zhang, Yun-Jin;Hou, Wen;Zhao, Yong-Heng
我们从LAMOST数据发布7中得到了一个包含25,867颗恒星的30,023个光谱的早期类型发射线星表，其中有4189个恒星有辛巴德记录。根据Hα发射线分布，将光谱分为三种形态类型(10个亚型)。一些被星云发射线污染的光谱，例如来自H II区的光谱，被标记在星表中。我们还根据P-天鹅座或逆P-天鹅座的轮廓，通过计算恒星的末端速度和峰值速度，提供了20颗有恒星风或吸积流的恒星的特殊星表。更重要的是，通过已知的HerBig Ae/Be星(HAeBes)和经典Ae/Be星(CAeBes)的两个色彩图(H-K-S，J-H)和(K-S-W1，H-K-S)，我们提出了一个更新的区分HAeBe和CAeBe的判据。根据该标准，我们从样本中选择了118个HAeBe候选者和2636个CAeBe候选者。我们根据LAMOST(光谱)和WISE(光度和图像)的数据确认了118个HAeBe中的71个，其中62个是新鉴定的。已确定的71个HAeBe被汇编到一个特定的目录中，它们的SED和MIR图像也被提供。76%确认的HAeBe的距离大于1kpc，这在更远的距离上增加了已知HAeBe的数量。在71颗HAeBe中，大部分位于银河盘中，其中6颗拥有Divide Z(GAL)Divide>；400PC。其中J051425.20+411310.7是新发现的B[e]。此外，4个具有Spitzer红外光谱的HAeBe均具有多环芳烃特征。
We derive a catalog of early-type emission-line stars including 30,023 spectra of 25,867 stars from LAMOST Data Release 7, in which 4189 have Simbad records. The spectra are classified into three morphological types (10 subtypes) based on H alpha emission-line profiles. Some spectra contaminated by nebula emission lines such as from H ii regions are flagged in the catalog. We also provide a specific catalog of 20 stars with stellar winds or accretion flows by calculating the terminal and peak velocities based on P-Cygni or inverse P-Cygni profiles. More important, with two color-color diagrams, (H-K-s, J-H) and (K-s-W1, H-K-s), of a collection of known Herbig Ae/Be stars (HAeBes) and classical Ae/Be stars (CAeBes), we propose an updated criterion to separate HAeBes from CAeBes. By the criterion, we select 118 HAeBe candidates and 2636 CAeBe candidates from the sample. We confirm 71 of the 118 HAeBes based on the data from LAMOST (optical spectra) and WISE (photometry and images), 62 of which are newly identified. The 71 identified HAeBes are compiled into a specific catalog, and their SEDs and MIR images are also presented. The distances of 76% confirmed HAeBes are further than 1 kpc, which enlarges the number of known HAeBes in further distance. Most of the 71 HAeBes are located in the Galactic disk while 6 of them have divide Z (gal) divide > 400 pc. Four HAeBes show the forbidden emission lines of [Fe ii] and [O i], in which J051425.20+411310.7 is a newly discovered B[e]. In addition, four HAeBes having Spitzer IRS spectra all show PAH features.