Variability of Young Stellar Objects in the Perseus Molecular Cloud  

作　　者：Xiao-Long Wang Min Fang Gregory J.Herczeg Yu Gao Hai-Jun Tian Xing-Yu Zhou Hong-Xin Zhang Xue-Peng Chen 

机构地区：[1]Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China [4]Kavli Institute for Astronomy and Astrophysics,Peking University,Beijing 100871,China [5]Department of Astronomy,Peking University,Beijing 100871,China [6]Department of Astronomy,Xiamen University,Xiamen 361005,China [7]School of Science,Hangzhou Dianzi University,Hangzhou 310018,China [8]Key Laboratory for Research in Galaxies and Cosmology,Department of Astronomy,University of Science and Technology of China,Hefei 230026,China

出　　处：《Research in Astronomy and Astrophysics》2023年第7期174-196,共23页天文和天体物理学研究(英文版)

基　　金：the support of the CAS International Cooperation Program(Grant No.114332KYSB20190009);the National Natural Science Foundation of China(NSFC)Grant No.12033004;supported by grant 12173003 from the NSFC;Funding for the project has been provided by the National Development and Reform Commission;supported by the National Science Foundation under grant Nos.AST1440341 and AST-2034437。

摘　　要：We present an analysis of 288 young stellar objects(YSOs)in the Perseus molecular cloud that have well defined g and r-band lightcurves from the Zwicky Transient Facility.Of the 288 YSOs,238 sources(83%of our working sample)are identified as variables based on the normalized peak-to-peak variability metric,with variability fraction of 92%for stars with disks and 77%for the diskless populations.These variables are classified into different categories using the quasiperiodicity(Q)and flux asymmetry(M)metrics.Fifty-three variables are classified as strictly periodic objects that are well phased and can be attributed to spot modulated stellar rotation.We also identify 22 bursters and 25 dippers,which can be attributed to accretion burst and variable extinction,respectively.YSOs with disks tend to have asymmetric and non-repeatable lightcurves,while the YSOs without disks tend to have(quasi)periodic lightcurves.The periodic variables have the steepest change in g versus g-r,while bursters have much flatter changes than dippers in g versus g-r.Periodic and quasiperiodic variables display the lowest variability amplitude.Simple models suggest that the variability amplitudes of periodic variables correspond to changes of the spot coverage of 30%-40%,burster variables are attributed to accretion luminosity changes in the range of L_(acc)/L_(*)=0.1-0.3,and dippers are due to variable extinction with A_(V)changes in the range of 0.5-1.3 mag.

关 键 词：stars:variables:general stars:late-type stars:emission-line Be (stars:)starspots ACCRETION accretion disks 

分 类 号：P151[天文地球—天文学]