An Escaping Young Star in the Lupus 3 Molecular Cloud

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/89185

Title:	An Escaping Young Star in the Lupus 3 Molecular Cloud
Authors:	黃紹恩;Huang, Shao-En
Contributors:	天文研究所
Keywords:	年輕恆星體;豺狼座三號星雲;逃逸成員;Young Stellar Object;Lupus Molecular Cloud 3;Escaping Member
Date:	2022-07-25
Issue Date:	2022-10-04 11:00:38 (UTC+8)
Publisher:	國立中央大學
Abstract:	距離約160秒差距的豺狼座分子雲是離太陽最近的恆星形成區之一。在九個已知的雲氣中，四個正在進行恆星形成，其中又以三號分子雲為最活躍的恆星形成區域。我們利用近紅外2MASS和中遠紅外ALLWISE的顏色，以指認從深埋的原恆星到被行星盤環繞的典型金牛座T型星的年輕恆星。此區域的成員曾經過詳細研究，因此我們辨識出的兩顆第一類型年輕恆星(原恆星)以及42顆第二類型年輕恆星(典型金牛座T型)星，的確已經存在文獻中，但有一顆例外。這顆星(WISEA J160441.81−391315.4)具有明顯紅外超量，且為氫發射星，同時 Gaia EDR3的自行運動、視差皆與其他年輕成員一致，證明這顆星屬於年輕的成員。這顆星離13CO觀測描繪的分子雲(也就是年輕星團所在)大約 1 度，以運動來推測，大約在100萬到200萬年前從星團中以目前未知的機制逃逸出來。;The Lupus molecular cloud complex, at a distance of about 160 pc, is one of the nearest star-forming regions. Of the nine identified clouds, four are known to have ongoing star formation, with the Lupus 3 cloud being the most active. We present here identification of the young stellar objects from embedded proto-stars to planetary disk-bearing classical T Tauri stars in Lupus 3, selected by using near-infrared 2MASS, and mid- to far-infrared ALLWISE colors. The young stellar population in Lupus 3 has been well censored; of the two Class I (proto-stars) and 42 Class II objects (classical T Tauri stars) that we found, indeed all are known in the literature, except one, WISEA J160441.81−391315.4, not recognized previously. This object has distinct infrared excess, is an H-alpha emitter, and shares the same Gaia EDR3 proper motion and parallax as other young members, indicative of young membership. The star is located some 1 deg from the dense molecular core, traced by the 13CO observations, with which other young stellar objects are crowded. The kinematics suggest the star might have been a runaway member 1–2 Myr ago from the cluster, though at the moment no definite mechanism is inferred.
Appears in Collections:	[Graduate Institute of Astronomy] Electronic Thesis & Dissertation

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