An Escaping Young Star in the Lupus 3 Molecular Cloud

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黃紹恩(Shao-En Huang) 查詢紙本館藏

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天文研究所

論文名稱

(An Escaping Young Star in the Lupus 3 Molecular Cloud)

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摘要(中)

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。

摘要(英)

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.

關鍵字(中)

★ 年輕恆星體
★ 豺狼座三號星雲
★ 逃逸成員

關鍵字(英)

★ Young Stellar Object
★ Lupus Molecular Cloud 3
★ Escaping Member

論文目次

摘要 i
Abstract ii
Acknowledgments iii
Contents iv
List of Figures v
List of Tables vii
1 Introduction 1
1.1 Starformation 1
1.2 The Lupus molecular cloud 4
2 Data and Analysis 8
2.1 Archive catalogues 8
2.2 Data Analysis 11
3 Results and discussions 26
3.1 The Escaping Young Star 27
3.2 Discussions 32
Bibliography 37
A Know young stars not included in our candidate list 42

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指導教授

陳文屏(Wen-Ping Chen)

審核日期

2022-7-25

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