星間分子雲において形成される星の最大質量の観測的研究

星际分子云中形成的恒星最大质量的观测研究

• 批准号: 07404008
• 负责人: FUKUI Yasuo
• 金额: $ 23.74万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07404008/
• 关键词: Radio astronomy; Star formation; Molecular cloud; 星間分子雲; 星間分子スペクトル

Studies of star formation have been made mostly as detailed ones for individual star forming regions. This kind of study tends to be done on "famous" star forming regions like Orion KL region. It is however crucially important to ask how the properties derived by such studies are ubiquitous among other regions of star formation. We need to be critical in using these results or extending the conclusions obtained to star forming regions in general. The present study aims at understanding the trend of star formation, or the general rule in star formation by carrying out an extensive survey of molecular clouds, star forming regions, with two 4-m radio telscopes equipped with the world-best superconducting receivers developed at Nagoya University.The major conclusions are summarized as follows ;1.The cloud mass spectrum is well represented as a power law of an index of 1.7.2.There is no significant correlation between the cloud mass and the spectral linewidth.3.The protostars formed in the individual clouds obeys a power law of luminosity with an index of-1,3, as is consistent with previously known Initial Mass Functions of ordinary stars.4.The maximum stellar luminosity formed in a cloud of a given mass is proportional to the 1,4-th power of the parent cloud mass.4.Star formation activity is correlated with the ratio of virial mass and LTE mass of a cloud. This trend is naturally understood as indicating that a cloud slowly contracts to for stars through dissipation of the internal turbulent motion.

对恒星形成的研究大多是针对单个恒星形成区域进行的详细研究。此类研究往往在“著名”的恒星形成区域（如猎户座吉隆坡区域）进行。然而，至关重要的是要问这些研究得出的特性如何在恒星形成的其他区域中普遍存在。我们需要谨慎地使用这些结果或将获得的结论扩展到一般的恒星形成区域。本研究旨在通过两台配备了世界上最好的超导接收器的4米射电望远镜，对分子云、恒星形成区域进行广泛的调查，以了解恒星形成的趋势，或者说恒星形成的一般规律。名古屋大学。主要结论如下：1.云质量谱很好地表示为指数为1.7.2的幂律。云质量与谱线宽度之间不存在显着相关性。3.原恒星在各个云中形成的恒星遵循指数为-1,3的光度幂律，这与先前已知的普通恒星的初始质量函数一致。4.在给定质量的云中形成的最大恒星光度与母云质量的 1,4 次方。4.恒星形成活动与云的维里质量和 LTE 质量之比相关。这种趋势自然被理解为表明云通过内部湍流运动的消散而慢慢收缩为恒星。

项目成果

T.Handa et al.: ""Detection of a Cricumstellar Gas around DMTau ; A Protoplancetary Disk around a Single Star"" Astrophys.J.449. 894-899 (1995)

T.Handa 等人：“检测到 DMTau 周围的 Cricumstellar 气体；

K.Dobashi: ""Molecular clouds in Cignus. II. Statistical studies of star forming regions"" Astrophys. J. 466. 282-295 (1996)

K.Dobashi：“西格努斯的分子云。

T.Nagahama: ""A Spatially Complete ^<13>COJ=1-0 Survey of the Orion A Cloud"" Astrophys.J. (submitted). (1997)

T.Nagahama：““猎户座 A 云的空间完整 ^<13>COJ=1-0 勘测”” Astrophys.J。

K.Dobashi et al.: ""Molecular Clouds in Cygnus. II.Statistical Studies of Star Forming Regions"" Astrophys.J.466. 282-295 (1996)

K.Dobashi 等人：“天鹅座中的分子云。

R.J.Laureijs: "“Moderate density regions in the Lynds 134 cloud complex"" Astrophys.J.Suppl.101. 87-115 (1995)

R.J.Laureijs：“Lynds 134 云复合体中的中等密度区域””Astrophys.J.Suppl.101 (1995)。