An observational study of the evolution of low mass protostars in interstellar molecular clouds

星际分子云中低质量原恒星演化的观测研究

• 批准号: 01065002
• 负责人: FUKUI Yasuo
• 金额: $ 196.48万
• 依托单位: Faculty of Science, Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Specially Promoted Research
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01065002/
• 关键词: radio astronomy; star formation; interstellar molecules; millimeter-wave astronomy; interstellar matter

We have built the new 4m mm-wave telescope, and improved the sensitivity of the supercoducting receiver. The telescope shows a remarkably high capability in observing mm-wave radiation. The best receiver temperature achieved is as low as 20K in DSB,the best value reported so far in the literature. The main results from the research are as follows ;1.Discovery of 62 molecular outflows. This number corresponds to one third of the total discovered so far.2.Complete observations of the 13CO emission in the Orion A region, Taurus and Ophiuchus (150,000 spectra).3.Complete survey for dense cores in the above three regions in the C18O emission (15,000 spectra).4.CS survey for Orion and Ophiuchus (4,000 spectra).5.Detection of the gas disk in GG Tau, a young T Tauri.By analysing these data sets, we have obtained the basic properties of dense cores and their time scales, and also have located the molecular outflow as the main accretion phase in the protostellar evolution. These outcomes provide valuable observational constraints on star formation.

我们建造了新的4 m毫米波望远镜，并提高了超导接收机的灵敏度。该望远镜在观测毫米波辐射方面表现出非常高的能力。在DSB中，最佳接收器温度低至20 K，这是迄今为止文献中报道的最佳值。主要研究结果如下：1.发现62个分子外流。这个数字相当于迄今为止发现的总数的三分之一。2.猎户座A区、金牛座和蛇夫座13 CO发射的完整观测（15万个光谱）3.完成上述三个地区致密岩心C18 O发射的测量（15，000个光谱）.4.CS猎户座和蛇夫座巡天（4,000个光谱）5.探测到年轻的金牛座T星GG Tau的气体盘。通过分析这些数据集，我们获得了致密核的基本性质及其时间尺度，并将分子外流定位为原恒星演化的主要吸积阶段。这些结果为星星的形成提供了有价值的观测约束。

项目成果

M.Skrutskie: "Detection of a gaseous circumstellar disk associated with GG Tau." Astrohphys.J.409. 422-428 (1993)

M.Skrutskie：“检测到与 GG Tau 相关的气态星周盘。”

Y.Uchida: "Velocity split along the Rho Ophiuchi streamer (north): spinning streamer as "angular momentum drain" from massive cloud of actie star-formation." P.A.S.Japan. 42. 69-83 (1990)

Y.Uchida：“沿着蛇夫座 Rho 流带（北）的速度分裂：旋转的流带作为来自大量活跃恒星形成云的“角动量消耗”。”

T.Umemoto: "U-shaped outflow in the L1221 dark cloud: an example of interaction of outflows with ambient clouds." Astrophys.J.377. 510-518 (1991)

T.Umemoto：“L1221 暗云中的 U 形流出：流出与周围云相互作用的一个例子。”

T.Umemoto: "The outflow in the L1157 dark cloud: evidence for shock heating of the ambient gas." Astrophys.J. (Letters). 392. L83-L86 (1992)

T.Umemoto：“L1157 暗云中的流出：环境气体骤变加热的证据。”

K.Dobashi: "^<12>CO and ^<13>CO observations of the dark cloud complex near IC5146." Astron.J.104. :1525-1532 (1992)

K.Dobashi：“IC5146 附近暗云复合体的 ^<12>CO 和 ^<13>CO 观测。”