Testing the Accretion-Outflow Paradigma.

测试吸积-流出范式。

• 批准号: 247815996
• 负责人: Dr. Christian Schneider
• 金额: --
• 依托单位: Hamburger Sternwarte
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/247815996?language=en
• 关键词: Testing; Accretion; Outflow; Paradigma.

We propose to use CAFE to test a fundamental property of stellar jet launching theory, namely the relation of mass-accretion and mass-loss. Young stellar objects (YSOs) are thought to eject _ 10% of the accreted mass in bi-polar jets from the system. This fraction is a key parameter of jet theories, but a plasma temperature of 104 K is usually assumed to derive this value. However, two recent findings require to thoroughly test the general validity of this assumption: (A) Some YSO jets contain plasma exceeding 106 K, and (B) the slow jets of young brown dwarfs eject about the same mass as is accreted. We propose to measures lines tracing higher temperature plasma, e.g., [O ii] and [O iii], in a sample of jet-driving YSOs to check whether a significant fraction of the mass-loss has been missed.

我们建议用CAFE来检验恒星喷流发射理论的一个基本性质，即质量吸积和质量损失的关系。年轻的恒星天体（yso）被认为以双极喷流的形式从系统中喷射出10%的吸积质量。这个分数是射流理论的一个关键参数，但通常假设等离子体温度为104 K才能得出这个值。然而，最近的两项发现需要彻底检验这一假设的普遍有效性：(A)一些YSO喷流含有超过106k的等离子体，(B)年轻褐矮星的缓慢喷流喷出的质量与被吸积的质量大致相同。我们建议在喷射驱动的yso样品中测量追踪高温等离子体的谱线，例如[O ii]和[O iii]，以检查是否遗漏了质量损失的重要部分。