An ALMA 3 mm continuum census of Westerlund 1
An ALMA 3 mm continuum census of Westerlund 1
复制标题
Westerlund 的 ALMA 3 毫米连续普查 1
DOI：
10.1051/0004-6361/201832754
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发表时间：
2018
影响因子：
6.5
通讯作者：
Fenech D
中科院分区：
文献类型：
--
作者：
Fenech D
大质量恒星在星系团和星系演化中扮演着重要的角色，它们失去质量的速度是它们自身演化及其与环境相互作用的关键驱动力，包括它们的终端SNe爆炸。年轻的大质量星团提供了一个理想的机会来研究大质量恒星的共同演化群体，在那里可以详细研究它们的个体属性以及与环境的相互作用。我们的目标是研究银河系星系团Westerlund 1的组成恒星，以确定质量损失率的大质量恒星的不同后主序星人口。为了实现这一目标，我们用阿塔卡马大型毫米/亚毫米阵列进行了3毫米连续观测。我们在Westerlund 1中探测到了50颗恒星的辐射，包括视野内的所有21颗Wolf-Rayets，以及8颗冷恒星和21颗OB超巨星。发射星云与一些冷超巨星有关，而出乎意料的是，一些热恒星也出现空间分辨。我们能够测量一个独特的人口大质量后主序星的质量损失率在每个阶段的演变，确认了显着增加的恒星从OB超巨星过渡到WR状态通过LBV和/或冷超巨星阶段。幸运的是，OB超巨星所展示的光谱类型范围为辐射驱动风理论提供了一个关键的测试，特别是双稳定性跳跃的现实。与其他星团成员相比，相互作用双星Wd 1 -9的极端质量损失率证实了双星在大质量恒星演化中的关键作用。在一些OB和WR恒星周围存在致密星云是出乎意料的;通过类比冷的超巨星/超巨星，我们将其归因于通过与星团内介质/风的相互作用对恒星风的限制和塑造。鉴于核心坍缩的形态SNe取决于爆炸前的星周环境的性质，如果这一假设是正确的，那么爆炸的性质不仅取决于祖先，而且还取决于它所处的环境。
Massive stars play an important role in both cluster and galactic evolution and the rate at which they lose mass is a key driver of both their own evolution and their interaction with the environment up to and including their terminal SNe explosions. Young massive clusters provide an ideal opportunity to study a co-eval population of massive stars, where both their individual properties and the interaction with their environment can be studied in detail. We aim to study the constituent stars of the Galactic cluster Westerlund 1 in order to determine mass-loss rates for the diverse post-main sequence population of massive stars. To accomplish this we made 3mm continuum observations with the Atacama Large Millimetre/submillimetre Array. We detected emission from 50 stars in Westerlund 1, comprising all 21 Wolf-Rayets within the field of view, plus eight cool and 21 OB super-/hypergiants. Emission nebulae were associated with a number of the cool hypergiants while, unexpectedly, a number of hot stars also appear spatially resolved. We were able to measure the mass-loss rates for a unique population of massive post-main sequence stars at every stage of evolution, confirming a significant increase as stars transitioned from OB supergiant to WR states via LBV and/or cool hypergiant phases. Fortuitously, the range of spectral types exhibited by the OB supergiants provides a critical test of radiatively-driven wind theory and in particular the reality of the bi-stability jump. The extreme mass-loss rate inferred for the interacting binary Wd1-9 in comparison to other cluster members confirmed the key role binarity plays in massive stellar evolution. The presence of compact nebulae around a number of OB and WR stars is unexpected; by analogy to the cool super-/hypergiants we attribute this to confinement and sculpting of the stellar wind via interaction with the intra-cluster medium/wind. Given the morphologies of core collapse SNe depend on the nature of the pre-explosion circumstellar environment, if this hypothesis is correct then the properties of the explosion depend not just on the progenitor, but also the environment in which it is located.
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DOI：
10.1086/499776
发表时间：
2005-09
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
M. Muno;J. Clark;P. Crowther;S. Dougherty;R. Grijs;C. Law;S. McMillan;M. Morris;I. Negueruela;D. Pooley;Simon Portegies;Zwart
通讯作者：
M. Muno;J. Clark;P. Crowther;S. Dougherty;R. Grijs;C. Law;S. McMillan;M. Morris;I. Negueruela;D. Pooley;Simon Portegies;Zwart
银河 M 超巨星的硅酸盐和碳氢化合物排放
DOI：
10.1046/j.1365-8711.1998.02078.x
发表时间：
1998
影响因子：
4.8
作者：
R. J. Sylvester;C. Skinner;M. Barlow
通讯作者：
M. Barlow
影响因子：
6.5
作者：
Brott, I.;Evans, C. J.;Anders, P.
通讯作者：
Anders, P.
煎蛋星云的 ALMA 致密阵列观测：黄超巨星 IRAS 17163-3907 大规模不对称质量损失的证据。
影响因子：
6.5
作者：
S. Wallström;E. Lagadec;S. Muller;J. Black;N. Cox;N. Cox;R. Galván;K. Justtanont;S. Longmore;H. Olofsson;R. D. Oudmaijer;G. Quintana;R. Szczerba;W. Vlemmings;H. V. Winckel;A. Zijlstra
通讯作者：
A. Zijlstra
ALMA 对超巨星 B[e] 星 Wd1-9 的观测
DOI：
--
发表时间：
2016
期刊：
影响因子：
--
作者：
D. Fenech;J. Clark;R. Prinja;J. Morford;S. Dougherty;R. Blomme
通讯作者：
R. Blomme