Making bright giants invisible at the Galactic Centre

doi:10.1093/mnras/stz3507

CSpace

	Making bright giants invisible at the Galactic Centre
	Amaro-Seoane, Pau 1,2,3,4,5; Chen, Xian 6,7; Schodel, Rainer 8; Casanellas, Jordi 9
	2020-02-01
发表期刊	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN	0035-8711
卷号	492 期号:1 页码:250-255
摘要	Current observations of the Galactic Centre (GC) seem to display a core-like distribution of bright stars from similar to 5 arcsec inwards. On the other hand, we observe young, massive stars at the GC, with roughly 20-50 per cent of them in a disc, mostly in the region where the bright giants appear to be lacking. In a previous publication we put the idea forward that the missing stars are deeply connected to the presence of this disc. The progenitor of the stellar disc is very likely to have been a gaseous disc that at some point fragmented and triggered star formation. This caused the appearance of overdensity regions in the disc that had high enough densities to ensure stripping large giants of their atmospheres and thus rendering them very faint. In this paper, we use a stellar evolution code to derive the properties that a red giant would display in a colour-magnitude diagram, as well as a non-linearity factor required for a correct estimate of the mass loss. We find that in a very short time-scale, the red giants leave their standard evolutionary track. The non-linearity factor has values that not only depend on the properties of the clumps, but also on the physical conditions of the giant stars, as we predicted analytically. According to our results, envelope stripping works, moving stars on a short time-scale from the giant branch to the white dwarf stage, thus rendering them invisible to observations.
关键词	stars: atmospheres Hertzsprung-Russell and colour-magnitude diagrams stars: horizontal branch white dwarfs galaxies: nuclei
DOI	10.1093/mnras/stz3507
收录类别	SCI
语种	英语
资助项目	Ramon y Cajal Programme of the Ministry of Economy, Industry and Competitiveness of Spain ; COST Action[GWverse CA16104] ; National Key R&D Program of China[2016YFA0400702] ; National Science Foundation of China[11721303] ; National Science Foundation of China[11873022] ; European Research Council under the European Union's Seventh Framework Programme (FP7/2007-2013)/ERC[614922] ; State Agency for Research of the Spanish MCIU through the 'Center of Excellence Severo Ochoa' award[SEV-2017-0709] ; MCIU/AEI/FEDER, UE[PGC2018-095049-B-C21]
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
WOS记录号	WOS:000512329900018
出版者	OXFORD UNIV PRESS
引用统计
文献类型	期刊论文
条目标识符	http://ir.amss.ac.cn/handle/2S8OKBNM/50820
专题	中国科学院数学与系统科学研究院
通讯作者	Amaro-Seoane, Pau; Chen, Xian
作者单位	1.CSIC, Inst Space Sci ICE, Campus UAB,Carrer Can Magrans S-N, E-08193 Barcelona, Spain 2.IEEC, Campus UAB,Carrer Can Magrans S-N, E-08193 Barcelona, Spain 3.Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 4.Chinese Acad Sci, Acad Math & Syst Sci, Inst Appl Math, Beijing 100190, Peoples R China 5.TU Berlin, Zentrum Astron & Astrophys, Hardenbergstr 36, D-10623 Berlin, Germany 6.Peking Univ, Sch Phys, Astron Dept, Beijing 100871, Peoples R China 7.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 8.Inst Astrofis Analucia, Glorieta Astron S-N, E-18008 Granada, Spain 9.Dataguda, Septimania 41, Barcelona 08006, Spain
推荐引用方式 GB/T 7714	Amaro-Seoane, Pau,Chen, Xian,Schodel, Rainer,et al. Making bright giants invisible at the Galactic Centre[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,492(1):250-255.
APA	Amaro-Seoane, Pau,Chen, Xian,Schodel, Rainer,&Casanellas, Jordi.(2020).Making bright giants invisible at the Galactic Centre.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,492(1),250-255.
MLA	Amaro-Seoane, Pau,et al."Making bright giants invisible at the Galactic Centre".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 492.1(2020):250-255.