Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· On-line Data
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Coronal and Transition Region Heating due to Magnetic Activity on Metal-Poor Dwarf Stars
Authors:
Brown, Alexander
Publication:
Chandra proposal ID #10200840
Publication Date:
09/2008
Origin:
CXO
Comment:
Chandra proposal ID #10200840
Bibliographic Code:
2008cxo..prop.2537B

Abstract

How does low metallicity affect the heating and resultant temperature structure of the chromospheres/transition regions/coronae of old solar-like dwarf stars? Our ACIS-S observations of 7 Gyr old Arcturus Moving Group (AMG) dwarfs show very little conventional coronal (> 1 MK) plasma and suggest that these stars have insufficient magnetic energy input to power a solar-like corona. However, they do have chomospheres and transition regions similar to the minimum activity Quiet Sun. It this typical or an aberration of the AMG? We propose a 35 ksec ACIS-S observation of the nearest (9.2 pc), truely metal-poor ([Fe/H] = -1.4) dwarf star that is known to have definite magnetic dynamo activity (activity cycles, active region modulation) -- HD103095 -- to investigate this question further.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints
    


SAO/NASA ADS Homepage | ADS Sitemap | Query Form | Basic Search | Preferences | HELP | FAQ