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Estimating stellar wind parameters from low-resolution magnetograms
- Source :
- Monthly Notices of the Royal Astronomical Society: Letters. 465:L25-L29
- Publication Year :
- 2016
- Publisher :
- Oxford University Press (OUP), 2016.
-
Abstract
- Stellar winds govern the angular momentum evolution of solar-like stars throughout their main-sequence lifetime. The efficiency of this process depends on the geometry of the star's magnetic field. There has been a rapid increase recently in the number of stars for which this geometry can be determined through spectropolarimetry. We present a computationally efficient method to determine the 3D geometry of the stellar wind and to estimate the mass loss rate and angular momentum loss rate based on these observations. Using solar magnetograms as examples, we quantify the extent to which the values obtained are affected by the limited spatial resolution of stellar observations. We find that for a typical stellar surface resolution of 20$^{\rm o}$-30$^{\rm o}$, predicted wind speeds are within 5$\%$ of the value at full resolution. Mass loss rates and angular momentum loss rates are within 5-20$\%$. In contrast, the predicted X-ray emission measures can be under-estimated by 1-2 orders of magnitude, and their rotational modulations by 10-20$\%$.<br />Comment: 6 pages, 6 figures
- Subjects :
- Angular momentum
010504 meteorology & atmospheric sciences
NDAS
FOS: Physical sciences
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
coronae [Stars]
Stellar-wind bubble
01 natural sciences
Wind speed
0103 physical sciences
QB Astronomy
Astrophysics::Solar and Stellar Astrophysics
010303 astronomy & astrophysics
QC
Solar and Stellar Astrophysics (astro-ph.SR)
Astrophysics::Galaxy Astrophysics
QB
0105 earth and related environmental sciences
Physics
Stellar rotation
Astronomy and Astrophysics
Orders of magnitude (angular velocity)
Magnetic field
Stars
QC Physics
Astrophysics - Solar and Stellar Astrophysics
Space and Planetary Science
Magnetic fields
Stellar mass loss
winds, outflow [Stars]
Astrophysics::Earth and Planetary Astrophysics
Subjects
Details
- ISSN :
- 17453933 and 17453925
- Volume :
- 465
- Database :
- OpenAIRE
- Journal :
- Monthly Notices of the Royal Astronomical Society: Letters
- Accession number :
- edsair.doi.dedup.....c9ac4b547c5da7aa257b0cef565b3f2c