| 2. |
- Feiden, Gregory, 1986-
(författare)
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Eclipsing binary systems as tests of low-mass stellar evolution theory
- 2015
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Ingår i: Living Together. - 9781583818770 - 9781583818763 ; , s. 137-152
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Stellar fundamental properties (masses, radii, effective temperatures) can be extracted from observations of eclipsing binary systems with remarkable precision, often better than 2%. Such precise measurements afford us the opportunity to confront the validity of basic predictions of stellar evolution theory, such as the mass-radius relationship. A brief historical overview of confrontations between stellar models and data from eclipsing binaries is given, highlighting key results and physical insight that have led directly to our present understanding. The current paradigm that standard stellar evolution theory is insufficient to describe the most basic relation, that of a star's mass to its radius, along the main sequence is then described. Departures of theoretical expectations from empirical data, however, provide a rich opportunity to explore various physical solutions, improving our understanding of important stellar astrophysical processes.
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| 3. |
- Torres, Guillermo, et al.
(författare)
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The Benchmark Eclipsing Binary V530 Ori : A Critical Test of Magnetic Evolution Models for Low-Mass Stars
- 2015
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Ingår i: Living Together. - 9781583818770 - 9781583818763 ; , s. 169-173
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Konferensbidrag (refereegranskat)abstract
- We report accurate measurements of the physical properties (mass, radius, temperature) of components of the G+M eclipsing binary V530 On. The M-type secondary shows a larger radius and a cooler temperature than predicted by standard stellar evolution models, as has been found for many other low-mass stars and ascribed to the effects of magnetic activity and/or spots. We show that models from the Dartmouth series that incorporate magnetic fields are able to match the observations with plausible field strengths of 1-2 kG, consistent with a rough estimate we derive for that star.
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