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The G Plus M Eclipsing Binary V530 Orionis: A Stringent Test of Magnetic Stellar Evolution Models for Low-Mass Stars
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy. (Theoretical Astrophysics)ORCID iD: 0000-0002-2012-7215
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2014 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 797, no 1, 31- p.Article in journal (Refereed) Published
Abstract [en]

We report extensive photometric and spectroscopic observations of the 6.1 day period, G+M-type detached double-lined eclipsing binary V530 Ori, an important new benchmark system for testing stellar evolution models for low-mass stars. We determine accurate masses and radii for the components with errors of 0.7% and 1.3%, as follows: M-A = 1.0038 +/- 0.0066 M-circle dot, M-B = 0.5955 +/- 0.0022 M-circle dot, R-A = 0.980 +/- 0.013 R-circle dot, and R-B = 0.5873 +/- 0.0067 R-circle dot. The effective temperatures are 5890 +/- 100K (G1 v) and 3880 +/- 120K (M1 v), respectively. A detailed chemical analysis probing more than 20 elements in the primary spectrum shows the system to have a slightly subsolar abundance, with [Fe/H] = -0.12 +/- 0.08. A comparison with theory reveals that standard models underpredict the radius and overpredict the temperature of the secondary, as has been found previously for other M dwarfs. On the other hand, models from the Dartmouth series incorporating magnetic fields are able to match the observations of the secondary star at the same age as the primary (similar to 3 Gyr) with a surface field strength of 2.1 +/- 0.4 kG when using a rotational dynamo prescription, or 1.3 +/- 0.4 kG with a turbulent dynamo approach, not far from our empirical estimate for this star of 0.83 +/- 0.65 kG. The observations are most consistent with magnetic fields playing only a small role in changing the global properties of the primary. The V530 Ori system thus provides an important demonstration that recent advances in modeling appear to be on the right track to explain the long-standing problem of radius inflation and temperature suppression in low-mass stars.

Place, publisher, year, edition, pages
2014. Vol. 797, no 1, 31- p.
Keyword [en]
binaries: eclipsing, stars: evolution, stars: fundamental parameters, stars: individual (V530 Ori), techniques: photometric
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-240203DOI: 10.1088/0004-637X/797/1/31ISI: 000345915000031OAI: oai:DiVA.org:uu-240203DiVA: diva2:776507
Available from: 2015-01-07 Created: 2015-01-06 Last updated: 2015-06-10Bibliographically approved

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