Using Multiple Methods to Evaluate Landward Migration of Seawater Intrusion in the Floridan Aquifer

Randich, Mikala; Czwartacki, Brooke J.; Callahan, Timothy J.; Vulava, Vijay M.

doi:10.1130/abs/2017se-290875

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“…They suggested that a possible reason for part of the disagreement between the observed and predicted mass-radius relation might be found in the still not satisfactory synthetic atmospheric structures used to obtain outer BCs for stellar models. However, such models systematically underestimate the effective temperature of VLM and LM stars in clusters, as shown by Randich et al (2017).…”

Section: Introductionmentioning

confidence: 99%

Theoretical uncertainties on the radius of low- and very-low-mass stars

Tognelli

Moroni

Degl’Innocenti

2018

Monthly Notices of the Royal Astronomical Society

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We performed an analysis of the main theoretical uncertainties that affect the radius of low-and very-low mass-stars predicted by current stellar models. We focused on stars in the mass range 0.1-1 M ⊙ , on both the zero-age main-sequence (ZAMS) and on 1, 2 and 5 Gyr isochrones. First, we quantified the impact on the radius of the uncertainty of several quantities, namely the equation of state, radiative opacity, atmospheric models, convection efficiency and initial chemical composition. Then, we computed the cumulative radius error stripe obtained by adding the radius variation due to all the analysed quantities.As a general trend, the radius uncertainty increases with the stellar mass. For ZAMS structures the cumulative error stripe of very-low mass stars is about ±2 and ±3 percent, while at larger masses it increases up to ±4 and ±5 percent. The radius uncertainty gets larger and age dependent if isochrones are considered, reaching for M ∼ 1 M ⊙ about +12(−15) percent at an age of 5 Gyr.We also investigated the radius uncertainty at a fixed luminosity. In this case, the cumulative error stripe is the same for both ZAMS and isochrone models and it ranges from about ±4 percent to +7 and +9(−5) percent.We also showed that the sole uncertainty on the chemical composition plays an important role in determining the radius error stripe, producing a radius variation that ranges between about ±1 and ±2 percent on ZAMS models with fixed mass and about ±3 and ±5 percent at a fixed luminosity.

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Section: Introductionmentioning

confidence: 99%