Physical Sciences and Mathematics Commons^™

A Bright Short Period M-M Eclipsing Binary From The Kelt Survey: Magnetic Activity And The Mass–Radius Relationship For M Dwarfs, J. B. Lubin, J. E. Rodriguez, G. Zhou, K. E. Conroy, K. G. Stassun, K. Collins, D. J. Stevens, J. Labadie-Bartz, C. Stockdale, G. Myers, K. D. Colón, J. Bento, P. Kehusmaa, R. Petrucci, E. Jofré, S. N. Quinn, M. B. Lund, R. B. Kuhn, R. J. Siverd, T. G. Beatty, C. Harlingten, J. Pepper, B. S. Gaudi, D. James, Eric L.N. Jensen, D. Reichart, L. Kedziora-Chudczer, J. Bailey, G. Melville

Physics & Astronomy Faculty Works

We report the discovery of KELT J041621-620046, a moderately bright (J ~ 10.2) M-dwarf eclipsing binary system at a distance of 39 ± 3 pc. KELT J041621-620046 was first identified as an eclipsing binary using observations from the Kilodegree Extremely Little Telescope (KELT) survey. The system has a short orbital period of ~1.11 days and consists of components with and in nearly circular orbits. The radii of the two stars are and . Full system and orbital properties were determined (to ∼10% error) by conducting an EBOP (Eclipsing Binary Orbit Program) global modeling of the high precision photometric and spectroscopic …

Prediction Of A Red Nova Outburst In Kic 9832227, Lawrence A. Molnar, Daniel M. Van Noord, Karen Kinemuchi, Jason P. Smolinski

University Faculty Publications and Creative Works

We present the first identification of a candidate precursor for an imminent red nova. Our prediction is based on the example of the precursor to the red nova V1309 Sco, which was retrospectively found to be a contact binary with an exponentially decreasing period. We explore the use of this distinctive timing signature to identify precursors, developing the observational and analysis steps needed. We estimate that our Galaxy has roughly 1-10 observable precursors. Specifically, we lay out the observational case for KIC 9832227, which we identified as a tentative candidate two years ago (Molnar et al. 2015, AAS Meeting #225 …

Revealing The Structure Of The Outer Disks Of Be Stars, Robert Klement, Anthony C. Carciofi, Thomas Rivinius, Lynn D. Matthews, Rodrigo G. Vieira, Richard Ignace, Jon E. Bjorkman, B. C. Mota, Daniel M. Faes, A. D. Bratcher, M. Cure, Stanislav Stefl

ETSU Faculty Works

Context. The structure of the inner parts of Be star disks (≲ 20 stellar radii) is well explained by the viscous decretion disk (VDD) model, which is able to reproduce the observable properties of most of the objects studied so far. The outer parts, on the other hand, are not observationally well-explored, as they are observable only at radio wavelengths. A steepening of the spectral slope somewhere between infrared and radio wavelengths was reported for several Be stars that were previously detected in the radio, but a convincing physical explanation for this trend has not yet been provided.

Aims. We …