Search Results - "Mullan, D. J."

On the Possibility of an Upper Limit on Magnetically Induced Radius Inflation in Low-mass Stars by MacDonald, J., Mullan, D. J.

“…Abstract The radii of low-mass stars are observed to be inflated above standard model predictions, especially in magnetically active stars. Typically, the…”
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Origin of Radio-quiet Coronal Mass Ejections in Flare Stars by Mullan, D. J., Paudel, R. R.

“…Type II radio bursts are observed in the Sun in association with many coronal mass ejections (CMEs). In view of this association, there has been an expectation…”
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ROTATION–ACTIVITY CORRELATIONS IN K AND M DWARFS. I. STELLAR PARAMETERS AND COMPILATIONS OF v sin i AND P/sin i FOR A LARGE SAMPLE OF LATE-K AND M DWARFS by Houdebine, E R, Mullan, D J, Paletou, F, Gebran, M

“…ABSTRACT The reliable determination of rotation–activity correlations (RACs) depends on precise measurements of the following stellar parameters: T eff ,…”
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The Rotation–activity Correlations in K and M Dwarfs. II. New Constraints on the Dynamo Mechanisms in Late-K and M Dwarfs before and at the Transition to Complete Convection by Houdebine, E. R., Mullan, D. J., Bercu, B., Paletou, F., Gebran, M.

“…Abstract We study the rotation–activity correlations (RACs) in a sample of stars from spectral type dK4 to dM4. We study RACs using chromospheric data and…”
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Precision modelling of M dwarf stars: the magnetic components of CM Draconis by MacDonald, J., Mullan, D. J.

“…The eclipsing binary CM Draconis (CM Dra) contains two nearly identical red dwarfs of spectral class dM4.5. The masses and radii of the two components have…”
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Simultaneous Multiwavelength Flare Observations of EV Lacertae by Paudel, Rishi R., Barclay, Thomas, Schlieder, Joshua E., Quintana, Elisa V., Gilbert, Emily A., Vega, Laura D., Youngblood, Allison, L. Silverstein, Michele, Osten, Rachel A., Tucker, Michael A., Huber, Daniel, Do, Aaron, Hamaguchi, Kenji, Mullan, D. J., Gizis, John E., Monsue, Teresa A., Colón, Knicole D., Boyd, Patricia T., Davenport, James R. A., Walkowicz, Lucianne

“…We present the first results of our ongoing project conducting simultaneous multiwavelength observations of flares on nearby active M dwarfs. We acquired data…”
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K2 Ultracool Dwarfs Survey – V. High superflare rates on rapidly rotating late-M dwarfs by Paudel, R R, Gizis, J E, Mullan, D J, Schmidt, S J, Burgasser, A J, Williams, P K G, Youngblood, A, Stassun, K G

“…Abstract We observed strong superflares (defined as flares with energy in excess of 1033 erg) on three late-M dwarfs: 2MASS J08315742+2042213 (hereafter…”
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Are Magnetically Active Low-Mass M Dwarfs Completely Convective? by Mullan, D. J, MacDonald, J

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K2 Ultracool Dwarfs Survey. IV. Monster Flares Observed on the Young Brown Dwarf CFHT-BD-Tau 4 by Paudel, Rishi R., Gizis, John E., Mullan, D. J., Schmidt, Sarah J., Burgasser, Adam J., Williams, Peter K. G., Berger, Edo

“…We present photometric measurements of two superflares observed on a very young brown dwarf, CFHT-BD-Tau 4, observed during Campaign 13 of the Kepler K2…”
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Patterns of X-ray, Chromospheric, and Radio Emission in Low-mass Stars: Fast and Slow Magnetic Reconnection by Mullan, D. J

“…Magnetic reconnection events in the atmospheres of low-mass dwarf stars can be classified as either slow or fast, depending on whether ohmic diffusion or Hall…”
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Magnetic Models of the Brown Dwarfs HD 130948b and HD 130948c by Mullan, D. J, MacDonald, J

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From Solar and Stellar Flares to Coronal Heating: Theory and Observations of How Magnetic Reconnection Regulates Coronal Conditions by Cassak, P. A, Mullan, D. J, Shay, M. A

“…There is currently no explanation of why the corona has the temperature and density it has. We present a model that explains how the dynamics of magnetic…”
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Flares on a Bp Star by Mullan, D. J

“…Two large X-ray flares have been reported from the direction of a magnetic B2p star ( Delta *s Ori E). Sanz-Forcada et al. have suggested that the flares did…”
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Mechanical Energy Deposition in Cool Star Atmospheres: Resonant Coupling to Coronal Loops in M Dwarfs by Mullan, D. J.

“…Abstract The efficiency of coronal heating ε (cor) in a star can be quantified by L X / L bol , i.e., the ratio of X-ray luminosity to bolometric luminosity…”
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Coronal Heating Distribution Due to Low-Frequency, Wave-driven Turbulence by Dmitruk, P, Matthaeus, W. H, Milano, L. J, Oughton, S, Zank, G. P, Mullan, D. J

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Magnetic Modeling of Inflated Low-mass Stars Using Interior Fields No Larger than ∼10 kG by MacDonald, James, Mullan, D. J.

“…We have previously reported on models of low-mass stars in which the presence of inflated radii is ascribed to magnetic fields that impede the onset of…”
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APPARENT NON-COEVALITY AMONG THE STARS IN UPPER SCORPIO: RESOLVING THE PROBLEM USING A MODEL OF MAGNETIC INHIBITION OF CONVECTION by MacDonald, James, Mullan, D. J.

“…ABSTRACT Two eclipsing binaries in the USco association have recently yielded precise values of masses and radii for four low-mass members of the association…”
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Magnetic fields in massive stars: dynamics and origin by MacDonald, James, Mullan, D. J.

“…Evidence continues to accumulate in favour of the presence of magnetic fields on the surfaces of massive stars. Some authors hypothesize that such fields…”
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SOLAR CYCLE VARIATION OF SOUND SPEED INSIDE THE SUN by MULLAN, D. J, MACDONALD, J, RABELLO-SOARES, M. C

“…Empirical radial profiles of the changes in sound speed inside the Sun between solar minimum and solar maximum have been extracted from Michelson Doppler…”
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THOR 42: A Test of Magnetic Models for Pre-main-sequence Stars by MacDonald, J., Mullan, D. J.

“…Abstract Precise masses and radii have been reported by Murphy et al. for the components of the THOR 42 binary. Murphy et al. provide evidence that, in their…”
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