Search Results - "Saikia, S Boro"

Nonthermal Motions and Atmospheric Heating of Cool Stars by Boro Saikia, S., Lueftinger, T., Airapetian, V. S., Ayres, T., Bartel, M., Guedel, M., Jin, M., Kislyakova, K. G., Testa, P.

“…Abstract The magnetic processes associated with the nonthermal broadening of optically thin emission lines appear to carry enough energy to heat the corona and…”
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The connection between stellar activity cycles and magnetic field topology by See, V., Jardine, M., Vidotto, A. A., Donati, J.-F., Boro Saikia, S., Bouvier, J., Fares, R., Folsom, C. P., Gregory, S. G., Hussain, G., Jeffers, S. V., Marsden, S. C., Morin, J., Moutou, C., do Nascimento, J. D., Petit, P., Waite, I. A.

“…Zeeman–Doppler imaging (ZDI) has successfully mapped the large-scale magnetic fields of stars over a large range of spectral types, rotation periods and ages…”
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Studying stellar spin-down with Zeeman–Doppler magnetograms by See, V, Jardine, M, Vidotto, A A, Donati, J-F, Saikia, S Boro, Fares, R, Folsom, C P, Hebrard, E M, Jeffers, S V, Marsden, S C, Morin, J, Petit, P, Waite, I A

“…Magnetic activity and rotation are known to be intimately linked for low-mass stars. Understanding rotation evolution over the stellar lifetime is therefore an…”
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The energy budget of stellar magnetic fields by See, V., Jardine, M., Vidotto, A. A., Donati, J.-F., Folsom, C. P., Boro Saikia, S., Bouvier, J., Fares, R., Gregory, S. G., Hussain, G., Jeffers, S. V., Marsden, S. C., Morin, J., Moutou, C., do Nascimento, J. D., Petit, P., Rosén, L., Waite, I. A.

“…Spectropolarimetric observations have been used to map stellar magnetic fields, many of which display strong bands of azimuthal fields that are toroidal. A…”
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Linking chromospheric activity and magnetic field properties for late-type dwarf stars by Brown, E L, Jeffers, S V, Marsden, S C, Morin, J, Boro Saikia, S, Petit, P, Jardine, M M, See, V, Vidotto, A A, Mengel, M W, Dahlkemper, M N, the BCool Collaboration

“…ABSTRACT Spectropolarimetric data allow for simultaneous monitoring of stellar chromospheric $\log {R^{\prime }_{\rm {HK}}}$ activity and the surface-averaged…”
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The open flux evolution of a solar-mass star on the main sequence by See, V., Jardine, M., Vidotto, A. A., Donati, J.-F., Boro Saikia, S., Fares, R., Folsom, C. P., Jeffers, S. V., Marsden, S. C., Morin, J., Petit, P.

“…Abstract Magnetic activity is known to be correlated to the rotation period for moderately active main-sequence solar-like stars. In turn, the stellar rotation…”
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Magnetic fields on young, moderately rotating Sun-like stars – I. HD 35296 and HD 29615 by Waite, I. A., Marsden, S. C., Carter, B. D., Petit, P., Donati, J.-F., Jeffers, S. V., Boro Saikia, S.

“…Observations of the magnetic fields of young solar-type stars provide a way to investigate the signatures of their magnetic activity and dynamos…”
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Could a change in magnetic field geometry cause the break in the wind-activity relation? by Vidotto, A. A., Donati, J.-F., Jardine, M., See, V., Petit, P., Boisse, I., Boro Saikia, S., Hébrard, E., Jeffers, S. V., Marsden, S. C., Morin, J.

“…Wood et al. suggested that mass-loss rate is a function of X-ray flux ( $\skew{3}\dot{M}\propto F_x^{1.34}$ ) for dwarf stars with F x ≲ F x,6 ≡ 106 erg…”
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The relation between stellar magnetic field geometry and chromospheric activity cycles – I. The highly variable field of ε Eridani at activity minimum by Jeffers, S. V., Boro Saikia, S., Barnes, J. R., Petit, P., Marsden, S. C., Jardine, M. M., Vidotto, A. A.

“…Abstract The young and magnetically active K dwarf ε Eridani exhibits a chromospheric activity cycle of about 3 yr. Previous reconstructions of its large-scale…”
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The impact of unresolved magnetic spots on high-precision radial velocity measurements by Lisogorskyi, M, Saikia, S Boro, Jeffers, S V, Jones, H R A, Morin, J, Mengel, M, Reiners, A, Vidotto, A A, Petit, P

“…ABSTRACT The Doppler method of exoplanet detection has been extremely successful, but suffers from contaminating noise from stellar activity. In this work, a…”
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X-ray detection of astrospheres around three main-sequence stars and their mass-loss rates by Kislyakova, K. G., Güdel, M., Koutroumpa, D., Carter, J. A., Lisse, C. M., Boro Saikia, S.

“…Stellar winds of cool main-sequence stars are difficult to constrain observationally. One way to measure stellar mass-loss rates is to detect the soft X-ray…”
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X-ray detection of astrospheres around three main-sequence stars and their mass-loss rates by Kislyakova, K. G, Güdel, M, Koutroumpa, D, Carter, J. A, Lisse, C. M, Saikia, S. Boro

“…Stellar winds of cool main sequence stars are very difficult to constrain observationally. One way to measure stellar mass loss rates is to detect soft X-ray…”
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Non-thermal motions and atmospheric heating of cool stars by Saikia, S. Boro, Lueftinger, T, Airapetian, V. S, Ayres, T, Bartel, M, Guedel, M, Jin, M, Kislyakova, K. G, Testa, P

“…The magnetic processes associated with the non-thermal broadening of optically thin emission lines appear to carry enough energy to heat the corona and…”
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Linking chromospheric activity and magnetic field properties for late-type dwarf stars by Brown, E. L, Jeffers, S. V, Marsden, S. C, Morin, J, Saikia, S. Boro, Petit, P, Jardine, M. M, See, V, Vidotto, A. A, Mengel, M. W, Dahlkemper, M. N, Collaboration, the BCool

“…Spectropolarimetric data allow for simultaneous monitoring of stellar chromospheric $\log{R^{\prime}_{\rm{HK}}}$ activity and the surface-averaged longitudinal…”
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The crucial role of surface magnetic fields for stellar dynamos: Epsilon Eridani, 61 Cygni A, and the Sun by Jeffers, S. V, Cameron, R. H, Marsden, S. C, Saikia, S. Boro, Folsom, C. P, Jardine, M. M, Morin, J, Petit, P, See, V, Vidotto, A. A, Wolter, U, Mittag, M

“…Cool main-sequence stars, such as the Sun, have magnetic fields which are generated by an internal dynamo mechanism. In the Sun, the dynamo mechanism produces…”
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Time evolution of magnetic activity cycles in young suns: The curious case of kappa Ceti by Saikia, S. Boro, Lueftinger, T, Folsom, C. P, Antonova, A, Alecian, E, Donati, J. -F, Guedel, M, Hall, J. C, Jeffers, S. V, Kochukhov, O, Marsden, S. C, Metodieva, Y. T, Mittag, M, Morin, J, Perdelwitz, V, Petit, P, Schmid, M, Vidotto, A. A

“…A detailed investigation of the magnetic properties of young Sun-like stars can provide valuable information on our Sun's magnetic past and its impact on the…”
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The solar wind from a stellar perspective: how do low-resolution data impact the determination of wind properties? by Saikia, S. Boro, Jin, M, Johnstone, C. P, Lüftinger, T, Güdel, M, Airapetian, V. S, Kislyakova, K. G, Folsom, C. P

“…Alfv\'en-wave-driven 3D magnetohydrodynamic (MHD) models, which are increasingly used to predict stellar wind properties, contain unconstrained parameters and…”
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Chromospheric activity catalogue of 4454 cool stars. Questioning the active branch of stellar activity cycles by Saikia, S. Boro, Marvin, C. J, Jeffers, S. V, Reiners, A, Cameron, R, Marsden, S. C, Petit, P, Warnecke, J, Yadav, A. P

“…A&A 616, A108 (2018) Chromospheric activity monitoring of a wide range of cool stars can provide valuable information on stellar magnetic activity and its…”
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Direct evidence of a full dipole flip during the magnetic cycle of a sun-like star by Saikia, S. Boro, Lueftinger, T, Jeffers, S. V, Folsom, C. P, See, V, Petit, P, Marsden, S. C, Vidotto, A. A, Morin, J, Reiners, A, Guedel, M, collaboration, the BCool

“…The behaviour of the large-scale dipolar field, during a star's magnetic cycle, can provide valuable insight into the stellar dynamo and associated magnetic…”
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The relation between stellar magnetic field geometry and chromospheric activity cycles I: The highly variable field of Epsilon Eridani at activity minimum by Jeffers, S. V, Saikia, S. Boro, Barnes, J. R, Petit, P, Marsden, S. C, Jardine, M. M, Vidotto, A. A

“…The young and magnetically active K dwarf Epsilon Eridani exhibits a chromospheric activity cycle of about 3 years. Previous reconstructions of its large-scale…”
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