Now showing items 1-7 of 7

    • Accretion discs as regulators of stellar angular momentum evolution in the ONC and Taurus-Auriga 

      Davies, Claire; Gregory, Scott; Greaves, Jane Sophia (2014-10-21) - Journal article
      In light of recent substantial updates to spectral type estimations and newly established intrinsic colours, effective temperatures, and bolometric corrections for pre-main sequence (PMS) stars, we re-address the theory ...
    • A BCool magnetic snapshot survey of solar-type stars 

      Marsden, S. C.; Petit, P.; Jeffers, S. V.; Morin, J.; Fares, R.; Reiners, A.; do Nascimento, J. -D.; Auriere, M.; Bouvier, J.; Carter, B. D.; Catala, C.; Dintrans, B.; Donati, J. -F.; Gastine, T.; Jardine, M.; Konstantinova-Antova, R.; Lanoux, J.; Lignieres, F.; Morgenthaler, A.; Ramirez-Velez, J. C.; Theado, S.; Van Grootel, V.; BCool Collaboration (2014-11-11) - Journal article
      We present the results of a major high-resolution spectropolarimetric BCool project magnetic survey of 170 solar-type stars. Surface magnetic fields were detected on 67 stars, with 21 classified as mature solar-type stars, ...
    • Characterization of the gaseous companion κ Andromedae b New Keck and LBTI high-contrast observations 

      Bonnefoy, M.; Currie, T.; Marleau, G. -D.; Schlieder, J. E.; Wisniewski, J.; Carson, J.; Covey, K. R.; Henning, T.; Biller, B.; Hinz, P.; Klahr, H.; Boyer, A. N. Marsh; Zimmerman, N.; Janson, M.; McElwain, M.; Mordasini, C.; Skemer, A.; Bailey, V.; Defrere, D.; Thalmann, C.; Skrutskie, M.; Allard, F.; Homeier, D.; Tamura, M.; Feldt, M.; Cumming, A.; Grady, C.; Brandner, W.; Helling, C.; Witte, S.; Hauschildt, P.; Kandori, R.; Kuzuhara, M.; Fukagawa, M.; Kwon, J.; Kudo, T.; Hashimoto, J.; Kusakabe, N.; Abe, L.; Brandt, T.; Egner, S.; Guyon, O.; Hayano, Y.; Hayashi, M.; Hayashi, S.; Hodapp, K.; Ishii, M.; Iye, M.; Knapp, G.; Matsuo, T.; Mede, K.; Miyama, M.; Morino, J. -I.; Moro-Martin, A.; Nishimura, T.; Pyo, T.; Serabyn, E.; Suenaga, T.; Suto, H.; Suzuki, R.; Takahashi, T; Takami, M.; Takato, N.; Terada, H.; Tomono, D.; Turner, E.; Watanabe, M.; Yamada, T.; Takami, H.; Usuda, T. (2014-02-14) - Journal article
      Context. We previously reported the direct detection of a low-mass companion at a projected separation of 55 ± 2 AU around the B9-type star κ  Andromedae. The properties of the system (mass ratio, separation) make it a ...
    • Eclipsing Am binary systems in the SuperWASP survey 

      Smalley, B.; Southworth, J.; Pintado, O. I.; Gillon, M.; Holdsworth, D. L.; Anderson, D. R.; Barros, S. C. C.; Cameron, A. Collier; Delrez, L.; Faedi, E.; Haswell, C. A.; Hellier, C.; Horne, K.; Jehin, E.; Maxted, P. E. L.; Norton, A. J.; Pollacco, D.; Skillen, I.; Smith, A. M. S.; West, R. G.; Wheatley, P. J. (2014-04-08) - Journal article
      The results of a search for eclipsing Am star binaries using photometry from the SuperWASP survey are presented. The light curves of 1742 Am stars fainter than V = 8.0 were analysed for the presence of eclipses. A total ...
    • Influence of surface stressing on stellar coronae and winds 

      Jardine, M.; Vidotto, A. A.; van Ballegooijen, A.; Donati, J. -F.; Morin, J.; Fares, R.; Gombosi, T. I. (2013-05-01) - Journal article
      The large-scale field of the Sun is well represented by its lowest energy (or potential) state. Recent observations, by comparison, reveal that many solar-type stars show large-scale surface magnetic fields that are highly ...
    • Ionisation in atmospheres of Brown Dwarfs and extrasolar planets II Dust-induced collisional ionization 

      Helling, Christiane; Jardine, M.; Mokler, F. (2011-08-10) - Journal article
      Observations have shown that continuous radio emission and also sporadic Ha and X-ray emission are prominent in singular, low-mass objects later than spectral class M. These activity signatures are interpreted as being ...
    • Ionization in atmospheres of brown dwarfs and extrasolar planets. IV. The effect of cosmic rays 

      Rimmer, Paul; Helling, Christiane (2013-08-21) - Journal article
      Cosmic rays provide an important source for free electrons in Earth's atmosphere and also in dense interstellar regions where they produce a prevailing background ionization. We utilize a Monte Carlo cosmic ray transport ...