Zobrazeno 1 - 10
of 311
pro vyhledávání: '"Dunstone, N."'
Autor:
Waite, I. A., Marsden, S. C., Carter, B. D., Hart, R., Donati, J. -F., Vélez, J. C. Ramírez, Semel, M., Dunstone, N.
We present photometry and spectropolarimetry of the pre-main sequence star HD 106506. A photometric rotational period of ~1.416 +/- 0.133 days has been derived using observations at Mount Kent Observatory (MKO). Spectropolarimetric data taken at the
Externí odkaz:
http://arxiv.org/abs/1102.3475
Autor:
Marsden, S. C., Jardine, M. M., Vélez, J. C. Ramírez, Alecian, E., Brown, C. J., Carter, B. D., Donati, J. F., Dunstone, N., Hart, R., Semel, M., Waite, I. A.
Spectropolarimetric observations of the pre-main sequence early-G star HD 141943 were obtained at three observing epochs (2007, 2009 and 2010). The observations were obtained using the 3.9-m Anglo-Australian telescope with the UCLES echelle spectrogr
Externí odkaz:
http://arxiv.org/abs/1101.5866
Autor:
Marsden, S. C., Jardine, M. M., Vélez, J. C. Ramírez, Alecian, E., Brown, C. J., Carter, B. D., Donati, J. F., Dunstone, N., Hart, R., Semel, M., Waite, I. A.
Spectroscopic and spectropolarimetric observations of the pre-main sequence early-G star HD 141943 were obtained at four observing epochs (in 2006, 2007, 2009 and 2010). The observations were undertaken at the 3.9-m Anglo-Australian Telescope using t
Externí odkaz:
http://arxiv.org/abs/1101.5859
Autor:
Velez, J. C. Ramirez, Semel, M., Stift, M., Gonzalez, M. J. Martinez, Petit, P., Dunstone, N.
In this paper we study the feasibility of inferring the magnetic field from polarized multi-line spectra using two methods: The pseudo line approach and The PCA-ZDI approach. We use multi-line techniques, meaning that all the lines of a stellar spect
Externí odkaz:
http://arxiv.org/abs/1001.1003
Autor:
Hussain, G. A. J., Cameron, A. Collier, Jardine, M. M., Dunstone, N., Velez, J. Ramirez, Stempels, H. C., Donati, J. -F., Semel, M., Aulanier, G., Harries, T., Bouvier, J., Dougados, C., Ferreira, J., Carter, B. D., Lawson, W. A.
We have produced brightness and magnetic field maps of the surfaces of CV Cha and CR Cha: two actively accreting G and K-type T Tauri stars in the Chamaeleon I star-forming cloud with ages of 3-5 Myr. Our magnetic field maps show evidence for strong,
Externí odkaz:
http://arxiv.org/abs/0905.0914
Autor:
Dunstone, N. J., Hussain, G. A. J., Cameron, A. Collier, Marsden, S. C., Jardine, M., Barnes, J. R., Vlex, J. C. Ramirez, Donati, J. -F.
We present the first measurements of surface differential rotation on a pre-main sequence binary system. Using intensity (Stokes I) and circularly polarised (Stokes V) timeseries spectra, taken over eleven nights at the Anglo-Australian Telescope (AA
Externí odkaz:
http://arxiv.org/abs/0804.2491
Autor:
Dunstone, N. J., Hussain, G. A. J., Cameron, A. Collier, Marsden, S. C., Jardine, M., Stempels, H. C., Vlex, J. C. Ramirez, Donati, J. -F.
We present the first maps of the surface magnetic fields of a pre-main sequence binary system. Spectropolarimetric observations of the young, 18 Myr, HD 155555 (V824 Ara, G5IV + K0IV) system were obtained at the Anglo-Australian Telescope in 2004 and
Externí odkaz:
http://arxiv.org/abs/0803.0837
Autor:
Stempels, H. C., Hebb, L., Stassun, K. G., Holtzman, J., Dunstone, N., Glowienka, L., Frandsen, S.
In this paper we present the first results of a detailed spectroscopic and photometric analysis of the V = 11.7m eclipsing binary ASAS J052821+0338.5. With the FIES spectrograph at the Nordic Optical Telescope we have obtained a series of high-resolu
Externí odkaz:
http://arxiv.org/abs/0801.3927
Autor:
Hussain, G. A. J., Jardine, M., Donati, J. -F., Brickhouse, N. S., Dunstone, N. J., Wood, K., Dupree, A. K., Cameron, A. Collier, Favata, F.
Publikováno v:
Mon.Not.Roy.Astron.Soc.377:1488-1502,2007
We obtain contemporaneous observations of the surface and corona of AB Dor using ground-based circularly polarised spectra from the Anglo-Australian Telescope and X-ray data from the Chandra satellite. The ground-based data are used to construct surf
Externí odkaz:
http://arxiv.org/abs/astro-ph/0703619
Observations of stellar prominences on young rapidly rotating stars provide unique probes of their magnetic fields out to many stellar radii. We compare two independently obtained datasets of the K3 dwarf Speedy Mic using the Anglo-Australian Telesco
Externí odkaz:
http://arxiv.org/abs/astro-ph/0610106