Zobrazeno 1 - 10
of 46
pro vyhledávání: '"Nordsieck, K. H."'
Autor:
Todt, H., Kniazev, A. Y., Gvaramadze, V. V., Hamann, W. -R., Buckley, D., Crause, L., Crawford, S. M., Gulbis, A. A. S., Hettlage, C., Hooper, E., Husser, T. -O., Kotze, P., Loaring, N., Nordsieck, K. H., O'Donoghue, D., Pickering, T., Potter, S., Romero-Colmenero, E., Vaisanen, P., Williams, T., Wolf, M.
A considerable fraction of the central stars of planetary nebulae (CSPNe) are hydrogen-deficient. Almost all of these H-deficient central stars (CSs) display spectra with strong carbon and helium lines. Most of them exhibit emission line spectra rese
Externí odkaz:
http://arxiv.org/abs/1301.1944
Autor:
Gvaramadze, V. V., Kniazev, A. Y., Miroshnichenko, A. S., Berdnikov, L. N., Langer, N., Stringfellow, G. S., Todt, H., Hamann, W. -R., Grebel, E. K., Buckley, D., Crause, L., Crawford, S., Gulbis, A., Hettlage, C., Hooper, E., Husser, T. -O., Kotze, P., Loaring, N., Nordsieck, K. H., O'Donoghue, D., Pickering, T., Potter, S., Colmenero, E. Romero, Vaisanen, P., Williams, T., Wolf, M., Reichart, D. E., Ivarsen, K. M., Haislip, J. B., Nysewander, M. C., LaCluyze, A. P.
We report the discovery of two new Galactic candidate luminous blue variable (cLBV) stars via detection of circular shells (typical of known confirmed and cLBVs) and follow-up spectroscopy of their central stars. The shells were detected at 22 um in
Externí odkaz:
http://arxiv.org/abs/1201.2854
Polarization has been detected at early times for all types of supernova, indicating that such systems result from or quickly develop some form of asymmetry. In addition, the detection of strong line polarization in supernovae is suggestive of chemic
Externí odkaz:
http://arxiv.org/abs/1007.4256
Autor:
Woudt, P. A., Kilkenny, D., Zietsman, E., Warner, B., Loaring, N. S., Copley, C., Kniazev, A., Vaisanen, P., Still, M., Stobie, R. S., Burgh, E. B., Nordsieck, K. H., Percival, J. W., O'Donoghue, D., Buckley, D. A. H.
Publikováno v:
Mon.Not.Roy.Astron.Soc.371:1497-1502,2006
We report the serendipitous discovery of the Sloan Digital Sky Survey star, SDSS J160043.6+074802.9 to be a very rapid pulsator. The variation is dominated by a frequency near 8380 microHz (period = 119.33 s) with a large amplitude (0.04 mag) and its
Externí odkaz:
http://arxiv.org/abs/astro-ph/0607171
Publikováno v:
Astrophys.J. 609 (2004) 1018-1034
The Hanle effect has been proposed as a new diagnostic of circumstellar magnetic fields for early-type stars, for which it is sensitive to field strengths in the 1-300 G range. In this paper we compute the polarized P-Cygni line profiles that result
Externí odkaz:
http://arxiv.org/abs/astro-ph/0403416
Autor:
Nordsieck, K. H.
In this paper I will discuss new magnetic field diagnostics and instrumentation for an area of astrophysics where magnetic field observations have been difficult - circumstellar material. Such diagnostics would be particularly relevant to star format
Externí odkaz:
http://arxiv.org/abs/astro-ph/0106114
Autor:
Nordsieck, K. H., Wisniewski, J., Babler, B. L., Meade, M. R., Anderson, C. M., Bjorkman, K. S., Code, A. D., Fox, G. K., Johnson, J. J., Weitenbeck, A. J., Zellner, N. E. B., Lupie, O. L.
We report on new data, including four vacuum ultraviolet spectropolarimetric observations by the Wisconsin Ultraviolet Photo-Polarimeter Experiment ("WUPPE") on the Astro-1 (one observation) and Astro-2 (three observations) shuttle missions, and 15 n
Externí odkaz:
http://arxiv.org/abs/astro-ph/0102073
Autor:
Johnson, R. A., Nazé, Y., Panzera, T., Fullard, A. G., Lomax, J. R., Hoffman, J. L., Nordsieck, K. H.
Publikováno v:
Proceedings of the International Astronomical Union; May2024, Vol. 18 Issue S361, p502-504, 3p
Publikováno v:
ETSU Faculty Works.
Polarization has been detected at early times for all types of supernovae (SNe), indicating that all such systems result from or quickly develop some form of asymmetry. In addition, the detection of strong line polarization in SNe is suggestive of ch
Externí odkaz:
https://dc.etsu.edu/etsu-works/16677
Autor:
Johnson, R. A., Nazé, Y., Panzera, T., Fullard, A. G., Lomax, J. R., Hoffman, J. L., Nordsieck, K. H.
Publikováno v:
Proceedings of the International Astronomical Union; May2022, Vol. 18 Issue S361, p502-504, 3p