Zobrazeno 1 - 10
of 415
pro vyhledávání: '"Verner, E."'
Publikováno v:
Astrophys.J. 629 (2005) 1034-1039
The very massive star, Eta Carinae, is enshrouded in an unusual complex of stellar ejecta, which is highly depleted in C and O, and enriched in He and N. This circumstellar gas gives rise to distinct absorption components corresponding to at least 20
Externí odkaz:
http://arxiv.org/abs/astro-ph/0505353
Publikováno v:
Astrophys.J. 624 (2005) 973-982
We focus on two Hubble Space Telescope/Space Telescope Imaging Spectrograph (HST/STIS) spectra of the Weigelt Blobs B&D, extending from 1640 to 10400A; one recorded during the 1998 minimum (March 1998) and the other recorded in February 1999, early i
Externí odkaz:
http://arxiv.org/abs/astro-ph/0502106
Publikováno v:
Astrophys.J. 620 (2005) 442-449
Using the high dispersion NUV mode of the Space Telescope Imaging Spectrograph (STIS) aboard the Hubble Space Telescope (HST) to observe Eta Carinae, we have resolved and identified over 500 sharp, circumstellar absorption lines of iron-group singly-
Externí odkaz:
http://arxiv.org/abs/astro-ph/0411147
Autor:
Corcoran, M. F., Hamaguchi, K., Gull, T., Davidson, K., Petre, R., Hillier, D. J., Smith, N., Damineli, A., Morse, J. A., Walborn, N. R., Verner, E., Collins, N., White, S., Pittard, J. M., Weis, K., Bomans, D., Butt, Y.
Publikováno v:
Astrophys.J. 613 (2004) 381-386
We report the first detection of X-ray emission associated with the Homunculus Nebula which surrounds the supermassive star Eta Carinae. The emission is characterized by a temperature in excess of 100 MK, and is consistent with scattering of the time
Externí odkaz:
http://arxiv.org/abs/astro-ph/0406180
Publikováno v:
Astrophys.J. 611 (2004) 780-785
The enrichment of Fe, relative to alpha-elements such as O and Mg, represents a potential means to determine the age of quasars and probe the galaxy formation epoch. To explore how \ion{Fe}{2} emission in quasars is linked to physical conditions and
Externí odkaz:
http://arxiv.org/abs/astro-ph/0404593
Autor:
Verner, E., Peterson, B. A.
Publikováno v:
Astrophys.J. 608 (2004) L85-L88
Interpretation of the \ion{Fe}{2}(UV)/\ion{Mg}{2} emission ratios from quasars has a major cosmological motivation. Both Fe and Mg are produced by short-lived massive stars. In addition, Fe is produced by accreting white dwarf supernovae somewhat aft
Externí odkaz:
http://arxiv.org/abs/astro-ph/0404531
Publikováno v:
Astrophys.J.592:L59-L62,2003
Both the Fe II UV emission in the 2000- 3000 A region [Fe II (UV)] and resonance emission line complex of Mg II at 2800 A are prominent features in quasar spectra. The observed Fe II UV/ Mg II emission ratios have been proposed as means to measure th
Externí odkaz:
http://arxiv.org/abs/astro-ph/0306533
Autor:
Baldwin, J. A., Crotts, A., Dufour, R. J., Ferland, G. J., Heathcote, S., Hester, J. J., Korista, K. T., Martin, P. G., O'Dell, C. R., Rubin, R. H., Tielens, A. G. G. M., Verner, D. A., Verner, E. M., Walter, D. K., Wen, Z.
We reexamine the spectroscopic underpinnings of recent suggestions that [O I] and [Fe II] lines from the Orion H II region are produced in gas where the iron-carrying grains have been destroyed and the electron density is surprisingly high. Our new o
Externí odkaz:
http://arxiv.org/abs/astro-ph/9607045
We list vacuum wavelengths, energy levels, statistical weights, transition probabilities and oscillator strengths for permitted resonance spectral lines of all ions of 18 astrophysically important elements (H through Si, S, Ar, Ca, Fe). Using a compi
Externí odkaz:
http://arxiv.org/abs/atom-ph/9604003
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