Zobrazeno 1 - 10
of 68
pro vyhledávání: '"Kwitter, K. B."'
The primary goal of this paper is to make a direct comparison between the measured and model-predicted abundances of He, C and N in a sample of 35 well-observed Galactic planetary nebulae (PN). All observations, data reductions, and abundance determi
Externí odkaz:
http://arxiv.org/abs/1708.08910
Autor:
Henry, R. B. C., Balick, B., Dufour, R. J., Kwitter, K. B., Shaw, R. A., Miller, T. R., Buell, J. F., Corradi, R. L. M.
The goal of the present study is twofold. First, we employ new HST/STIS spectra and photoionization modeling techniques to determine the progenitor masses of eight planetary nebulae (IC 2165, IC 3568, NGC 2440, NGC 3242, NGC 5315, NGC 5882, NGC 7662
Externí odkaz:
http://arxiv.org/abs/1510.01342
We present spectroscopy of nine planetary nebulae (PNe) in the outskirts of M31, all but one obtained with the 10.4m GTC telescope. These sources extend our previous study of the oxygen abundance gradient of M31 to galactocentric radii as large as 10
Externí odkaz:
http://arxiv.org/abs/1504.03869
We report deep long-slit emission-line spectra, the line flux ratios, and Doppler profile shapes of various bright optical lines. The low-ionization lines (primarily [N I], [O I], [S II], and [N II]) originate in shocked knots, as reported by many pr
Externí odkaz:
http://arxiv.org/abs/1409.2531
Autor:
Kwitter, K. B., Méndez, R. H., Peña, M., Stanghellini, L., Corradi, R. L. M., DeMarco, O., Fang, X., Henry, R. B. C., Karakas, A. I., Liu, X. -W., López, J. A., Manchado, A., Parker, Q. A.
We present a summary of current research on planetary nebulae and their central stars, and related subjects such as atomic processes in ionized nebulae, AGB and post-AGB evolution. Future advances are discussed that will be essential to substantial i
Externí odkaz:
http://arxiv.org/abs/1403.2246
We have obtained spectra of 16 planetary nebulae in the disk of M31 and determined the abundances of He, N, O, Ne, S and Ar. Here we present the median abundances and compare them with previous M31 PN disk measurements and with PNe in the Milky Way.
Externí odkaz:
http://arxiv.org/abs/1109.2943
Autor:
Kwitter, K. B., Henry, R. B. C.
We review gas-phase abundances in PNe and describe their dual utility as archives of original progenitor metallicity via the alpha elements, as well as sources of processed material from nucleosynthesis during the star's evolution, i.e., C, N, and s-
Externí odkaz:
http://arxiv.org/abs/1109.2502
Publikováno v:
Astrophysical Journal 711 (2010) 619-630
We present emission line strengths, abundances, and element ratios (X/O for Ne, S, Cl, and Ar) for a sample of 38 Galactic disk planetary nebulae (PNe) consisting primarily of Peimbert classification Type I. Spectrophotometry for these PNe incorporat
Externí odkaz:
http://arxiv.org/abs/1002.3606
We present new HST optical imagery as well as new UV and IR spectroscopic data obtained with the Hubble and Spitzer Space Telescopes, respectively, of the halo planetary nebula DdDm-1. For the first time we present a resolved image of this object whi
Externí odkaz:
http://arxiv.org/abs/0801.4781
We present ELSA, a new modular software package, written in C, to analyze and manage spectroscopic data from emission-line objects. In addition to calculating plasma diagnostics and abundances from nebular emission lines, the software provides a numb
Externí odkaz:
http://arxiv.org/abs/astro-ph/0605099