Zobrazeno 1 - 10
of 79
pro vyhledávání: '"Harriet L. Dinerstein"'
Autor:
Harriet L. Dinerstein
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 9 (2022)
I relate an anecdotal history of the beginnings of a new initiative in studies of the chemical composition of planetary nebulae: namely, investigating abundances of elements beyond the iron-peak through infrared spectroscopy. In some planetary nebula
Externí odkaz:
https://doaj.org/article/695d698c0ff04ce585909b4bd5164dd6
We present a comparative study of the near-infrared (NIR) H$_2$ line emission from five regions near hot young stars: Sharpless 140, NGC 2023, IC 63, the Horsehead Nebula, and the Orion Bar. This emission originates in photodissociation or photon-dom
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::632fbdb32904b5f6532efcbf9641cdf0
http://arxiv.org/abs/2108.08484
http://arxiv.org/abs/2108.08484
Publikováno v:
The Astronomical Journal. 164:185
Low- and intermediate-mass ($\rm 0.8~M_\odot < M < 8~M_\odot$) stars that evolve into planetary nebulae (PNe) play an important role in tracing and driving Galactic chemical evolution. Spectroscopy of PNe enables access to both the initial compositio
Publikováno v:
Smith, C, Zijlstra, A, Gesicki, K M & Dinerstein, H L 2017, ' Abundances in Galactic Bulge planetary nebulae from optical, ultraviolet and infrared observations ', Monthly Notices of the Royal Astronomical Society . https://doi.org/10.1093/mnras/stx1720
Iron suffers from high levels of depletion in the highly ionized environments of planetary nebulae, making the direct determination of undepleted elemental iron abundances difficult. Zinc, which does not suffer from the same depletion effects as iron
Autor:
F. Garzón, M. M. Rubio-Díez, Kyle F. Kaplan, Harriet L. Dinerstein, Nicholas C. Sterling, Jorge García-Rojas, S. Madonna, N. Castro-Rodriguez, Manuel A. Bautista
We have identified two new near-infrared emission lines in the spectra of planetary nebulae (PNe) arising from heavy elements produced by neutron capture reactions: [Te III] 2.1019 $\mu$m and [Br V] 1.6429 $\mu$m. [Te III] was detected in both NGC 70
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::18a717cdfa4768f06c72aca36449880a
Autor:
Gregory N. Mace, Daniel T. Jaffe, Soojong Pak, Heeyoung Oh, Michael D. Pavel, Hwihyun Kim, Sungho Lee, Jae Sok Oh, Chan Park, Kimberly R. Sokal, Kyle F. Kaplan, Harriet L. Dinerstein
We present a deep near-infrared spectrum of the Orion Bar Photodissociation Region (PDR) taken with the Immersion Grating INfrared Spectrometer (IGRINS) on the 2.7 m telescope at the McDonald Observatory. IGRINS has high spectral resolution (R~45000)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::91b305de235a54b0787ead13c7e56be3
We identify [Rb IV] 1.5973 and [Cd IV] 1.7204 micron emission lines in high-resolution (R=40,000) near-infrared spectra of the planetary nebulae (PNe) NGC 7027 and IC 5117, obtained with the IGRINS spectrometer on the 2.7-m telescope at McDonald Obse
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0fa9b8a5ebd7f3bd39a523ac0d29a022
http://arxiv.org/abs/1602.03188
http://arxiv.org/abs/1602.03188
Autor:
Brendan M. McLaughlin, P. H. Norrington, R. A. Phaneuf, R. C. Bilodeau, Seth Redfield, Harriet L. Dinerstein, D. A. Esteves, N. C. Sterling, A. L. D. Kilcoyne, A. Aguilar, Connor Ballance, Sehyun Hwang, M. C. Witthoeft, Manuel A. Bautista
Publikováno v:
Publications of the Astronomical Society of Australia. 26:339-344
Spectroscopy of planetary nebulae (PNe) provides the means to investigate s-process enrichments of neutron(n)-capture elements that cannot be detected in asymptotic giant branch (AGB) stars. However, accurate abundance determinations of these element
Publikováno v:
The Astrophysical Journal. 690:1130-1144
Type I planetary nebulae (PNe) have high He/H and N/O ratios and are thought to be descendants of stars with initial masses of approx. 3-8 Stellar Mass. These characteristics indicate that the progenitor stars experienced proton-capture nucleosynthes
Autor:
Harriet L. Dinerstein, N. C. Sterling
Publikováno v:
The Astrophysical Journal Supplement Series. 174:158-201
We present the results of a large-scale survey of neutron(n)-capture elements in Galactic planetary nebulae (PNe), undertaken to study enrichments from s-process nucleosynthesis in their progenitor stars. From new K-band observations of over 100 PNe