Výsledky vyhledávání - "I. J. Danziger"

Globular cluster kinematics and X-ray emission in the early-type galaxy NGC 1399

Publikováno v: Astronomy & Astrophysics. 458:79-88

Context. Of the various observational methods used to address the question of dark matter in early-type galaxies there is the possibility of spatial overlap in using kinematics of stars, clusters and X-ray halos. Aims. To investigate methods for the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::28d83ee409eb42fa5a677c889fe5059e
https://doi.org/10.1051/0004-6361:20065017

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Observations and analysis of two type IIP supernovae: the intrinsically faint object SN 2005cs and the ambiguous object SN 2005ay

Autor: I. J. Danziger, S. A. Korotkiy, D. Yu. Tsvetkov, A. Elmhamdi, A. Volnova, M. V. Ereshko, A. P. Shulga

Publikováno v: Astronomy & Astrophysics. 460:769-776

Aims: To derive observational properties and physical parameters of the progenitor stars of type IIP supernovae SN 2005ay and SN 2005cs from their U,B,V,R,I CCD photometry, and to define their velocity behaviour. Methods: Light curves are analysed, a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::396855677069a1b5d5633a6eb8010a37
https://doi.org/10.1051/0004-6361:20065704

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Hydrogen and helium traces in type Ib-c supernovae

Autor: I. J. Danziger, E. Baron, Robert P. Kirshner, A. Elmhamdi, Bruno Leibundgut, David Branch

Publikováno v: Astronomy & Astrophysics. 450:305-330

The spectroscopic properties of a selected optical photospheric spectra of core collapse supernovae (CCSNe) are investigated.Special attention is devoted to traces of hydrogen at early phases. The generated spectra are found to match the observed one

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6a50d8c22dcd95c6f0a807a34e57fb20
https://doi.org/10.1051/0004-6361:20054366

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The progenitor of SN 2005cs in the Whirlpool Galaxy

Autor: I. J. Danziger, S. J. Smartt, Justyn R. Maund

Publikováno v: Monthly Notices of the Royal Astronomical Society: Letters. 364:L33-L37

The progenitor of SN 2005cs, in the galaxy M51, is identified in pre-explosion HST ACS WFC imaging. Differential astrometry, with post-explosion ACS HRC F555W images, permitted the identification of the progenitor with an accuracy of 0.006". The prog

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::58d0b3727e7738dcc22cdd61abe7fa80
https://doi.org/10.1111/j.1745-3933.2005.00100.x

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SN Ib 1990I: Clumping and dust in the ejecta?

Autor: Massimo Turatto, M. Della Valle, Enrico Cappellaro, Mark M. Phillips, A. Elmhamdi, C. Gouiffes, I. J. Danziger

Publikováno v: Astronomy & Astrophysics. 426:963-977

Photometry and spectra of the type Ib SN 1990I are presented and analysed, covering about 400 days of evolution. The presence of optical helium lines is shown. SN 1990I seems to show higher velocities compared to a sample of type Ib events. The nebul

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::471d57bc2fd8075653abc9f6e3b8ba91
https://doi.org/10.1051/0004-6361:20041318

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A deep survey of heavy element lines in planetary nebulae - II. Recombination-line abundances and evidence for cold plasma

Autor: X.-W. Liu, M. J. Barlow, P. J. Storey, I. J. Danziger, Y. G. Tsamis

Publikováno v: Monthly Notices of the Royal Astronomical Society. 353:953-979

[Abridged] Deep optical observations of the spectra of 12 Galactic planetary nebulae (PNe) and 3 Magellanic Cloud PNe were presented in Paper I by Tsamis et al. (2003b), who carried out an abundance analysis using the collisionally excited forbidden

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fb4535d611adc2bc19cf8a7f22e1379a
https://doi.org/10.1111/j.1365-2966.2004.08140.x

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Me 1-1: A PN containing a cool star

Autor: I. J. Danziger, Z.-X. Shen, X.-W. Liu

Publikováno v: Astronomy & Astrophysics. 422:563-572

We report the detection of a cool stellar component at the center of the planetary nebula (PN) Me 1-1 and present optical spectra of the system. From measurements of nebular emission lines, we have derived electron temperature, density and chemical c

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b6430dcd5a41006c26ddbb37aaa86550
https://doi.org/10.1051/0004-6361:20040195

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A massive circumstellar envelope around the type-IIn supernova SN 1995G

Autor: I. J. Danziger, N. N. Chugai

Publikováno v: Astronomy Letters. 29:649-657

We model the interaction of the supernova SN 1995G with a dense circumstellar (CS) gas in a thin shell approximation. A model fit of the observed bolometric light curve combined with data on the supernova expansion velocity provides an estimate of th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a35372a82e4bef0c89997299ae915918
https://doi.org/10.1134/1.1615333

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A deep survey of heavy element lines in planetary nebulae - I. Observations and forbidden-line densities, temperatures and abundances

Autor: Y. G. Tsamis, P. J. Storey, M. J. Barlow, I. J. Danziger, X.-W. Liu

Publikováno v: Monthly Notices of the Royal Astronomical Society. 345:186-220

We present spectrophotometry of 12 Galactic and 3 Magellanic Cloud planetary nebulae (PNe). Nine of the Galactic PNe were observed by scanning the slit across the PN. We use the fluxes of collisionally excited lines (CELs) to derive electron densitie

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a52e220566465cfba9c8c9969dc7138c
https://doi.org/10.1046/j.1365-8711.2003.06972.x

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