Zobrazeno 1 - 10
of 75
pro vyhledávání: '"S. J. Czyzak"'
Publikováno v:
Proceedings of the National Academy of Sciences. 82:2202-2206
Observations with the image tube scanner at the Shane 3-m telescope are combined with data obtained with the International Ultraviolet Explorer to assess the spectrum of the remarkable high-excitation planetary nebula NGC 6537. We have analyzed the s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4417bcf0f4c96859f4887d1d685df595
https://doi.org/10.1073/pnas.82.8.2202
https://doi.org/10.1073/pnas.82.8.2202
Autor:
S. J. Czyzak, Lawrence H. Aller
Publikováno v:
Astrophysics and Space Science. 62:397-437
Spectroscopic results are presented for most of the nebulae observed in a programme involving some forty planetaries measured with an image tube scanner at Lick Observatory and with a photo-electric spectrum scanner at Mt. Wilson Observatory. The spe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d4c73a1c09f313e175df42007bf69e2e
https://doi.org/10.1007/bf00645478
https://doi.org/10.1007/bf00645478
Autor:
C. P. Poirier, S. J. Czyzak
Publikováno v:
Astrophysics and Space Science. 116:21-37
For the forbidden transition of theCi sequence, the values obtained by several investigators are examined and reviewed. The differences and similarities in results obtained by several investigators are explained and are partly attributed to the metho
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5e2ecf22e1403d61cf59c70fe5a080ae
https://doi.org/10.1007/bf00649270
https://doi.org/10.1007/bf00649270
Publikováno v:
Astrophysics and Space Science. 64:347-357
NGC 4361 is an extremely high excitation, low-density, very inhomogeneous nebula. New spectroscopic data obtained with the Anglo-Australian telescope, together with published material, have been re-interpreted with the aid of theoretical nebular mode
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::db1e51212858d833380dbc96bd44d6ee
https://doi.org/10.1007/bf00639514
https://doi.org/10.1007/bf00639514
Autor:
S. J. Czyzak, Kenneth George Carpenter
Publikováno v:
Astrophysics and Space Science. 84:495-503
The IUE satellite observatory was used to obtain absolutely-calibrated emission line fluxes for diagnostic lines of multiply-ionized C, N, O, Si, Ne, and Ar which occur in the ultraviolet spectral region of planetary nebulae. These data, when combine
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bd08162f1d0a14af28c81b561dd8e7ee
https://doi.org/10.1007/bf00651328
https://doi.org/10.1007/bf00651328
Autor:
S. J. Czyzak, P. J. Malloy
Publikováno v:
Astrophysics and Space Science. 58:365-369
Transition probabilities were calculated for certain transitions in ZrII, ZrIII and SrI. For these allowed transitions Hartree-Fock wavefunctions were calculated for use in determining the absolute line strength. The methods developed by C. Froese-Fi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aa85b655b4dedde417b23d8e90e51007
https://doi.org/10.1007/bf00644523
https://doi.org/10.1007/bf00644523
Autor:
S. J. Czyzak, Lawrence H. Aller
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 188:229-240
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b8628a8ef402720019448ce97ab07b81
https://doi.org/10.1093/mnras/188.2.229
https://doi.org/10.1093/mnras/188.2.229
Autor:
S. J. Czyzak, T. K. Krueger
Publikováno v:
Astrophysics and Space Science. 60:99-117
Dipole lengths and dipole velocities have been determined for a series of transitions in N IV, O V and O VI. Some of these transitions are of astrophysical interest and the remainder were computed to give a more complete picture of the transitions in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6469ef63d5edb51fac4035062ce050ed
https://doi.org/10.1007/bf00648246
https://doi.org/10.1007/bf00648246
Publikováno v:
Astrophysics and Space Science. 68:335-346
Spectrophotometry of many regions within 30 Doradus in the Large Magellanic Cloud provides chemical abundances and densities for this nebular complex. The helium to hydrogen abundance ratio is about one-tenth by number and the heavier elements are un
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::845d234495b55a3af4f06a0a6b353526
https://doi.org/10.1007/bf00639703
https://doi.org/10.1007/bf00639703
Publikováno v:
Proceedings of the National Academy of Sciences. 74:5203-5206
Detailed line intensity measurements secured at Cerro Tololo Interamerican Observatory and corrected for interstellar extinction are presented for 19 HII regions in the Large Magellanic Cloud and 6 in the Small Magellanic Cloud. The elemental abundan
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6c07ded01ca564719521e64181132323
https://doi.org/10.1073/pnas.74.12.5203
https://doi.org/10.1073/pnas.74.12.5203