Zobrazeno 1 - 10
of 11
pro vyhledávání: '"U. J. Sofia"'
Autor:
U. J. Sofia, Edward B. Jenkins
Publikováno v:
The Astrophysical Journal. 499:951-965
We use the absorption features from neutral argon at 1048 and 1066 A to determine interstellar abundances or their lower limits toward nine early-type stars. These features were observed with the Interstellar Medium Absorption Profile Spectrograph (I
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::32d84f1656d42961aa3595e649af060f
https://doi.org/10.1086/305684
https://doi.org/10.1086/305684
Publikováno v:
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2013, 436, pp.2151-2169. 〈10.1093/mnras/stt1721〉
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2013, 436, pp.2151-2169. ⟨10.1093/mnras/stt1721⟩
Monthly Notices of the Royal Astronomical Society, 2013, 436, pp.2151-2169. ⟨10.1093/mnras/stt1721⟩
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2013, 436, pp.2151-2169. 〈10.1093/mnras/stt1721〉
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2013, 436, pp.2151-2169. ⟨10.1093/mnras/stt1721⟩
Monthly Notices of the Royal Astronomical Society, 2013, 436, pp.2151-2169. ⟨10.1093/mnras/stt1721⟩
The balloon-borne Solar Disk Sextant (SDS) experiment has measured the angular size of the Sun on seven occasions spanning the years 1992 to 2011. The solar half-diameter -- observed in a 100-nm wide passband centred at 615 nm -- is found to vary ove
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c88c0a2206d4efa612012a9437521f73
https://hal.archives-ouvertes.fr/hal-00864316
https://hal.archives-ouvertes.fr/hal-00864316
Publikováno v:
Astrophysics and Space Science. 239:315-360
The Interstellar Medium Absorption Profile Spectrograph (IMAPS) is an objectivegrating, echelle spectrograph built to observe the spectra of bright, hot stars over the spectral region 950–1150A, below the wavelength coverage of HST. This instrument
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9865c624e08261ec6d01b356809f7ac1
https://doi.org/10.1007/bf00645785
https://doi.org/10.1007/bf00645785
We report interstellar C II column densities or upper limits determined from weak absorption of the 2325.4029 A intersystem transition observed in six translucent sightlines with STIS. The sightlines sample a wide range of interstellar characteristic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e57f14c2c6c325e2c2fb9ed9cda365e9
Autor:
Berndt Klecker, John) Martin Laming, E. O. Flückiger, H. Kunow, F. Buclin, A. C. Cummings, U. J. Sofia, K.-P. Wenzel, J. W. Keller, Friedrich-Karl Thielemann, J. S. George, E. Salerno, M. Y. Hofer, E. C. Stone, C. Tranquille, D. Kirilova, E. R. Christian, M. E. Wiedenbeck, Volker Bothmer, Frank C. Jones
Publikováno v:
AIP Conference Proceedings.
We summarize the various methods and their limitations and strengths to derive galactic abundances from in-situ and remote-sensing measurements, both from ground-based observations and from instruments in space. Because galactic abundances evolve in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2b6f2cdba044b4fda3dbbe3a27818409
https://doi.org/10.1063/1.1434002
https://doi.org/10.1063/1.1434002
Autor:
U. J. Sofia
Publikováno v:
AIP Conference Proceedings.
Gas-phase (including ions and molecules) interstellar measurements of some elements can place tight constraints on their Galactic, or at least their total (gas+dust) local interstellar abundances. The interstellar medium within 1500pc of the Sun seem
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::23ce09974c6d0fa4213a19e347cac0af
https://doi.org/10.1063/1.1434003
https://doi.org/10.1063/1.1434003
Autor:
U. J. Sofia
Publikováno v:
New Extragalactic Perspectives in the New South Africa ISBN: 9789401066372
The majority of interstellar grain models are based on a dust population composed of carbon and silicate grains. Abundance studies using high-resolution absorption line spectra, however, suggest that other grain types, perhaps oxides or metal grains,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1b6726fe1513425fa5f2ff9f78e787ab
https://doi.org/10.1007/978-94-009-0335-7_82
https://doi.org/10.1007/978-94-009-0335-7_82
Autor:
U. J. Sofia, George Sonneborn, Todd M. Tripp, Roger Ferlet, Przemyslaw Wozniak, Alfred Vidal-Madjar, Edward B. Jenkins
Publikováno v:
Symposium - International Astronomical Union. 198:242-243
Observations with IMAPS demonstrate that interstellar atomic D/H abundance ratios differ by a factor of 3 on the sightlines toward Δ Ori A, ζ Pup, and γ2 Vel, early-type stars within ˜ 500 pc of the Sun. The observed D/H differences are not inver
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f1e72487deaf22b03eb6d7501571e42a
https://doi.org/10.1017/s0074180900166665
https://doi.org/10.1017/s0074180900166665
Autor:
U. J. Sofia, D. M. Meyer
Publikováno v:
The Astrophysical Journal. 558:L147-L147
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c8a142cb779e117a4a9cb66e2e3905bf
https://doi.org/10.1086/323609
https://doi.org/10.1086/323609
Autor:
D. M. Meyer, U. J. Sofia
Publikováno v:
Highlights of Astronomy. 11:397-397
Interstellar abundances studies can provide answers to some questions about stellar processes, and they can lead to new questions about others. We will discuss some recent interstellar abundance determinations and their implications for stellar studi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::196d32323f6108833aa83cc6306492de
https://doi.org/10.1017/s153929960002147x
https://doi.org/10.1017/s153929960002147x