Zobrazeno 1 - 10
of 286
pro vyhledávání: '"Ivan Hubeny"'
Autor:
Tim Axelrod, Abhijit Saha, Thomas Matheson, Edward W. Olszewski, Ralph C. Bohlin, Annalisa Calamida, Jenna Claver, Susana Deustua, Jay B. Holberg, Ivan Hubeny, John W. Mackenty, Konstantin Malanchev, Gautham Narayan, Sean Points, Armin Rest, Elena Sabbi, Christopher W. Stubbs
Publikováno v:
The Astrophysical Journal, Vol 951, Iss 1, p 78 (2023)
Hot DA white dwarfs (DAWDs) have fully radiative pure hydrogen atmospheres that are the least complicated to model. Pulsationally stable, they are fully characterized by their effective temperature T _eff and surface gravity $\mathrm{log}\,g$ , which
Externí odkaz:
https://doaj.org/article/b6eb1350c6b34f49ba29ec75e9eed043
An accurate tabulation of stellar brightness in physical units is essential for a multitude of scientific endeavors. The HST/CALSPEC database of flux standards contains many stars with spectral coverage in the 0.115--1 \micron\ range with some extens
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::56c990a35bb6b38fbfc4c149ea4d900e
Autor:
Annalisa Calamida, Thomas Matheson, Edward W. Olszewski, Abhijit Saha, Tim Axelrod, Clare Shanahan, Jay Holberg, Sean Points, Gautham Narayan, Konstantin Malanchev, Ryan Ridden-Harper, Nicola Gentile-Fusillo, Roberto Raddi, Ralph Bohlin, Armin Rest, Ivan Hubeny, Susana Deustua, John Mackenty, Elena Sabbi, Christopher W. Stubbs
We verified for photometric stability a set of DA white dwarfs with Hubble Space Telescope magnitudes from the near-ultraviolet to the near-infrared and ground-based spectroscopy by using time-spaced observations from the Las Cumbres Observatory netw
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ff9bb4c0240bfa8118fe5f00ac2f5f3b
Autor:
Thomas Gomez, Taisuke Nagayama, Mark Zammit, Chris Fontes, Dave Kilcrease, Patricia Cho, Bart Dunlap, Michael Montgomery, Donald Winget, Igor Bray, Ivan Hubeny
Publikováno v:
Proposed for presentation at the APS DPP held November 8-12, 2021 in Virtual.
Autor:
Bart Dunlap, Michael Montgomery, Patricia Cho, Bryce Hobbs, Thomas Gomez, Marc-Andre Schaeuble, Taisuke Nagayama, James Bailey, Sonal Patel, Patrick Dufour, Ivan Hubeny, Donald Winget
Publikováno v:
Proposed for presentation at the Z Fundamental Science Workshop held August 9-10, 2021 in Albuquerque, NM..
Autor:
Knox S. Long, Ivan Hubeny
The spectra arising from the disks of nova-like variables show many of the features seen in stellar atmospheres. They are typically modelled either from an appropriated weighted set of stellar atmospheres or a disk atmosphere with energy is dissipate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3cc3ce7fe7aa269c3481cc8c7afaea5f
Context.Relaxing the assumption of local thermodynamic equilibrium (LTE) in modelling stellar spectra is a necessary step to determine chemical abundances to better than about 10% in late-type stars.Aims.We describe our multi-element (Na, Mg, K, and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::65547323e93a77500a3fae81e7893c17
http://arxiv.org/abs/2003.13353
http://arxiv.org/abs/2003.13353
Autor:
Grégoire Guillon, John F. Kielkopf, Roberto Linguerri, Majdi Hochlaf, Siyi Xu, Ivan Hubeny, Muneerah Mogren Al Mogren, N. F. Allard, Bilel Mehnen
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, 2020, 494 (1), pp 868-875. ⟨10.1093/mnras/staa707⟩
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2020, 494 (1), pp 868-875. ⟨10.1093/mnras/staa707⟩
The spectra of helium-dominated white dwarf stars with hydrogen in their atmosphere present a distinctive broad feature centered around 1160~\AA\/ in the blue wing of the Lyman-$\alpha$ line. It is extremely apparent in WD 1425+540 recently observed
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::22ee61b9fa072c7d89793f5fa9df6725
https://hal.archives-ouvertes.fr/hal-02986812
https://hal.archives-ouvertes.fr/hal-02986812
Autor:
Ivan Hubeny, Fernand Spiegelman, Thierry Leininger, Nicole F. Allard, Luis Welbanks, Nikku Madhusudhan
Publikováno v:
The Astrophysical journal letters
The Astrophysical journal letters, Bristol : IOP Publishing, 2019, 887 (1), pp.L20. ⟨10.3847/2041-8213/ab5a89⟩
The Astrophysical journal letters, Bristol : IOP Publishing, 2019, 887 (1), pp.L20. ⟨10.3847/2041-8213/ab5a89⟩
Atmospheric compositions can provide powerful diagnostics of formation and migration histories of planetary systems. We investigate constraints on atmospheric abundances of H$_2$O, Na, and K, in a sample of transiting exoplanets using latest transmis
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4f6452fb01abffb386ae085aef4aa8eb
http://arxiv.org/abs/1912.04904
http://arxiv.org/abs/1912.04904
Autor:
Paula Szkody, Matthias R. Schreiber, Dean M. Townsley, Peter Nelson, D. de Martino, Anna F. Pala, Daisaku Nogami, Christian Knigge, Knox S. Long, D. Rodriguez Perez, M. J. Cook, K. M. Ivarsen, B. Monard, Tom Marsh, Edward M. Sion, Arto Oksanen, Patrick Godon, J. B. Haislip, Rod Stubbings, Jeremy Shears, Monica Zorotovic, Daniel E. Reichart, J. P. Moore, Ivan Hubeny, A. A. Henden, Roger D. Pickard, Aaron P. LaCluyze, S. Kafka, David Boyd, Gary Poyner, G. Myers, Boris T. Gänsicke
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 466:2855-2878
We present HST spectroscopy for 45 cataclysmic variables (CVs), observed with HST/COS and HST/STIS. For 36 CVs, the white dwarf is recognisable through its broad Ly$\alpha$ absorption profile and we measure the white dwarf effective temperatures ($T_