Zobrazeno 1 - 10
of 3 968
pro vyhledávání: '"Hubeny I."'
Autor:
García, A. Perdomo, Vitas, N., Khomenko, E., Collados, M., Prieto, C. Allende, Hubeny, I., Osorio, Y.
Publikováno v:
A&A 675, A160 (2023)
Context. Realistic 3D time-dependent simulations of stellar near-surface convection employ the opacity binning method for efficient and accurate computation of the radiative energy exchange. The method provides several orders of magnitude of speed-up
Externí odkaz:
http://arxiv.org/abs/2306.03744
Autor:
Calamida, A., Matheson, T., Olszewski, E. W., Saha, A., Axelrod, Tim, Shanahan, C., Holberg, J., Points, S., Narayan, G., Malanchev, K., Ridden-Harper, R., Gentile-Fusillo, N., Raddi, R., Bohlin, R., Rest, A., Hubeny, I., Deustua, S., Mackenty, . J., Sabbi, E., Stubbs, C. W.
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:
http://arxiv.org/abs/2209.09950
Publikováno v:
Proc. IAU 18 (2022) 485-489
We report on a study of 9 nearby star-forming, very low-metallicity galaxies observed by Hubble's COS far-UV spectrograph that can serve as templates of high-z galaxies to be observed by JWST. We find that the nebular spectra of these primitive galax
Externí odkaz:
http://arxiv.org/abs/2207.04553
The Ca~II H \& K lines are among the few features available to infer the metallicity of extremely metal-poor stars from medium-resolution spectroscopy. Unfortunately, these lines can overlap with absorption produced in the intervening interstellar me
Externí odkaz:
http://arxiv.org/abs/2203.01257
Autor:
Braganca, G. A., Daflon, S., Lanz, T., Cunha, K., Bensby, T., McMillan, P. J., Garmany, C. D., Glaspey, J. W., Fernandes, M. Borges, Oey, M. S., Hubeny, I.
Publikováno v:
A&A 625, A120 (2019)
Using a sample of 31 main-sequence OB stars located between galactocentric distances 8.4 - 15.6 kpc, we aim to probe the present-day radial abundance gradients of the Galactic disk. The analysis is based on high-resolution spectra obtained with the M
Externí odkaz:
http://arxiv.org/abs/1904.04340
Autor:
Calamida, A., Matheson, T., Saha, A., Olszewski, E., Narayan, G., Claver, J., Shanahan, C., Holberg, J., Axelrod, T., Bohlin, R., Stubbs, C. W., Deustua, S., Hubeny, I., Mackenty, J., Points, S., Rest, A., Sabbi, E.
We present precise photometry and spectroscopy for 23 candidate spectrophotometric standard white dwarfs. The selected stars are distributed in the Northern hemisphere and around the celestial equators and are all fainter than r ~ 16.5 mag. This netw
Externí odkaz:
http://arxiv.org/abs/1812.00034
The gas kinetic temperature ($T_K$) of various interstellar environments is often inferred from observations that can deduce level populations of atoms, ions, or molecules using spectral line observations; H I 21 cm is perhaps the most widely used wi
Externí odkaz:
http://arxiv.org/abs/1706.01425
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 470, Issue 3, 21 September 2017, Pages 3532-3556
We combine state-of-the-art models for the production of stellar radiation and its transfer through the interstellar medium (ISM) to investigate ultraviolet-line diagnostics of stars, the ionized and the neutral ISM in star-forming galaxies. We start
Externí odkaz:
http://arxiv.org/abs/1705.10320
Autor:
Pala, A. F., Gänsicke, B. T., Townsley, D., Boyd, D., Cook, M. J., De Martino, D., Godon, P., Haislip, J. B., Henden, A. A., Hubeny, I., Ivarsen, K. M., Kafka, S., Knigge, C., LaCluyze, A. P., Long, K. S., Marsh, T. R., Monard, B., Moore, J. P., Myers, G., Nelson, P., Nogami, D., Oksanen, A., Pickard, R., Poyner, G., Reichart, D. E., Perez, D. Rodriguez, Schreiber, M. R., Shears, J., Sion, E. M., Stubbings, R., Szkody, P., Zorotovic, M.
Publikováno v:
MNRAS, Volume 466, pages 2855-2878 (2017)
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_
Externí odkaz:
http://arxiv.org/abs/1701.02738
To calculate realistic models of objects with Ni in their atmospheres, accurate atomic data for the relevant ionization stages needs to be included in model atmosphere calculations. In the context of white dwarf stars, we investigate the effect of ch
Externí odkaz:
http://arxiv.org/abs/1610.09662