Zobrazeno 1 - 10
of 2 368
pro vyhledávání: '"Hillier, D J"'
Large spectroscopic surveys of individual massive stars, such as ULLYSES and XSHOOTU, provide observational data for hundreds of massive stars. Their analysis requires large numbers of synthetic spectra so that stellar parameters can be determined. I
Externí odkaz:
http://arxiv.org/abs/2408.10364
Autor:
Sander, A. A. C., Bouret, J. -C., Bernini-Peron, M., Puls, J., Backs, F., Berlanas, S. R., Bestenlehner, J. M., Brands, S. A., Herrero, A., Martins, F., Maryeva, O., Pauli, D., Ramachandran, V., Crowther, P. A., Gómez-González, V. M. A., Gormaz-Matamala, A. C., Hamann, W. -R., Hillier, D. J., Kuiper, R., Larkin, C. J. K., Lefever, R. R., Mehner, A., Najarro, F., Oskinova, L. M., Schösser, E. C., Shenar, T., Todt, H., ud-Doula, A., Vink, J. S.
Publikováno v:
A&A 689, A30 (2024)
CONTEXT: The spectral analysis of hot, massive stars is a fundamental astrophysical method to obtain their intrinsic properties and their feedback. Quantitative spectroscopy for hot, massive stars requires detailed numerical modeling of the atmospher
Externí odkaz:
http://arxiv.org/abs/2407.03137
Autor:
Martins, F., Bouret, J. -C., Hillier, D. J., Brands, S. A., Crowther, P. A., Herrero, A., Najarro, F., Pauli, D., Puls, J., Ramachandran, V., Sander, A. A. C., Vink, J. S., collaboration, the XshootU
Massive stars rotate faster, on average, than lower mass stars. Stellar rotation triggers hydrodynamical instabilities which transport angular momentum and chemical species from the core to the surface. Models of high-mass stars that include these pr
Externí odkaz:
http://arxiv.org/abs/2405.01267
Autor:
Crowther, Paul A, Barlow, M J, Royer, P, Hillier, D J, Bestenlehner, J M, Morris, P W, Wesson, R
We present Herschel PACS spectroscopy of the [O III] 88.4um fine-structure line in the nearby WC8+O binary system gamma Vel to determine its oxygen abundance. The critical density of this line corresponds to several 10^5 R* such that it is spatially
Externí odkaz:
http://arxiv.org/abs/2310.15170
Autor:
Damineli, A., Hillier, D. J., Navarete, F., Moffat, A. F. J., Weigelt, G., Corcoran, M. F., Gull, T. R., Richardson, N. D., Ho, T. P., Madura, T. I., Espinoza-Galeas, D., Hartman, H., Morris, P., Pickett, C. S., Stevens, I. R., Russell, C. M. P., Hamaguchi, K., Jablonski, F. J., Teodoro, M., McGee, P., Cacella, P., Heathcote, B., Harrison, K., Johnston, M., Bohlsen, T., Di Scala, G.
Eta Carinae ($\eta$\,Car) exhibits a unique set of P Cygni profiles with both broad and narrow components. Over many decades, the spectrum has changed -- there has been an increase in observed continuum fluxes and a decrease in FeII and HI emission l
Externí odkaz:
http://arxiv.org/abs/2211.01445
Autor:
Jones, C. E., Labadie-Bartz, J., Cotton, D. V., Nazé, Y., Peters, G. J., Hillier, D. J., Neiner, C., Richardson, N. D., Hoffman, J. L., Carciofi, A. C., Wisniewski, J. P., Gayley, K. G., Suffak, M. W., Ignace, R., Scowen, P. A.
Publikováno v:
Astrophysics and Space Science, Volume 367, Issue 12, article id.124, December 2022
UV spectroscopy and spectropolarimetry hold the key to understanding certain aspects of massive stars that are largely inaccessible with optical or longer wavelength observations. This is especially true for the rapidly-rotating Be and Bn stars, owin
Externí odkaz:
http://arxiv.org/abs/2111.07926
Publikováno v:
A&A 656, A61 (2021)
Following our recent work on Type II supernovae (SNe), we present a set of 1D nonlocal thermodynamic equilibrium radiative transfer calculations for nebular-phase Type Ibc SNe starting from state-of-the-art explosion models with detailed nucleosynthe
Externí odkaz:
http://arxiv.org/abs/2109.12350
Autor:
Damineli, A., Navarete, F., Hillier, D. J., Moffat, A. F. J., Corcoran, M. F., Gull, T. R., Richardson, N. D., Weigelt, G., Morris, P. W., Stevens, I.
Eta Carinae is a massive interacting binary system shrouded in a complex circumstellar environment whose evolution is the source of the long-term brightening observed during the last 80 years. An occulter, acting as a natural coronagraph, impacts obs
Externí odkaz:
http://arxiv.org/abs/2105.00590
We present HST/STIS observations and analysis of two prominent nebular structures around the central source of Eta Carinae, the knots C and D. The former is brighter than the latter for emission lines from intermediate or high ionization potential io
Externí odkaz:
http://arxiv.org/abs/2005.02139
Autor:
Mehner, A., de Wit, W. -J., Asmus, D., Morris, P. W., Agliozzo, C., Barlow, M. J., Gull, T. R., Hillier, D. J., Weigelt, G.
Publikováno v:
A&A 630, L6 (2019)
Eta Car is one of the most luminous and massive stars in our Galaxy and is the brightest mid-infrared (mid-IR) source in the sky, outside our solar system. Since the late 1990s the central source has dramatically brightened at ultraviolet and optical
Externí odkaz:
http://arxiv.org/abs/1908.09154