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Pregled bibliografske jedinice broj: 352289

Časopis

Autori: Jurkić, Tomislav; Sarta Deković, Mariza; Kotnik-Karuza, Dubravka; Dominis-Prester, Dijana
Naslov: Atmospheric parameters of the B-supergiant HD 198478 from the UV spectra
Izvornik: Astrophysics and space science (0004-640X) 335 (2011), 1; 113-120
Vrsta rada: članak
Ključne riječi: line: profiles; stars: fundamental parameters; stars: supergiants; techniques: spectroscopic; ultraviolet: stars
Sažetak:
We determined atmospheric parameters of the Galactic early B-supergiant HD198478 (55 Cyg) from the UV silicon lines taken from the high-resolution 1150-1980 angstrems IUE spectra. TLUSTY numerical code was used to model the stellar atmosphere and to determine the temperature and surface gravity assuming a non-LTE plane parallel hydrostatic stellar atmosphere with microturbulence. The synthesized spectra were broadened by the IUE instrumental profile, rotational and macroturbulent velocity with ROTIN numerical code. The silicon 1264, 1309, 1312, 1417 and 1294-1303 angstrems multiplet lines of different stages of ionization (Si II and Si III) were modeled, leading to the temperature, surface gravity, rotational and macroturbulent velocity values. Our results have shown that the line broadening cannot be explained by rotational velocity only, but additional macroturbulent velocity component should be taken into account. HD 198478 shows a significant degeneracy in velocity, which means that the individual contributions of the macroturbulence and rotation in the total velocity broadening cannot be distinguished. Adequate fit of TLUSTY models to the observed non-resonant silicon lines suggests that the non-LTE plane-parallel hydrostatic stellar model without wind contribution can be used to explain such lines. We have obtained similar results using the HST STIS spectra in the same procedure, showing that the IUE spectra, despite their lacking quality compared to the STIS spectra, are reliable enough in determination of the B supergiants' photospheric parameters.
Projekt / tema: 316-0000000-2824
Izvorni jezik: ENG
Rad je indeksiran u
bazama podataka:
Current Contents Connect (CCC)
Scopus
SCI-EXP, SSCI i/ili A&HCI
Science Citation Index Expanded (SCI-EXP) (sastavni dio Web of Science Core Collectiona)
Kategorija: Znanstveni
Znanstvena područja:
Fizika
URL Internet adrese: http://www.springerlink.com/content/dq2612m0w8t10438/
Broj citata:
Altmetric:
DOI: 10.1007/s10509-011-0637-6
URL cjelovitog teksta:
Google Scholar: Atmospheric parameters of the B-supergiant HD 198478 from the UV spectra
Upisao u CROSBI: tjurkic@ffri.hr (tjurkic@ffri.hr), 12. Svi. 2008. u 18:34 sati



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