Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Laimons Začs"'
Autor:
Laimons Začs, Kārlis Puķı̄tis
Publikováno v:
The Astrophysical Journal, Vol 952, Iss 1, p 49 (2023)
Monitoring of high-resolution spectra in the optical and near-infrared wavelength region was carried out for the early post-AGB stage star IRAS Z02229+6208 with the CARMENES instrument to reveal spectroscopic variability over the pulsation cycle of 1
Externí odkaz:
https://doaj.org/article/18a47889b95f4a1fb1282eea7dab4242
Publikováno v:
The Astrophysical Journal, Vol 948, Iss 1, p 70 (2023)
Emission of carbon-bearing molecular lines in multiple optical spectra of IRAS 22272+5435 from 2015 to 2017 is detected, and, for the first time in post–asymptotic giant branch stars, real-time evolution of these features is observed. Specifically,
Externí odkaz:
https://doaj.org/article/217fe4508aef48b6ad23f010259e3f22
Publikováno v:
Astrophysics and Space Science. 365
The mass of the cool carbon star HD 54361 was suspected to be high, assuming the membership in the stellar association CMa OB1, in conflict with the theory of stellar evolution. The Gaia parallax and a high-resolution spectrum in the wavelength regio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::191bce18f33c47e85a69223005700a46
https://doi.org/10.1007/s10509-020-3739-1
https://doi.org/10.1007/s10509-020-3739-1
Publikováno v:
The Astrophysical Journal. 928:29
The evolutionary rate of the pulsating post–asymptotic giant branch (post-AGB) star HD 161796 was suspected to be high. Spectra of HD 161796 acquired during a time span of 18 yr are analyzed with the main goal of determining the evolutionary increa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fd6d10d4ecf5d35aa0e237fc15eb4546
https://doi.org/10.3847/1538-4357/ac4bc8
https://doi.org/10.3847/1538-4357/ac4bc8
Autor:
Laimons Začs, Kārlis Puķı̄tis
Publikováno v:
The Astrophysical Journal. 920:17
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0f8fc621cbbad8151d4f2b54810b2cdb
https://doi.org/10.3847/1538-4357/ac1671
https://doi.org/10.3847/1538-4357/ac1671
Autor:
Kārlis Puķı̄tis, Laimons Začs
Publikováno v:
Research Notes of the AAS. 5:8
We compared high-resolution spectra of Betelgeuse observed before and during the Great Dimming. Atomic lines are shallow and broad during the Great Dimming presumably because of molecular veiling and increased macroturbulence, ν macro ≳ 23 km s−
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ac94b7656ef86fedd67ace035c865426
https://doi.org/10.3847/2515-5172/abdaac
https://doi.org/10.3847/2515-5172/abdaac
Publikováno v:
Open Astronomy, Vol 21, Iss 4, Pp 399-420 (2012)
Element abundances for HD 209621 obtained earlier display significant discrepancies, especially in the case of CNO and neutron-capture elements. Therefore we performed a detailed analysis of chemical composition of this star using a new high-resoluti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d4c17855b18a00c68f12c2da42002d42
https://doi.org/10.1515/astro-2017-0399
https://doi.org/10.1515/astro-2017-0399
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 417:649-658
The results of local thermodynamic equilibrium (LTE) abundance analysis are presented for four red giants in the fields of open clusters NGC 1545 and Tr2. The membership of HD 27276, HD 27292 and HD 16068 was confirmed and the age of NGC 1545 was upd
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dc2293fd7eb86293f099dcdc29329846
https://doi.org/10.1111/j.1365-2966.2011.19309.x
https://doi.org/10.1111/j.1365-2966.2011.19309.x
Autor:
F. A. Musaev, Ting-Chang Yang, O. Smirnova, Julius Sperauskas, M. Schmidt, Wen Ping Chen, Laimons Začs
Publikováno v:
The Astrophysical Journal. 695:L203-L207
Radial velocity monitoring of the star HD 235858 confirmed regular variations with a peak-to-peak amplitude of about 10 km s–1 and a period of about 131.2 days. The light, color, and velocity variations are typical for RV Tauri stars. Splitting of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6e9e9613cafb73b7e7ac69b25dbf244d
https://doi.org/10.1088/0004-637x/695/2/l203
https://doi.org/10.1088/0004-637x/695/2/l203
Autor:
F. A. Musaev, Julius Sperauskas, Yakiv V. Pavlenko, Bruce J. Hrivnak, B. M. Kaminsky, Aija Grankina, Laimons Začs
A time series of high-resolution spectra was observed in the optical wavelength region for the bright proto-planetary nebula IRAS22272+5435 (HD235858), along with a simultaneous monitoring of its radial velocity and $BVR_C$ magnitudes. The object is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::32b2e6e8d9f86ca66670368fd5b338be
http://arxiv.org/abs/1511.03450
http://arxiv.org/abs/1511.03450
