Zobrazeno 1 - 10
of 41
pro vyhledávání: '"Julius Sperauskas"'
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
Autor:
Griet C. Van de Steene, Bruce J. Hrivnak, Hans Van Winckel, Julius Sperauskas, David Bohlender
Publikováno v:
Galaxies, Vol 6, Iss 4, p 131 (2018)
Light, color, and radial velocity data (2007–2015) for HD 161796, V887 Her, and HD 331319, three oxygen-rich post-AGB stars, have thus far not provided direct support for the binary hypothesis to explain the shapes of planetary nebulae and severely
Externí odkaz:
https://doaj.org/article/da84ecf8013f447fb2726fb9d8c64679
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
Autor:
Julius Sperauskas, Wenxian Lu, Griet C. Van de Steene, David A. Bohlender, Hans Van Winckel, Bruce J. Hrivnak
Publikováno v:
Proceedings of the International Astronomical Union. 12:218-222
We present the results of a long-term search (25 yrs) for radial velocity variability in a sample of seven bright proto-planetary nebulae showing axial symmetry. They all vary in velocity due to periodic pulsations. However, only marginal evidence is
We observed stars with variable radial velocities to determine their spectroscopic orbits. Velocities of 132 targets taken over a time span reaching 30 years are presented. They were measured with the correlation radial velocity spectrometers (1913 v
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::072a8b6b49263bb74433cee4a7b87012
http://arxiv.org/abs/1904.06544
http://arxiv.org/abs/1904.06544
Autor:
David A. Bohlender, Hans Van Winckel, Griet C. Van de Steene, Bruce J. Hrivnak, Julius Sperauskas
Publikováno v:
Galaxies, Vol 6, Iss 4, p 131 (2018)
Galaxies
Volume 6
Issue 4
Galaxies, Basel : MDPI, 2018, vol. 6, no. 4, art. no. 131, p. [1-5]
Galaxies
Volume 6
Issue 4
Galaxies, Basel : MDPI, 2018, vol. 6, no. 4, art. no. 131, p. [1-5]
Light, color, and radial velocity data (2007–2015) for HD 161796, V887 Her, and HD 331319, three oxygen-rich post-AGB stars, have thus far not provided direct support for the binary hypothesis to explain the shapes of planetary nebulae and severely
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::83955b72cc697804202df14bf0798f44
https://lirias.kuleuven.be/handle/123456789/632716
https://lirias.kuleuven.be/handle/123456789/632716
We have obtained contemporaneous light, color, and radial velocity data for three proto-planetary nebulae (PPNe) over the years 2007 to 2015. The light and velocity curves of each show similar periods of pulsation, with photometric periods of 42 and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e3d4af3e982ab8dfe547cd6f45609cad
http://arxiv.org/abs/1810.13037
http://arxiv.org/abs/1810.13037
Autor:
Wenxian Lu, Hans Van Winckel, David A. Bohlender, Bruce J. Hrivnak, Griet C. Van de Steene, Julius Sperauskas
We present the results of an expanded, long-term radial velocity search (25 yrs) for evidence of binarity in a sample of seven bright proto-planetary nebulae (PPNe). The goal is to investigate the widely-held view that the bipolar or point-symmetric
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::41d34ba4cb005c4b7f930aa47ecd7e4d
https://nrc-publications.canada.ca/eng/view/object/?id=e7644cba-9797-40a1-8a82-e6a1e6bf97d9
https://nrc-publications.canada.ca/eng/view/object/?id=e7644cba-9797-40a1-8a82-e6a1e6bf97d9
Publikováno v:
New Astronomy. 19:34-41
We present Stromvil photometry and radial-velocity measurements of the brightest ( V 12 mag) stars in the region of the suspected open cluster Dol–Dzim 5. The long-term radial-velocity monitoring has revealed that one of the stars, BD + 38 ° 2777
Publikováno v:
Open Astronomy, Vol 21, Iss 3, Pp 387-396 (2012)
We have used the Simbad database and VizieR catalogue access tools to construct the observational color-absolute magnitude diagrams of nearby K-M dwarfs with precise Hipparcos parallaxes (\sigma_\pi/\pi < 0.05). Particular attention has been paid to