David Branch, J. Bonnell, J. Tomkin,
... High-resolution near-infrared spectra of Mu Leonis, Alpha Arietis, Epsilon Virginis, and Delta Tauri, published equivalent widths for Alpha Bootis and the sun, and a grid of ...
Tópico(s): Astrophysics and Star Formation Studies
1978 - IOP Publishing | The Astrophysical Journal
E. F. Guinan, G. P. McCook, J. L. Fragola, W. C. O'Donnell, Grant Andrew, A.G. Weisenberger,
The 6.438 d RS CVn-type binary UX Ari was photoelectrically observed on 17 nights from October 1979 to February 1980. Using narrow- and intermediate-band interference filters centered near tne Balmer H-alpha line, the alpha index was formed from data yielding the net H-alpha line strength. The light curve formed from 6585 wavelength intermediate-band data was observed with an amplitude of 0.04 m, and minimum light occurring near the 0.87 phase. The value of the alpha index indicates H-alpha emission ...
Tópico(s): Solar and Space Plasma Dynamics
1981 - Institute of Physics | Publications of the Astronomical Society of the Pacific
Produção Nacional
Revisado por pares
Lorenza F. Barraza, R. L. Gomes, Y. S. Messias, I. C. Leão, L. A. Almeida, E. Janot-Pacheco, André Brito, F. A. C. Brito, Josias V. Santana, N. S. Gonçalves, Maria Liduína das Chagas, M. A. Teixeira, J. R. De Medeiros, B. L. Canto Martins,
... of different classes of rotational variables, composed of $\alpha^2$ Canum Venaticorum, rotating ellipsoidal and SX Arietis stars. The combination of the three techniques applied ...
Tópico(s): Astrophysics and Star Formation Studies
2022 - IOP Publishing | The Astrophysical Journal
... RS CVn-type variables HR 1099 and UX Arietis are presented and analyzed in terms of chromospheric models. Measurements of Mg h and k lines and Ca II H-K and H alpha spectra are indicated which are found not to ...
Tópico(s): Astronomical Observations and Instrumentation
1980 - IOP Publishing | The Astrophysical Journal
H. L. Nations, Lawrence W. Ramsey,
H-alpha line observations made during 1981 of the highly active RS CVn stars UX Ari, HR 1099, and BD +61 deg 1211 are presented and discussed. Excess H-alpha emission profiles derived by subtracting synthesized comparison-star spectra are analyzed to find that the UX Ari and HR 1099 systems differ significantly in the strength of the excess emission from their secondaries. Specifically, it is found that in UX Ari the H-alpha emission of the K subgiant completely dominates that of the G V secondary. ...
Tópico(s): Astronomy and Astrophysical Research
1986 - Institute of Physics | The Astronomical Journal
B. W. Bopp, Steven H. Saar, C. W. Ambruster, P. A. Feldman, Robert C. Dempsey, Morgan Allen, Samuel C. Barden,
... Main Sequence Stars; Stellar Activity; Emission Spectra; H Alpha Line; Line Spectra; Lithium; Magnetic Flux; Radial Velocity; Stellar Orbits; Ultraviolet Spectra; Astrophysics; STARS: BINARIES; STARS: CHROMOSPHERES; STARS: EMISSION-LINE; STARS: INDIVIDUAL HENRY DRAPER NUMBER: HD 17433; STARS: INDIVIDUAL CONSTELLATION NAME: VY ARIETIS; STARS: MAGNETIC; STARS: PRE--MAIN-SEQUENCE full text ...
Tópico(s): Astro and Planetary Science
1989 - IOP Publishing | The Astrophysical Journal
E. J. Weiler, M. Schmitz, D. A. Fraquelli, V. Piirola, M. Ryle, D. M. Gibson, F. N. Owen, B. W. Bopp, D. S. Hall,
... and radio observations of HR 1099 and UX Arietis. Weiler, E. J. ; Owen, F. N. ; Bopp, B. ... observations of the RS Canum Venaticorum binaries UX Arietis and HR 1099 are reported. The joint program ...
Tópico(s): Astronomical Observations and Instrumentation
1978 - IOP Publishing | The Astrophysical Journal
A. W. Shafter, Paula Szkody, James Liebert, W. R. Penning, Howard E. Bond, A. D. Grauer,
... Content Graphics Metrics Export Citation NASA/ADS TT ARIETIS : the low state. Shafter, A. W. ; Szkody, P. ; ...
Tópico(s): Astronomical Observations and Instrumentation
1985 - IOP Publishing | The Astrophysical Journal
David P. Huenemoerder, Derek L. Buzasi, Lawrence W. Ramsey,
Results are presented on 30 fiber-optic-echelle-CCD spectra for the UX Ari system, covering one orbit in the spring and two orbits in the fall of 1987. The spectra obtained have a resolution of about 12,000 over the range of the Ca II H lines in the near UV to the Ca II triplet in the near IR, covering several activity sensitive lines. The most striking features observed were strong H-alpha and H-beta absorption near phase 0.8, which were present at epochs eight months apart. The geometry of the ...
Tópico(s): Cardiovascular Disease and Adiposity
1989 - Institute of Physics | The Astronomical Journal
The very active RS CVn-type star UX Ari was observed using high-resolution echelle spectrograph attached to the 2.16m telescope of Xinglong station in Nov.-Dec. 2001 and Dec. 2002. By means of synthetic spectral subtraction method, the information about chromospheric activity of the system was obtained through several chromospheric activity indicators HeI D, and CaII IRT lines. Based on the analysis for these activity indicators, we found that the chromospheric activity of UX Ari showed obvious ...
Tópico(s): Astronomy and Astrophysical Research
2004 - Cambridge University Press | Proceedings of the International Astronomical Union