Search Publications
Influence of Active Regions on Solar Wind Characteristics at the Cycle Maximum
Reva, A. A.; Kirichenko, A. S.; Ulyanov, A. S. +2 more
Active regions (ARs) on the Sun are discussed as a possible source of the slow solar wind (SW) whose origin is still a subject of debates. In this paper we present experimental evidence for the possible influence of ARs on the SW speed and temperature near the maximum of solar cycle 23 (2000-2002). We have studied separately the characteristics of…
Cyclic changes in the interacting binary RX Cassiopeiae
Jurkovic, M. I.; Mennickent, R. E.; Djurašević, G. +6 more
We analyzed 109 years of published photometry and times of minima of the eclipsing interacting binary RX Cas. The inclusion of 171 previously unnoticed minima confirms the tendency of an increase in the orbital period at a rate of 1.84 s per cycle. We also find evidence of variations in the length of the previously reported long photometric cycle …
Ultraviolet to far infrared self-consistent analysis of the stellar populations of massive starburst galaxies at intermediate redshifts
Pérez-González, Pablo G.; Zamorano, Jaime; Espino-Briones, Néstor +1 more
We study in detail the properties of the stellar populations of 111 massive [log (M⋆/M⊙) ≥ 10] dusty [far-infrared (FIR)-selected] starburst (SFR/SFRMS > 2) galaxies at 0.7 < z < 1.2. For that purpose, we use self-consistent methods that analyse the UV-to-FIR broad-band observations in terms of the stellar…
Mass evaluation for red giant stars based on the spectroscopically determined atmospheric parameters
Takeda, Yoichi
The mass (
Spatially dependent photometric activity of M dwarfs in the solar cylinder
Wolf, Christian; Onken, Christopher A.; Chang, Seo-Won
We study the relationship between Galactic location (R, Z) and photometric activity for 3.6 million M dwarf stars within 1 kpc of the Sun. For this purpose, we identify 906 unique flare events as a proxy for magnetic activity from the SkyMapper Southern Survey Data Release 3. We adopt vertical distance |Z| from the Galactic disc as a proxy for age…
Studies of FCAPT UVBY photometry for the mCP stars HD 32966, HD 35298, HD 68292, HD 93226, HD 171247, HD 217833, HD 220147, and HD 223358
Adelman, Saul J.; Wittman, Todd; Dukes, Robert J., Jr.
We present differential Strömgren uvby observations from the Four College Automated Photometric Telescope (FCAPT) in Washington Camp, AZ of eight magnetic Chemically Peculiar (mCP) stars: HD 32966, HD 35298, HD 68292, HD 93226, HD 171247, HD 217833, HD 220147, and HD 223358. We use multiple period‑finding algorithms and incorporate data from the E…
HT Lyn and IR Lyn: Two Semi-detached-type Near-contact Binaries with Stable Orbital Period
Meng, Zi-Bin; Wang, Hong-Wei; Yu, Yun-Xia +2 more
We presented the first photometric and orbital period investigations for two near-contact binaries: HT Lyn and IR Lyn. The light-curves solutions derived from both our ground-based and various surveys' observations suggested that HT Lyn and IR Lyn are two semi-detached-type near-contact binaries with the secondary and primary components filling th…
Analysis of Emission Line Widths of [CII] 158µm
Samsonyan, A. L.
A study of [CII] 158 µm emission line profiles observed with Herschel PACS for 379 galaxies is presented. Emission line widths are compared to [CII] luminosities, to near-infrared 1.6 µm luminosities and to infrared 22 µm luminosities to decide if any luminosity relates to velocity dispersion. Archival data for [CII] fluxes and l…
When Do Stars Go Boom?
Cohen, Roger E.; Sabbi, Elena; Caiazzo, Ilaria +10 more
The maximum mass of a star that can produce a white dwarf (WD) is an important astrophysical quantity. One of the best approaches to establishing this limit is to search for WDs in young star clusters in which only massive stars have had time to evolve and where the mass of the progenitor can be established from the cooling time of the WD together…
A trio of giant planets orbiting evolved star HD 184010
Izumiura, Hideyuki; Sato, Bun'ei; Yoshida, Michitoshi +11 more
We report the discovery of a triple-giant-planet system around an evolved star HD 184010 (HR 7421, HIP 96016). This discovery is based on observations from Okayama Planet Search Program, a precise radial velocity survey, undertaken at Okayama Astrophysical Observatory between 2004 April and 2021 June. The star is K0 type and located at the beginni…