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Embedded clusters: upgrading visual and infrared photometric analysis with Gaia DR2 and ASteCA
Perren, G. I.; Vázquez, R. A.; Giorgi, E. E. +3 more
Embedded clusters are groups of stars which have not dispersed yet the residual of the parental cloud where they were born, thus getting precise distances and properties ofthese groups is an essential task. We present results for five embedded clusters: [DBS2003]5, [DBS2003]60, [DBS2003]98, [DBS2003]116 and [DBS2003]117, obtained from a combinatio…
V725 Sagittarii: Unique, Important, Neglected
Percy, J. R.
During the last century, V725 Sgr gradually changed from a 12-day Cepheid to an 85-day yellow semiregular giant. This paper presents wavelet analysis of AAVSO visual observations from 1982 to 2020, and Fourier analysis of ASAS-SN observations from 2016 to 2018. The results confirm that the previously-identified pulsation period has increased from …
Two close binaries across the hydrogen-burning limit in the Praesepe open cluster
Rebolo, R.; del Burgo, C.; Alvarez, C. +7 more
We present Keck I/OSIRIS and Keck II/NIRC2 adaptive optics imaging of two member candidates of the Praesepe stellar cluster (d = 186.18 ± 0.11 pc; 590-790 Myr), UGCS J08451066+2148171 (L1.5 ± 0.5) and UGCS J08301935+2003293 (no spectroscopic classification). We resolved UGCS J08451066+2148171 into a binary system in the near-infrared, with a K-ban…
The Reclassification of NSV 1586 from a Suspected Cepheid Star to a UG Class System
Hills, K.; Brincat, S. M.; Galdies, C. +1 more
On 2018 August 9, a contribution to the VSNET mailing list suggested that due to certain photometric attributes, NSV 1586 could possibly belong to the Dwarf Nova (DN) class. Hence, the initial classification of this star as a Cepheid variable star was put into question. This prompted the authors to investigate NSV 1586 in detail. The data obtained…
Havlen-Moffat #1, el cúmulo menos pensado
Morrell, N. I.; Gamen, R. C.; Giorgi, E. E. +1 more
The cluster Havlen-Moffat # 1 (HM1), in the constellation of Scorpius, owes its name to those who discovered it in 1977. They identified, spectroscopically, two Wolf-Rayet and two Of-type stars. HM1 is located in the fourth quadrant of the Milky Way where the absorption of the interstellar medium is significant. This work presents an analysis of t…
Detection of Periodicity in SiO Maser Intensity and Velocity Shift of the Symbiotic Star CH Cyg
Kim, Dong-Jin; Kim, Jaeheon; Cho, Se-Hyung +3 more
We performed simultaneous monitoring observations of H2O 616-523 and SiO V = 1, 2, $J=1\to $ 0, SiO V = 1, $J=2\to $ 1, $3\to 2$ maser lines toward the symbiotic star CH Cyg from 2012 December to 2019 November using the Korean very long baseline interferometry Network single-dish telescope. SiO V = 1, 2, $J=1\to 0$…
The kinematics of OB-stars and Cepheids based on Gaia DR2 catalogue
Pakhomova, P. V.
The purpose of the work was to study the kinematics and refine the distance scale of young objects of the galactic disk: OB stars and high-luminosity stars of late spectral classes, as well as Cepheids. We used the observational data obtained during the Gaia mission and published in the Gaia DR2 catalog. The statistical parallax method was used to…
STARHORSE photo-astrometricdistances, extinctions, and astrophysical parameters for Gaia DR2 stars
Anders, F.; Chiappini, C.; Santiago, B. X. +2 more
By combining the precise data delivered by Gaia DR2 with the photometric catalogues of PanSTARRS-1, 2MASS, and AllWISE, we recently derived Bayesian stellar parameters, distances, and extinctions for 265 million stars. The results are available to the community through the Gaia mirror at gaia.aip.de. We remind the community to pay attention to the…
Quasiperiodic Velocity Fluctuations in Eruptive Prominences Observed by AIA/SDO
Tsvetkov, Tsvetan; Petrov, Nikola
The current study presents an investigation of the behavior of prominences during eruptions. Variations in the distribution of their velocities are detected at altitudes <0.6 R⊙. Detailed analyses are carried out for 304 Å Solar Dynamics Observatory/Atmospheric Imaging Assembly (SDO/AIA) observations. To track the behavior of promine…
Features of Slow Sunspot Dissipation
Solov'ev, A. A.; Zhivanovich, I.
According to a model of sunspot dissipation through a thin boundary layer between the sunspot magnetic flux tube and the surrounding medium, the rate of decrease in the sunspot area must slow as the spot size decreases until it reaches a critical threshold at which the linear law of sunspot dissipation gives way to a nonlinear one. This theoretica…