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The Digitized First Byurakan Survey Data Base. Late-Type Stars Candidates. New Confirmations. I
Gigoyan, K. K.; Gigoyan, K. S.; Kostandyan, G. R. +3 more
The Digitized First Byurakan Survey (DFBS) is the digitized version of the First Byurakan Survey (FBS, or Markarian survey). The FBS was the first systematic survey of the extragalactic sky. This objective-prism survey was carried out in 1965-1980 by B.E.Markarian and his colleagues using the 1 m Schmidt telescope of the Byurakan Astrophysical Obs…
First detailed study of two eccentric eclipsing binaries: TYC 5378-1590-1 and TYC 8378-252-1
Zasche, P.; Marang, F.; Erdem, A. +2 more
Aims: The analysis of combined photometry and spectroscopy of eccentric eclipsing binary systems facilitates the derivation of very precise values for a large ensemble of physical parameters of the component stars and their orbits, thereby providing stringent tests of theories of stellar structure and evolution. In this paper two eccentric ec…
GD 99: Re-investigation of an old ZZ Ceti companion
Sódor, Á.; Bognár, Zs.; Mező, Gy.
Context. Thanks to photometric space missions, we have access to more and more information on the properties of white dwarf stars, especially pulsating ones. In the case of pulsators, we have the opportunity to get an insight into their otherwise hidden interiors by the means of asteroseismology. In addition to space-based observations, we also ta…
Evolution of the truncation radius in GX 339-4 from XMM-Newton spectral timing
Chainakun, P.; Young, A. J.; O'Mathúna, B. +1 more
We investigate the changing geometry of the accretion disc in the X-ray binary GX 339-4 using a combination of spectral and timing models to fit six XMM-Newton observations taken during the end of the 2015 X-ray outburst. We use progressively more complex models of the X-ray reflection spectra, from simple disc lines to full relativistic reflectio…
Analysis of the B-stars in field of the solar neighborhood young open cluster IC 2391 using UVES spectra and Gaia DR3
Hendy, Y. H. M.; El-Depsey, M. H.; Shokry, Ahmed +2 more
In this paper, we present the stellar parameters of individual B-type stars in the IC 2391 young open cluster, using the Barbier-Chalonge-Divan (BCD) Spectrophotometry System, to obtain stellar fundamental parameters from direct measurements of the Balmer discontinuity. This method is optimally suited for late B-stars to determine stellar fundamen…
Solar-like oscillations in γ Cephei A as seen through SONG and TESS. A seismic study of γ Cephei A
Grundahl, F.; Knudstrup, E.; Lund, M. N. +11 more
Context. Fundamental stellar parameters such as mass and radius are some of the most important building blocks in astronomy, both when it comes to understanding the star itself and when deriving the properties of any exoplanet(s) they may host. Asteroseismology of solar-like oscillations allows us to determine these parameters with high precision.…
Interaction of a high-mass X-ray binary with the interstellar medium through stellar wind. The case of GX 301-2
Chaty, S.; Marchioro, J.; Coleiro, A. +2 more
Context. GX 301-2 is a high-mass X-ray binary (HMXB) with strong stellar outflows. The evolution of these binaries can be closely related with the interstellar environment due to strong wind interactions.
Aims: We try to constrain the energy injected in the interstellar medium by GX 301-2 through stellar wind using HAWK-I and Herschel data. <…
Determination of the Parameters of a Nonlinear Kinematic Galactic Rotation Model Based on the Proper Motions and Radial Velocities of Stars from the Gaia DR3 Catalogue
Tsvetkov, A. S.; Amosov, F. A.
We have solved the Ogorodnikov-Milne stellar-kinematics equations in the Galactic rectangular coordinate system based on the total velocities for a special sample of stars with radial velocities from the final Gaia Data Release 3 catalogue. We have found the region of applicability of the linear model and the regions that it describes poorly. We h…
Frequency analysis of the hybrid δ Sct-γ Dor star CoRoT-102314644
Creevey, O. L.; Pichon, B.; Sánchez Arias, J. P. +1 more
Context. Observations from space missions allowed significant progress due to the absence of atmospheric noise contributions and having uninterrupted data sets. This has been extremely beneficial in asteroseismology because many oscillation frequencies, not observable from the ground, can be detected. One example of this success is the large numbe…
A Study of Eight Visual-spectroscopic Southern Binaries Using Recent SOAR Observations
Docobo, José A.; Campo, Pedro P.; Costa, Edgardo +2 more
Speckle observations performed between 2019 and 2022 with the HRCam attached to the 4.1 m SOAR telescope (Cerro Pachón, Chile) permitted to improve visual orbits of the southern binaries WDS 01243-0655 (BU 1163), WDS 09275-5806 (CHR 240), WDS 12114-1647 (S 643 AaAb), WDS 13317-0219 (HDS 1895), WDS 15282-0921 (BAG 25 AaAb), WDS 17304-0104 (STF 2173…