Doppler Tomography of the Circumstellar Disk of the Be Star κ Draconis
Gabitova I.A. Miroshnichenko A.S. Zharikov S.V. Amantayeva A. Khokhlov S.A.
June 2024Multidisciplinary Digital Publishing Institute (MDPI)
Galaxies
2024#12Issue 3
(Formula presented.) Draconis is a binary system with a classical Be star as the primary component. Its emission-line spectrum consists of hydrogen lines, notably the H (Formula presented.) line with peak intensity ratio (V/R) variations phase-locked with the orbital period P = 61.55 days. Among binaries demonstrating the Be phenomenon, (Formula presented.) Dra stands out as one of a few systems with a discernible mass of its secondary component. Based on more than 200 spectra obtained in 2014–2023, we verified the physical parameters and constructed the mass function. We used part of these data obtained in 2014–2021 to investigate regions in the circumstellar disk of the primary component that emit the H (Formula presented.) line using the Doppler tomography method. The results show that the disk has a non-uniform density distribution with a prominent enhancement at (Formula presented.) ≈ 99 km (Formula presented.) and (Formula presented.) (Formula presented.) km (Formula presented.) that corresponds to a cloud-like source of the double-peaked H (Formula presented.) line profile. We argue that this enhancement’s motion is responsible for the periodic variations in the H (Formula presented.) V/R ratio, which is synchronised in orbital phase with the radial velocity (RV) of absorption lines from the atmosphere of the primary component.
binary system , circumstellar matter , Doppler tomography , emission-line stars , spectroscopy , variable stars
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Faculty of Physics and Technology, Al-Farabi Kazakh National University, Al-Farabi Ave., 71, Almaty, 050040, Kazakhstan
Department of Physics and Astronomy, University of North Carolina—Greensboro, Greensboro, 27402, NC, United States
Fesenkov Astrophysical Institute, Observatory, 23, Almaty, 050020, Kazakhstan
Observatorio Astronomico Nacional, Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, BC, Ensenada, 22800, Mexico
Faculty of Physics and Technology
Department of Physics and Astronomy
Fesenkov Astrophysical Institute
Observatorio Astronomico Nacional
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