Apsidal motion and TESS light curves of two southern eclipsing binaries with high eccentricity: V1647 Sgr and V2283 Sgr

Abstract

The study of apsidal motion rates in eccentric eclipsing binaries provides an important observational test of theoretical models of stellar structure and evolution. Precise physical parameters of the stellar components together with systematic measurements of the periastron advance are needed. We present new results of our long-term observational project to analyze the apsidal motion in early-type eccentric eclipsing binaries. New ground and space-based photometric data were obtained, and archival spectroscopic measurements were used in this study of two detached southern-hemisphere eclipsing binaries: V1647 Sgr (P=3.28 d, e=0.41), and V2283 Sgr (3.47, 0.49). Their TESS observations in four sectors have also been included and the corresponding light curves were solved using the Phoebe code. The newly completed O-C diagrams were analyzed using all reliable timings found in the literature and calculated using the TESS light curves. New or improved values were obtained for the elements of apsidal motion. Using archival spectroscopy for V1647 Sgr, the precise absolute parameters were improved: M1 = 2.184(0.035) M${}_{\odot }$, M2 = 1.957(0.035) M${}_{\odot }$, and R1 = 1.839(0.015) R${}_{\odot }$, R2 = 1.716(0.015) R${}_{\odot }$. For V2283 Sgr the absolute dimensions were newly estimated: M1 = 2.178(0.10) M${}_{\odot }$, M2 = 1.547(0.10) M${}_{\odot }$, and R1 = 1.796(0.01) R${}_{\odot }$, R2 = 1.544(0.01) R${}_{\odot }$. We improved relatively long periods of apsidal motion of about 580 and 530 years, together with the corresponding internal structure constants, log k2, -2.394, and -2.418, for V1647 Sgr and V2283 Sgr, respectively. The relativistic contribution to apsidal motion is not negligible, making about 12 resp. 14% of the total rate of apsidal motion. No signs of the presence of an additional body were revealed in the light curves or in the O-C diagrams of both eccentric systems.

arXiv commentAccepted for publication in Astronomy & Astrophysics, 12 pages, 8 figures, 8 tables. arXiv admin note: substantial text overlap with arXiv:2408.06910

References in corpus (29)

• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• The Transiting Exoplanet Survey Satellite
• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• The SIMBAD astronomical database
• The VizieR database of Astronomical Catalogues
• Accurate masses and radii of normal stars: modern results and applications
• The Revised TESS Input Catalog and Candidate Target List
• Achieving better than 1 minute accuracy in the Heliocentric and Barycentric Julian Dates
• A Computational Guide to Physics of Eclipsing Binaries. Paper I. Demonstrations and Perspectives
• "Pi of the Sky" - all-sky, real-time search for fast optical transients
• The dependence of convective core overshooting on stellar mass: reality check, and additional evidence
• Apsidal motion and light a curve solution for eighteen SMC eccentric eclipsing binaries
• Massive heartbeat stars from TESS. I. TESS sectors 1-16
• Updating the theoretical tidal evolution constants: Apsidal motion and the moment of inertia
• Analysis of apsidal motion in eclipsing binaries using TESS data II. A test of internal stellar structure}
• Analysis of apsidal motion in eclipsing binaries using TESS data: I. A test of gravitational theories
• Apsidal motion in the massive binary HD152218
• Apsidal motions of 90 eccentric binary systems in the Small Magellanic Cloud
• Design, upgrade and characterization of the silicon photomultiplier front-end for the AMIGA detector at the Pierre Auger Observatory
• Theoretical tidal evolution constants for stellar models from the pre-main sequence to the white dwarf stage Apsidal motion constants, moment of inertia, and gravitational potential energy
• Absolute dimensions of the eccentric eclipsing binary V541 Cygni
• Apsidal motion in the massive binary HD152248
• Apsidal motion in massive eccentric binaries: The case of CPD-41${}^{\circ }$7742, and HD 152218 revisited
• Apsidal motion in massive eccentric binaries in NGC 6231: The case of HD 152219
• Revised physical elements of the astrophysically important O9.5+O9.5V eclipsing binary system Y Cyg
• Absolute dimensions and apsidal motion of the eclipsing binaries V889 Aql and V402 Lac
• First apsidal motion and light curve analysis of 162 eccentric eclipsing binaries from LMC
• Modeling Apsidal Motion in Eclipsing Binaries using ELC
• Six new eccentric eclipsing systems with a third body