Rediscussion of eclipsing binaries. Paper XIX. The long-period solar-type system V454 Aurigae

Southworth, John

Abstract

V454 Aur is an eclipsing binary system containing two solar- type stars on an orbit of relatively long period (P P = 2702 d) and large eccentricity (e e = 0381). Eclipses were detected using data from the Hipparcos satellite, and a high-quality double- lined spectroscopic orbit has been presented by Griffin1. 1 . The NASA Transiting Exoplanet Survey Satellite ( TESS ) has observed the system during eight sectors, capturing ten eclipses in their entirety. V454 Aur is unusual in that the primary star - the star eclipsed at the deeper minimum - is less massive, smaller, and cooler than its companion. This phenomenon can occur in certain configurations of eccentric orbits when the stars are closer together at the primary eclipse, causing a larger area to be eclipsed than at the secondary. We use the radial-velocity measurements from Griffin and the light-curves from TESS to determine the masses and radii of the component stars for the first time, finding masses of 1034 + 0006 M (R) and 1161 + 0008 M (R) , and radii of 0979 + 0003 R (R) and 1211 + 0003 R (R) . Our measurement of the distance to the system is consistent with that from the Gaia DR3 parallax. A detailed spectroscopic study to determine chemical abundances and more precise temperatures is encouraged. Finally, we present equations to derive the effective temperatures of the stars from the inferred temperature of the system as a whole, plus the ratio of the radii and either the surface brightness or light ratio of the stars.

Citation

Southworth, J. (2024). Rediscussion of eclipsing binaries. Paper XIX. The long-period solar-type system V454 Aurigae. Observatory, 144(1301), https://doi.org/10.48550/arXiv.2404.19443

• Journal Article Type: Article
• Acceptance Date: Apr 2, 2024
• Publication Date: 2024-08
• Deposit Date: Oct 4, 2024
• Journal: Observatory
• Print ISSN: 0029-7704
• Peer Reviewed: Peer Reviewed
• Volume: 144
• Issue: 1301
• DOI: https://doi.org/10.48550/arXiv.2404.19443
• Keywords: LIMB-DARKENING COEFFICIENTS; GENEVA-COPENHAGEN SURVEY; ACCURATE MASSESS; DSS UGRIZ; KEPLER; STARS; TESS; CATALOG; DWARFI.
• Public URL: https://keele-repository.worktribe.com/output/948145
• Publisher URL: https://arxiv.org/abs/2404.19443#:~:text=Abstract:%20V454%20Aur%20is%20an%20eclipsing%20binary%20system%20containing%20two