HD66051, an eclipsing binary hosting a highly peculiar, HgMn-related star

Abstract

HD66051 is an eclipsing system with an orbital period of about 4.75 d that exhibits out-of-eclipse variability with the same period. New multicolour photometric observations confirm the longevity of the secondary variations, which we interpret as a signature of surface inhomogeneities on one of the components. Using archival and newly acquired high-resolution spectra, we have performed a detailed abundance analysis. The primary component is a slowly rotating late B-type star ($T_{\mathrm{eff}}=12500\pm 200$ K; $\log g=4.0$, $v\sin i=27\pm 2$ km s${}^{-1}$) with a highly peculiar composition reminiscent of the singular HgMn-related star HD 65949, which seems to be its closest analogue. Some light elements as He, C, Mg, Al are depleted, while Si and P are enhanced. Except for Ni, all the iron-group elements, as well as most of the heavy elements, and in particular the REE elements, are overabundant. The secondary component was estimated to be a slowly rotating A-type star ($T_{\mathrm{eff}}\sim 8000$ K; $\log g=4.0$, $v\sin i\sim 18$ km s${}^{-1}$). The unique configuration of HD\,66051 opens up intriguing possibilities for future research, which might eventually and significantly contribute to the understanding of such diverse phenomena as atmospheric structure, mass transfer, magnetic fields, photometric variability and the origin of chemical anomalies observed in HgMn stars and related objects.

arXiv commentpublished in Scientific Reports (see www.nature.com/srep/ for the published version)

References in corpus (18)

• The chemical composition of the Sun
• A fossil origin for the magnetic fields of A-stars and white dwarfs
• Weak magnetic fields in Ap/Bp stars: Evidence for a dipole field lower limit and a tentative interpretation of the magnetic dichotomy
• A new catalogue of Stroemgren-Crawford uvbybeta photometry
• Chemically peculiar stars and their temperature calibration
• Weather in stellar atmosphere: the dynamics of mercury clouds in alpha Andromedae
• The light variability of the helium strong star HD 37776 as a result of its inhomogeneous elemental surface distribution
• Multiplicity of late-type B stars with HgMn peculiarity
• Magnetic fields of HgMn stars
• The applications of the MHD Alfven wave oscillation model for kHz quasi-periodic oscillations
• Evolution of Magnetic Fields in Stars Across the Upper Main Sequence: II. Observed distribution of the magnetic field geometry
• A search for photometric variability in magnetic chemically peculiar stars using ASAS-3 data
• Doppler imaging of chemical spots on magnetic Ap/Bp stars. Numerical tests and assessment of systematic errors
• New Photometrically Variable Magnetic Chemically Peculiar Stars in the ASAS-3 Archive
• Ultraviolet and visual flux and line variations of one of the least variable Bp stars HD 64740
• HIDES spectroscopy of bright detached eclipsing binaries from the $Kepler$ field - I. Single-lined objects
• A search for pulsations in the HgMn star HD 45975 with CoRoT photometry and ground-based spectroscopy
• VSOP: The Variable Star One-shot Project I. Project presentation and first data release

Cited by in corpus (8)

• A plethora of new, magnetic chemically peculiar stars from LAMOST DR4
• New and improved rotational periods of magnetic CP stars from ASAS-3, KELT and MASCARA data
• HD66051: the first eclipsing binary hosting an early-type magnetic star
• Tango of celestial dancers: A sample of detached eclipsing binary systems containing g-mode pulsating components. A case study of KIC9850387
• Searching for Anomalies in the ZTF Catalog of Periodic Variable Stars
• Orbital parameters and evolutionary status of the highly peculiar binary system HD 66051
• Understanding the rotational variability of K2 targets. HgMn star KIC 250152017 and blue horizontal branch star KIC 249660366
• A rare phosphorus-rich star in an eclipsing binary from TESS