A Spectroscopic and Photometric Investigation of the Mercury-Manganese Star KIC 6128830
arXiv:1711.08519 · doi:10.1093/mnras/stx2974
Abstract
The advent of space-based photometry provides the opportunity for the first precise characterizations of variability in Mercury-Manganese (HgMn/CP3) stars, which might advance our understanding of their internal structure. We have carried out a spectroscopic and photometric investigation of the candidate CP3 star KIC 6128830. A detailed abundance analysis based on newly-acquired high-resolution spectra was performed, which confirms that the star's abundance pattern is fully consistent with its proposed classification. Photometric variability was investigated using four years of archival Kepler data. In agreement with results from the literature, we have identified a single significant and independent frequency =0.2065424 d with a peak-to-peak amplitude of 3.4 mmag and harmonic frequencies up to . Drawing on the predictions of state-of-the-art pulsation models and information on evolutionary status, we discuss the origin of the observed light changes. Our calculations predict the occurrence of g-mode pulsations at the observed variability frequency. On the other hand, the strictly mono-periodic nature of the variability strongly suggests a rotational origin. While we prefer the rotational explanation, the present data leave some uncertainty.
arXiv comment13 pages, 13 figures, accepted for publication in MNRAS
References in corpus (36)
- The chemical composition of the Sun
- Modules for Experiments in Stellar Astrophysics (MESA)
- Validation of the new Hipparcos reduction
- Modules for Experiments in Stellar Astrophysics (MESA): Giant Planets, Oscillations, Rotation, and Massive Stars
- Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
- MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
- MESA Isochrones and Stellar Tracks (MIST) 0: Methods for the construction of stellar isochrones
- Kepler Mission Design, Realized Photometric Performance, and Early Science
- Presupernova Evolution of Rotating Massive Stars I: Numerical Method and Evolution of the Internal Stellar Structure
- Kepler Input Catalog: Photometric Calibration and Stellar Classification
- HERMES: a high-resolution fibre-fed spectrograph for the Mercator telescope
- A fossil origin for the magnetic fields of A-stars and white dwarfs
- Revised Stellar Properties of Kepler Targets for the Quarter 1-16 Transit Detection Run
- Initial Characteristics of Kepler Long Cadence Data For Detecting Transiting Planets
- Initial Characteristics of Kepler Short Cadence Data
- Weak magnetic fields in Ap/Bp stars: Evidence for a dipole field lower limit and a tentative interpretation of the magnetic dichotomy
- Kepler observations of variability in B-type stars
- Spectroscopic survey of Kepler stars. I. HERMES/Mercator observations of A- and F-type stars
- Beyond the Kepler/K2 bright limit: variability in the seven brightest members of the Pleiades
- Weather in stellar atmosphere: the dynamics of mercury clouds in alpha Andromedae
- Inhomogeneous surface distribution of chemical elements in the eclipsing binary AR Aur: A new challenge for our understanding of HgMn stars
- Domains of pulsational instability of low-frequency modes in rotating upper main-sequence stars
- Multiplicity of late-type B stars with HgMn peculiarity
- The Classificiation of Kepler B star Variables
- Magnetic fields of HgMn stars
- Dynamical evolution of titanium, strontium, and yttrium spots on the surface of the HgMn star HD 11753
- The Age and Interior Rotation of Stars from Asteroseismology
- Excitation and visibility of slow modes in rotating B-type stars
- HVS7: a chemically peculiar hyper-velocity star
- New Photometrically Variable Magnetic Chemically Peculiar Stars in the ASAS-3 Archive
- Are there tangled magnetic fields on HgMn stars?
- Neon abundances in normal late-B and mercury-manganese stars
- Characterization of Kepler early-type targets
- A photometric study of chemically peculiar stars with the STEREO satellites. II. Non-magnetic chemically peculiar stars
- Looking for pulsations in HgMn stars through CoRoT lightcurves
- A search for pulsations in the HgMn star HD 45975 with CoRoT photometry and ground-based spectroscopy
Cited by in corpus (11)
- TESS survey of rotational and pulsational variability of mercury-manganese stars
- The SDSS/APOGEE Catalog of HgMn Stars
- New mercury-manganese stars and candidates from LAMOST DR4
- ELISa: A new tool for fast modelling of eclipsing binaries
- A spectroscopic test of the rotational modulation origin of periodic \emph{Kepler} photometric variability of A-type stars
- The nature of the photometric variability of HgMn stars: A test of simulated light curves of ϕ Phe against the TESS data
- Search for stellar spots in field blue horizontal-branch stars
- Orbital parameters and evolutionary status of the highly peculiar binary system HD 66051
- V680 Mon -- a young mercury-manganese star in an eclipsing heartbeat system
- V772 Cas: an ellipsoidal HgMn star in an eclipsing binary
- Understanding the rotational variability of K2 targets. HgMn star KIC 250152017 and blue horizontal branch star KIC 249660366