Hubble Space Telescope Astrometry of the Procyon System

Abstract

The nearby star Procyon is a visual binary containing the F5 IV-V subgiant Procyon A, orbited in a 40.84 yr period by the faint DQZ white dwarf Procyon B. Using images obtained over two decades with the Hubble Space Telescope, and historical measurements back to the 19th century, we have determined precise orbital elements. Combined with measurements of the parallax and the motion of the A component, these elements yield dynamical masses of 1.478 +/- 0.012 Msun and 0.592 +/- 0.006 Msun for A and B, respectively. The mass of Procyon A agrees well with theoretical predictions based on asteroseismology and its temperature and luminosity. Use of a standard core-overshoot model agrees best for a surprisingly high amount of core overshoot. Under these modeling assumptions, Procyon A's age is ~2.7 Gyr. Procyon B's location in the H-R diagram is in excellent agreement with theoretical cooling tracks for white dwarfs of its dynamical mass. Its position in the mass-radius plane is also consistent with theory, assuming a carbon-oxygen core and a helium-dominated atmosphere. Its progenitor's mass was 1.9-2.2 Msun, depending on its amount of core overshoot. Several astrophysical puzzles remain. In the progenitor system, the stars at periastron were separated by only ~5 AU, which might have led to tidal interactions and even mass transfer; yet there is no direct evidence that these have occurred. Moreover the orbital eccentricity has remained high (~0.40). The mass of Procyon B is somewhat lower than anticipated from the initial-to-final-mass relation seen in open clusters. The presence of heavy elements in its atmosphere requires ongoing accretion, but the place of origin is uncertain.

arXiv commentAccepted by Astrophysical Journal

References in corpus (25)

• Validation of the new Hipparcos reduction
• Long-Term Stability of Planets in Binary Systems
• A Tidally-Disrupted Asteroid Around the White Dwarf G29-38
• An Improved Spectroscopic Analysis of DA White Dwarfs from the Sloan Digital Sky Survey Data Release 4
• A Comprehensive Spectroscopic Analysis of DB White Dwarfs
• Found: The missing blue opacity in atmosphere models of cool hydrogen white dwarfs
• YREC: The Yale Rotating Stellar Evolution Code
• Spectroscopic Signatures of Convection in the Spectrum of Procyon. Fundamental Parameters and Iron Abundance
• Tight asteroseismic constraints on core overshooting and diffusive mixing in the slowly rotating pulsating B8.3V star KIC 10526294
• A multi-site campaign to measure solar-like oscillations in Procyon. I. Observations, Data Reduction and Slow Variations
• High-contrast Imaging Search for Planets and Brown Dwarfs around the Most Massive Stars in the Solar Neighborhood
• The open cluster initial-final mass relationship and the high-mass tail of the white dwarf distribution
• High Redshift Supernovae in the Hubble Deep Field
• A multi-site campaign to measure solar-like oscillations in Procyon. II. Mode frequencies
• The diameter and evolutionary state of Procyon A
• Imaging planets around nearby white dwarfs
• Orbital and Evolutionary Constraints on the Planet Hosting Binary GJ 86 from the Hubble Space Telescope
• Three-dimensional interferometric, spectrometric, and planetary views of Procyon
• The Age and Stellar Parameters of the Procyon Binary System
• Wind-accretion disks in wide binaries, second generation protoplanetary disks and accretion onto white dwarfs
• Empirical Corrections for Charge Transfer Inefficiency and Associated Centroid Shifts for STIS CCD Observations
• Modeling Convective Core Overshoot and Diffusion in Procyon Constrained by Asteroseismic Data
• Asteroseismology of Procyon with SOPHIE
• Search for Higgs shifts in white dwarfs
• Asteroseismic modelling of Procyon A: Preliminary results

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