Dissecting the Quadruple Binary Hyad vA 351 -- Masses for three M Dwarfs and a White Dwarf
arXiv:2104.02747 · doi:10.3847/1538-3881/abf5dc
Abstract
We extend results first announced by Franz et al. (1998), that identified vA 351 = H346 in the Hyades as a multiple star system containing a white dwarf. With Hubble Space Telescope Fine Guidance Sensor fringe tracking and scanning, and more recent speckle observations, all spanning 20.7 years, we establish a parallax, relative orbit, and mass fraction for two components, with a period, y and total mass 2.1 Msun. With ground-based radial velocities from the McDonald Observatory Otto Struve 2.1m telescope Sandiford Spectrograph, and Center for Astrophysics Digital Speedometers, spanning 37 years, we find that component B consists of BC, two M dwarf stars orbiting with a very short period (P_ BC=0.749 days), having a mass ratio M_C/M_B=0.95. We confirm that the total mass of the system can only be reconciled with the distance and component photometry by including a fainter, higher mass component. The quadruple system consists of three M dwarfs (A,B,C) and one white dwarf (D). We determine individual M dwarf masses M_A=0.53+/-0.10 Msun, M_B=0.43+/-0.04Msun, and M_C=0.41+/-0.04Msun. The WD mass, 0.54+/-0.04Msun, comes from cooling models, an assumed Hyades age of 670My, and consistency with all previous and derived astrometric, photometric, and RV results. Velocities from H-alpha and He I emission lines confirm the BC period derived from absorption lines, with similar (He I) and higher (H-alpha) velocity amplitudes. We ascribe the larger H-alpha amplitude to emission from a region each component shadows from the other, depending on the line of sight.
arXiv commentTo appear in The Astronomical Journal. Full tables and animation available here: https://www.dropbox.com/sh/cy71967po4u98xq/AAC1yWROgs7cPEFtjRTza9-ka?dl=0
References in corpus (42)
- Gaia Data Release 2. Summary of the contents and survey properties
- The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
- Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
- Gaia Early Data Release 3: The astrometric solution
- Kepler Input Catalog: Photometric Calibration and Stellar Classification
- The Eccentric Kozai-Lidov Effect and Its Applications
- The PPMXL catalog of positions and proper motions on the ICRS. Combining USNO-B1.0 and 2MASS
- How to Constrain Your M Dwarf: measuring effective temperature, bolometric luminosity, mass, and radius
- Stellar Diameters and Temperatures II. Main Sequence K & M Stars
- Large-scale magnetic topologies of late M dwarfs
- Large-scale magnetic topologies of mid-M dwarfs
- An Improved Spectroscopic Analysis of DA White Dwarfs from the Sloan Digital Sky Survey Data Release 4
- Unresolved stellar companions with Gaia DR2 astrometry
- Hubble Space Telescope Fine Guidance Sensor Parallaxes of Galactic Cepheid Variable Stars: Period-Luminosity Relations
- The H emission of nearby M dwarfs and its relation to stellar rotation
- A Comprehensive Spectroscopic Analysis of DB White Dwarfs
- Large-scale magnetic topologies of early M dwarfs
- Interferometric Astrometry of Proxima Centauri and Barnard's Star Using Hubble Space Telescope Fine Guidance Sensor 3: Detection Limits for sub-Stellar Companions
- Found: The missing blue opacity in atmosphere models of cool hydrogen white dwarfs
- Parallax Systematics and Photocenter Motions of Benchmark Eclipsing Binaries in Gaia EDR3
- Mergers and Obliquities in Stellar Triples
- The Solar Neighborhood XXXVII: The Mass-Luminosity Relation for Main Sequence M Dwarfs
- CARMENES input catalogue of M dwarfs. I. Low-resolution spectroscopy with CAFOS
- A Hipparcos study of the Hyades open cluster: Improved colour-absolute magnitude and Hertzsprung-Russell diagrams
- Age Determinations of the Hyades, Praesepe, and Pleiades via MESA Models with Rotation
- Distance Scale Zero-Points from Galactic RR Lyrae Star Parallaxes
- Photometry of Proxima Centauri and Barnard's Star Using HST Fine Guidance Sensor 3: A Search for Periodic Variations
- Re-processing the Hipparcos Transit Data and Intermediate Astrometric Data of spectroscopic binaries. I. Ba, CH and Tc-poor S stars
- Gaia Data Release 1. Open cluster astrometry: performance, limitations, and future prospects
- HST Fine Guidance Sensor Astrometric Parallaxes for Three Dwarf Novae: SS Aurigae, SS Cygni, and U Geminorum
- The Distances to Open Clusters from Main-Sequence Fitting. IV. Galactic Cepheids, the LMC, and the Local Distance Scale
- Observations of Binary Stars with the Differential Speckle Survey Instrument. VII. Measures from 2010 September to 2012 February at the WIYN Telescope
- The seven year Swift-XRT point source catalog (1SWXRT)
- Observations of Binary Stars with the Differential Speckle Survey Instrument. VI. Measures During 2014 at the Discovery Channel Telescope
- A Survey for Young Spectroscopic Binary K7-M4 Stars in Ophiuchus
- Astrometry with Hubble Space Telescope Fine Guidance Sensors - A Review
- Luminosity Discrepancy in the Equal-Mass, Pre--Main Sequence Eclipsing Binary Par 1802: Non-Coevality or Tidal Heating?
- Parameterizations of Chromospheric Condensations in dG and dMe Model Flare Atmospheres
- Precise Masses for Wolf 1062 AB from Hubble Space Telescope Interferometric Astrometry and McDonald Observatory Radial Velocities
- Astrometry with the Hubble Space Telescope: Trigonometric Parallaxes of Selected Hyads
- A Gaia DR2 view of white dwarfs in the Hyades
- Temporal changes of the flare activity of Proxima Cen