The HgMn Binary Star Phi Herculis: Detection and Properties of the Secondary and Revision of the Elemental Abundances of the Primary

Abstract

Observations of the Mercury-Manganese star phi Her with the Navy Prototype Optical Interferometer (NPOI) conclusively reveal the previously unseen companion in this single-lined binary system. The NPOI data were used to predict a spectral type of A8V for the secondary star phi Her B. This prediction was subsequently confirmed by spectroscopic observations obtained at the Dominion Astrophysical Observatory. Phi Her B is rotating at 50 +/- 3 km s(-1), in contrast to the 8 km s(-1) lines of phi Her A. Recognizing the lines from the secondary permits one to separate them from those of the primary. The abundance analysis of phi Her A shows an abundance pattern similar to those of other HgMn stars with Al being very underabundant and Sc, Cr, Mn, Zn, Ga, Sr, Y, Zr, Ba, Ce, and Hg being very overabundant.

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Document Details

Document Type
Technical Report
Publication Date
Oct 26, 2006
Accession Number
ADA458275

Entities

People

  • A. F. Gulliver
  • C. A. Hummel
  • D. J. Hutter
  • H. Caliskan
  • J. T. Armstrong
  • K. J. Johnston
  • R. T. Zavala
  • S. J. Adelman
  • T. A. Pauls

Organizations

  • United States Naval Observatory

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Astronomy
  • Binary Stars
  • Elements
  • Interferometers
  • Interferometry
  • Measurement
  • Metals
  • Military Research
  • Models
  • Observation
  • Observatories
  • Optical Interferometers
  • Radial Velocity
  • Space Sciences
  • Spectra
  • Universities

Fields of Study

  • Physics

Readers

  • Astronomy/Astrophysics
  • Materials Science and Engineering.

Technology Areas

  • Space