Infrared imaging of M Cas B using rapid image motion compensation

D. Mccarthy, T. Hancock, J. Freeman, B. McLeod, M. Lloyd-Hart, D. Colucci, P. Wizinowich, M. Clampin, D. Golimowski, S. Durrance

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


The orbital parameters and component masses of the μ Cas binary system can provide a measure of the helium abundance in the early Galaxy. In a continuing effort to measure these characteristics, we have obtained the first direct images of the low mass companion to μ Cas A using techniques for high speed correction of image motion at 1.25 and 1.65 μm. These techniques include real-time tracking of the brightest infrared speckle at 75 Hz and of the visible centroid at 500 Hz. Mu Cas B is easily detected with a magnitude difference relative to the primary of > 4 at a separation of ∼1.4 arcsec. Its energy distribution from 0.55 to 3.4 μm yields an effective temperature (3034±160 K), stellar diameter (0.26 R), and luminosity (0.0051±0.0011 L). A direct mass measurement using two photocentric orbits yields 0.15±0.0013 script M. Significant improvements in these parameters can result from astrometric, spectroscopic, and imaging observations of the upcoming periastron passage.

Original languageEnglish (US)
Pages (from-to)652-659
Number of pages8
JournalAstronomical Journal
Issue number2
StatePublished - Feb 1993

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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