Resolving OB Systems in the Carina Nebula with the Hubble Space Telescope Fine Guidance Sensor

Details Resolving OB Systems in the Carina Nebula with the Hubble Space Telescope Fine Guidance Sensor Resolving OB Systems in the Carina Nebula with the Hubble Space Telescope Fine Guidance Sensor

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aj....128..323n&link_type=abstract

The Astronomical Journal, Volume 128, Issue 1, pp. 323-329.

Astronomy and Astrophysics

Astronomy

40

Stars: Binaries: Close, Stars: Binaries: Visual, Ism: Individual: Name: Carina Nebula, Stars: Early-Type, Stars: Winds, Outflows, Techniques: Interferometric

Scientific paper

We observed 23 OB stars in the Carina Nebula (NGC 3372) with the Hubble Space Telescope's Fine Guidance Sensor 1r (FGS1r) in its high angular resolution mode. Five of these OB stars are newly resolved binaries with projected separations ranging from 0.015" to 0.352" (37 to 880 AU at a distance of 2.5 kpc), and V-band magnitude differences ranging from 0.9 to 2.8. The most important astrophysical result is the unexpected resolution of the prototype O2 If* star HD 93129A as a 55 milliarcsecond (mas) double with a ΔmV of 0.9. This object has served as a spectroscopic benchmark for the analysis of the most massive hot stars and their winds on the prior assumption that it is a single star. This discovery supports the interpretation of recent radio and X-ray observations as evidence of colliding-wind phenomena in HD 93129A. Another interesting result is the determination of an upper limit of about 35 AU for the projected separation of the binary pairs in the hierarchical double spectroscopic binary HD 93206. The high incidence of resolved binaries provides motivation for a more thorough, statistically meaningful study of multiplicity among the most massive stars in the young ionizing clusters of the nebula to obtain a complete sample of the long-period systems that have evaded spectroscopic detection. However, considering that the nine spectroscopic binaries with accurate orbits in the Carina Nebula have orbital dimensions <~1 AU, which at a distance of 2.5 kpc subtends an angle of only 0.4 mas, well below the ~=10 mas angular resolution of FGS1r, there remains a significant range of orbital periods and separations over which it is very difficult to detect multiplicity in the nebula with currently available instruments.
Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under NASA contract NAS 5-26555.

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