Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...269..282h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 269, no. 1-2, p. 282-290.
Astronomy and Astrophysics
Astronomy
27
Binary Stars, Infrared Astronomy, Pre-Main Sequence Stars, Speckle Interferometry, Variable Stars, Diffraction Patterns, Massive Stars
Scientific paper
Two-dimensional speckle interferometric observations at 2.2 microns (K) obtained at the NOAO 4 m telescope in December 1990 unambiguously show the premain sequence star Z CMa to be a binary with a separation of 0.10 +/- 0.01 arcsec (115 AU) at a position angle of 122 +/- 2 deg. Since the diffraction limit is lambda/D = 0.12 arcsec, this result proves that 2D speckle interferometry reaches subdiffraction-limited resolution. Furthermore, photometric comparison with 1D H and K band speckle data obtained at the Calar Alto 3.5 m telescope between 1986 and 1989 reveals independent brightness variations of both components. Our data show no indication of a scattering halo, such as could be expected in the presence of a massive circumbinary disk.
Christou Julian C.
Haas Marcel
Leinert Ch.
Ridgway Stephen T.
Zinnecker Hans
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