Physics – Optics
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...585.1007d&link_type=abstract
The Astrophysical Journal, Volume 585, Issue 2, pp. 1007-1014.
Physics
Optics
5
Stars: Binaries: Visual, Instrumentation: Adaptive Optics, Stars: Fundamental Parameters, Stars: Individual: Constellation Name: Ι Cassiopeiae, Techniques: High Anular Resolution
Scientific paper
The multiple-star system ι Cas was observed as a calibration for our adaptive optics observations in 2001 July with the Advanced Electro-Optical System (AEOS) 3.63 m telescope in Maui, Hawaii, and the first ever image of the faint astrometric component Aa (along with A and B) was obtained at the H-band wavelength. Another image was obtained in 2002 February with the same telescope, but that time in the I band. This wider image includes the C component and is the first to show four components. By combining our images with seven recent speckle interferometry measurements, a 47 yr period relative orbit is derived for the A-Aa components. Comparing the motion of B with respect to the A-Aa system, previous A-B orbits are rejected in favor of simple rectilinear motion of B across the field. Nevertheless, the history of the relative vector separation between B and A reveals the suborbital motion of A around its center of gravity with Aa, leading to a true orbit for A. The masses of A and Aa are thus determined to be 1.99+/-0.28 and 0.69+/-0.12 Msolar, respectively. Combining our differential photometry in the I and H bands with B and V information from the Tycho-2 catalog, we derive spectral types for all four from their colors: component A is spectral type A3 with peculiar red colors, Aa is G6, B is F5, and C is K3.
Based on observations made at the Maui Space Surveillance System operated by Detachment 15 of the US Air Force Research Laboratory's Directed Energy Directorate.
Drummond Jack
Milster Scott
Roberts Lewis C. Jr.
Ryan Patrick
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