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Observations of Binary Stars with the Differential Speckle Survey Instrument. I. Instrument Description and First Results
First results of a new speckle imaging system, the Differential SpeckleSurvey Instrument, are reported. The instrument is designed to takespeckle data in two filters simultaneously with two independent CCDimagers. This feature results in three advantages over other specklecameras: (1) twice as many frames can be obtained in the sameobservation time which can increase the signal-to-noise ratio forastrometric measurements, (2) component colors can be derived from asingle observation, and (3) the two colors give substantial leverageover atmospheric dispersion, allowing for subdiffraction-limitedseparations to be measured reliably. Fifty-four observations arereported from the first use of the instrument at theWisconsin-Indiana-Yale-NOAO 3.5 m Telescope9The WIYNObservatory is a joint facility of the University of Wisconsin-Madison,Indiana University, Yale University, and the National Optical AstronomyObservatories. in 2008 September, including seven components resolvedfor the first time. These observations are used to judge the basiccapabilities of the instrument.
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| Pulkovo compilation of radial velocities for 35495 stars in a common system.
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Observation and Astrometry data
| Constellation: | Draco |
| Right ascension: | 18h15m21.75s |
| Declination: | +57°20'07.7" |
| Apparent magnitude: | 8.315 |
| Distance: | 60.827 parsecs |
| Proper motion RA: | 14.8 |
| Proper motion Dec: | -64.5 |
| B-T magnitude: | 9.191 |
| V-T magnitude: | 8.388 |
Catalogs and designations:
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