Speckle observations with PISCO in Merate: IV. Astrometric measurements of visual binaries in 2005

Details Speckle observations with PISCO in Merate: IV. Astrometric measurements of visual binaries in 2005 Speckle observations with PISCO in Merate: IV. Astrometric measurements of visual binaries in 2005

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008an....329...54s&link_type=abstract

Astronomische Nachrichten, Vol.329, Issue 1, p.54

Statistics

Computation

13

Astrometry, Binaries: Close, Binaries: Visual, Stars: Individual (Ads 684, Mca 55Aac, Ads 14783), Techniques: Interferometric

Scientific paper

We present relative astrometric measurements of visual binaries made during the second semester of 2005, with the speckle camera PISCO at the 102 cm Zeiss telescope of Brera Astronomical Observatory, in Merate. Our sample contains orbital couples as well as binaries whose motion is still uncertain. The purpose of this long term program is to improve the accuracy of the orbits and determine the masses of the components.\ We performed 130 new observations of 120 objects, with most of the angular separations in the range 0\farcs1-4\arcsec, and with an average accuracy of 0\farcs01. Most of the position angles could be determined without the usual 180° ambiguity with the application of triple-correlation techniques, and their mean error is 0\fdg8. We have found a possible new triple system: ADS 11077. škip0.15cm The measurements of the closest binaries were made with a new data reduction procedure, based on model fitting of the background of the auto-correlations. As this procedure proved to be very efficient, we have re-processed the old observations of close binaries made with PISCO in Merate since 2004. We thus improved 20 measurements already published and obtained 7 new measurements for observations that were previously reported as ``unresolved".\ We finally present revised orbits for ADS 684, MCA 55Aac (in the Beta 1 Cyg-Albireo multiple system) and ADS 14783 for which the previously published orbits led to large residuals with our measurements and for which the new observations made since their computation allowed a significant improvement of those old orbits. The sum of the masses that we derived for those systems are consistent with the spectral type of the stars and the dynamic parallaxes are in good agreement with the parallaxes measured by Hipparcos.

Affiliated with

Also associated with

No associations

Rating

Speckle observations with PISCO in Merate: IV. Astrometric measurements of visual binaries in 2005 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Speckle observations with PISCO in Merate: IV. Astrometric measurements of visual binaries in 2005, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Speckle observations with PISCO in Merate: IV. Astrometric measurements of visual binaries in 2005 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1592856