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Speckle Interferometry at the US Naval Observatory. VIII.
The results of 2044 speckle interferometric observations of doublestars, made with the 26 inch (66 cm) refractor of the US NavalObservatory, are presented. Each speckle interferometric observation ofa system represents a combination of over a thousand short-exposureimages. These observations are averaged into 1399 mean positions andrange in separation from 0.16" to 14.97", with a mean separation of2.51". This is the eighth in a series of papers presenting measuresobtained with this system and covers the period 2001 March 18 through2001 December 30.
| X-ray emission from wind blown interstellar bubbles. IV. ROSAT HRI observations of NGC 6888
We have observed the stellar wind blown bubble NGC6888 with the ROSAT HRI. A map and a catalogue of X-rayfilaments is derived, the typical filament being a few 0.1 pc in extentwith an HRI count rate of a few 10-4 s-1. We showthat this filamentary structure can qualitatively be modelled as localcount rate enhancements due to denser gas near evaporating cool clumpswhich in turn are seen in the optical and probably are produced byinstabilities after the passage of the primary shock front of theexpanding bubble.
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Observation and Astrometry data
| Constellation: | Δελφίνι |
| Right ascension: | 20h18m33.25s |
| Declination: | +10°59'31.5" |
| Apparent magnitude: | 8.654 |
| Proper motion RA: | -6.8 |
| Proper motion Dec: | -16.5 |
| B-T magnitude: | 9.035 |
| V-T magnitude: | 8.686 |
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