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Speckle Interferometry at the US Naval Observatory. VI.
The results of 1068 speckle interferometric observations of doublestars, made with the 26 inch (0.66 m) refractor of the US NavalObservatory, are presented. These observations are averaged into 841means of 815 binary stars. The systems range in separation from 0.22" to6.01" with a mean separation of 2.21" and have a limiting secondarymagnitude of V=12.5. This is the sixth in a series of papers presentingmeasures obtained with this system, and it covers the period 1999January 1 through 2000 January 9.
| The Henry Draper Extension Charts: A catalogue of accurate positions, proper motions, magnitudes and spectral types of 86933 stars
The Henry Draper Extension Charts (HDEC), published in the form offinding charts, provide spectral classification for some 87000 starsmostly between 10th and 11th magnitude. This data, being highlyvaluable, as yet was practically unusable for modern computer-basedastronomy. An earlier pilot project (Roeser et al. 1991) demonstrated apossibility to convert this into a star catalogue, using measurements ofcartesian coordinates of stars on the charts and positions of theAstrographic Catalogue (AC) for subsequent identification. We presenthere a final HDEC catalogue comprising accurate positions, propermotions, magnitudes and spectral classes for 86933 stars of the HenryDraper Extension Charts.
| Stars classified as constant in the General Catalog of Variable Stars
Photometric observations have been made of 16 stars classified asconstant, CST, or CST; in the General Catalog of Variable Stars. Onestar, U Tauri, was found to be a rapid irregular variable and threeothers may vary at a low level. In two cases, FV Delphini and FPGeminorum, the star identified as the variable on published findingcharts is not variable but a nearby star did vary. It is suggested thatthe wrong stars were marked on the charts but the possibility remainsthat the variables may have exhibited constancy during earlierobservations.
| OH masers in short-period Mira and semiregular variable stars
The results of a systematic search in all four OH lines for maseremission from the short-period Mira variables and the known short-periodsemiregular maser stars are reported. R Ceti was detected in the mainlines, the first short-period (166 days) Mira ever found in OH. None ofthe short-period Miras searched showed water emission. Also presentedare spectra of three SiO detections made in a very limited sample of theshort-period Mira variables. Six new OH lines were detected in thesemiregular variables; all are type I stars devoid of any satellite-lineemission. Both classes of star are weak OH emitters, and there is arelative lack of circumstellar material as evidenced by the modestinfrared excess shown in the 2.2-11-micron color index. These facts areprobably related and lend support to the idea that FIR radiation is theprimary OH maser pump in these stars.
| A catalogue of variable-visual binary stars
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1981A&AS...44..179P&db_key=AST
| The Zero-Point of the Period-Luminosity-Relation of Cepheids
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1970A&A.....5..116G&db_key=AST
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Observation and Astrometry data
| Constellation: | Ταύρος |
| Right ascension: | 04h21m50.10s |
| Declination: | +19°48'48.6" |
| Apparent magnitude: | 10.657 |
| Proper motion RA: | 5.2 |
| Proper motion Dec: | -42.1 |
| B-T magnitude: | 11.35 |
| V-T magnitude: | 10.715 |
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