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Two-colour photometry for 9473 components of close Hipparcos double and multiple stars
Using observations obtained with the Tycho instrument of the ESAHipparcos satellite, a two-colour photometry is produced for componentsof more than 7 000 Hipparcos double and multiple stars with angularseparations 0.1 to 2.5 arcsec. We publish 9473 components of 5173systems with separations above 0.3 arcsec. The majority of them did nothave Tycho photometry in the Hipparcos catalogue. The magnitudes arederived in the Tycho B_T and V_T passbands, similar to the Johnsonpassbands. Photometrically resolved components of the binaries withstatistically significant trigonometric parallaxes can be put on an HRdiagram, the majority of them for the first time. Based on observationsmade with the ESA Hipparcos satellite.
| An investigation of the micro-variations of highly luminous OBA type stars. I
Photometric observations of eight OBA stars of absolute bolometricmagnitude brighter than -7 mag, obtained during the Walraven five-colorsimultaneous VBLUW photometer with a 16-arcsec aperture on the 90-cmDutch Light Collector at ESO since 1980 are reported. The data-reductionprocedures are explained; the stability of the comparison stars ischaracterized; and the data are presented in tables and graphs.Brightness variations of 0.01-0.1 mag on time scales of days or weeksare observed in all eight objects, the mean error of the nightlyaverages being about + or - 0.002 mag, and a secular decrease of 0.012mag over about 2 yr is found for HD 37022. The larger variations seen inthe B-U color indices of some of the stars are attributed toshort-period (days or less) variations in temperature and/or densitynear the stellar surfaces.
| Five-channel photometry of cepheids and supergiants in the southern Milky Way.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1976A&AS...24..413P&db_key=AST
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