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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.
| Simultaneous intensive photometry and high resolution spectroscopy of Delta Scuti stars. 1: Mode typing of HD 106384 defined as FG Virginis
53 hours of photometric observations and 7 hours of consecutive highresolution spectroscopic observations of the Delta Scuti star HD 106384defined as FG Vir have been obtained. From photometry we were able todetect 7 pulsation modes, 4 of which were also seen in the time seriesdescribing the variations of line profiles. From spectroscopy we alsoderived v sin i = 21 km/s and estimated i approximately = 30 deg. Theensuing discussion of the combined results of the analyses ofphotometric and spectroscopic data suggests that the dominant 12.72 c/dterm is probably the first radial overtone mode, two other terms (9.66and 19.86 c/d) are nonradial non-axisymmetric modes, while a fourth term(24.22 c/d) is an axisymmetric mode (may be radial). Problems connectedto mode typing and possible effects due to rotational splitting are alsodiscussed.
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