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Pulsating B Stars Discovered by HIPPARCOS
Eyer, L.; Aerts, C.; De Cat, P. +4 more
We present a classification of 267 new variable B-type stars discovered by Hipparcos, which results in, among others, a huge number of new Slowly Pulsating B stars and several supergiants with ? Cyg-type variations. Our results clearly point out the bias towards short-period variables of earlier, ground-based surveys of variable stars.
The po…The HIPPARCOS Mission: a New Era for Variable Star Astronomy
Eyer, L.; Grenon, M.
Initially planned as a pure astrometric mission, Hipparcos was optimized to produce the highest achievable photometric accuracy in the Hp broad-band and in the Tycho BT and VT bands. A complex calibration process allowed to cope with the rapid change of the optics and to fix the magnitude scale to better than 0.001 magnitude throughout the mission…
The Characteristics of the Cool Component of the Cataclysmic Variable AE Aquarii from Hipparcos Observations
Friedjung, M.
The parallax of the cataclysmic binary AE Aquarii, found using the Hipparcos satellite, is combined with published infrared observations. Indications are obtained that the cool component is somewhat above the main sequence. However, this result is not absolute because of the errors and uncertainties.
Using XMM-Newton and Optical Photometry to Figure Out CVs
Szkody, P.; Henden, A.; Homer, L.
X-ray light curves from XMM-Newton combined with optical data from the satellite and ground-based observers provide distinctive shapes and periodicities that give information on the correct classification of cataclysmic variables. Our recent data on three SDSS sources with strong helium emission are used to identify a highly magnetic system (a pol…
Pulsating B Stars Discovered by HIPPARCOS
Poretti, E.; Musazzi, F.
The photometric properties of the variable stars located in the lower part of the classical instability strip are discussed. The importance of the determination of some light curve parameters and their connection with the stellar models are stressed, with a particular emphasis on large amplitude Delta Scuti stars.
Pulsation Modes and Fundamental Parameters of Mira Stars
Barthes, D.
Linear pulsation models are generated using the absolute magnitudes of long period variables (LPVs) in the Large Magellanic Cloud (LMC) and in the solar neighborhood (HIPPARCOS parallaxes), as well as effective temperature estimates. The results support the hypothesis that linear modeling may be used provided that a lower mixing length (possibly e…
HIPPARCOS Astrometric Observations of Symbiotic Stars
Badiali, M.; Cardini, D.; Emanuele, A. +1 more
The Hipparcos astrometric satellite has observed a number of symbiotic stars which are also known for being mapped at radio wavelengths. The radio emission generally arises from matter ejected by the binary system, which is made visible by the ionizing radiation of the system's hot component.
Hipparcos has provided the astrometric position (w…