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Spectroscopic survey of ASAS eclipsing variables: search for chromospherically active eclipsing binary stars - I
We have started a spectroscopic survey to identify new chromosphericallyactive components and low-mass pre-main sequence (PMS) stars in recentlydiscovered All Sky Automated Survey (ASAS) eclipsing binaries. In thispaper, we briefly describe our scientific motivation, the observingtools and the results obtained from the first phase of this survey.Using the available observing facilities in India, the spectroscopicobservations of a sample of 180 candidate eclipsing binary starsselected from ASAS-I&II releases were carried out during 2004-2006.The strength of H? emission was used to characterize the level ofchromospheric activity. Our spectroscopic survey reveals that out of 180stars about 36 binary systems show excess H? emission. One of theobjects in our sample, ASAS 081700-4243.8, displays very strong H?emission. Follow-up high-resolution spectroscopic observations revealthat this object is indeed very interesting and most likely a classicalBe-type system with K0III companion.
| A catalogue of eclipsing variables
A new catalogue of 6330 eclipsing variable stars is presented. Thecatalogue was developed from the General Catalogue of Variable Stars(GCVS) and its textual remarks by including recently publishedinformation about classification of 843 systems and making correspondingcorrections of GCVS data. The catalogue1 represents thelargest list of eclipsing binaries classified from observations.
| The 74th Special Name-list of Variable Stars
We present the Name-list introducing GCVS names for 3153 variable starsdiscovered by the Hipparcos mission.
| A large, complete, volume-limited sample of G-type dwarfs. I. Completion of Stroemgren UVBY photometry
Four-colour photometry of potential dwarf stars of types G0 to K2,selected from the Michigan Spectral Catalogues (Vol. 1-3), has beencarried out. The results are presented in a catalogue containing 4247uvby observations of 3900 stars, all south of δ = -26deg. Theoverall internal rms errors of one observation (transformed to thestandard system) of a program star in the interval 8.5 < V < 10.5are 0.0044, 0.0021, 0.0039, and 0.0059, respectively, in V, b-y, m_1_ ,and c_1_. The purpose of the catalogue, combined with earliercatalogues, is to allow selection of a large, complete, volume-limitedsample of G- and K-type dwarfs, investigate their metallicitydistribution, and compare it to predictions of various models ofgalactic chemical evolution. Future papers in this series will discussthese subjects.
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