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The catalog of short periods stars from the “Pi of the Sky” data
Based on the data from the “Pi of the Sky” project we made acatalog of the variable stars with periods from 0.1 to 10 days. We useddata collected during a period of two years (2004 and 2005) andclassified 725 variable stars. Most of the stars in our catalog areeclipsing binaries 464 (about 64%), while the number of pulsatingstars is 125 (about 17%). Our classification is based on the shape ofthe light curve, as in the GCVS catalog. However, some stars in ourcatalog were classified as of different type than in the GCVS catalog.We have found periods for 15 stars present in the GCVS catalog withpreviously unknown period.
| Multiperiodicities from the Hipparcos epoch photometry and possible pulsation in early A-type stars
A selection criterion based on the relative strength of the largestpeaks in the amplitude spectra, and an information criterion are used incombination to search for multiperiodicities in Hipparcos epochphotometry. The method is applied to all stars which have beenclassified as variable in the Hipparcos catalogue: periodic, unsolvedand microvariables. Results are assessed critically: although there aremany problems arising from aliasing, there are also a number ofinteresting frequency combinations which deserve further investigation.One such result is the possible occurrence of multiple periods of theorder of a day in a few early A-type stars. The Hipparcos catalogue alsocontains a number of these stars with single periodicities: such starswith no obvious variability classifications are listed, and informationabout their properties (e.g., radial velocity variations) discussed.These stars may constitute a new class of pulsators.
| V802 Aquilae and V854 Scorpii : Two Neglected High Amplitude delta Scuti Stars
To test the observational limits of the David Derrick Telescope in theOrson Pratt Observatory at Brigham Young University a number of faint,southern, high amplitude δ Scuti stars were observed. These starsranged in declination from -03 to -32 and in V magnitude from 7.5 to14.5. The stars used for this test were HY Librae, V976 Scorpii, V703Scorpii, V802 Aquilae, and V854 Scorpii. Results from two of thesestars, V802 Aql and V854 Sco, will be presented. Early reductions seemto indicate that V802 Aql is not a member of the HADS group.
| A revised catalogue of delta Sct stars
An extensive and up-dated list of delta Sct stars is presented here.More than 500 papers, published during the last few years, have beenrevised and 341 new variables have been added to our last list, sixyears ago. This catalogue is intended to be a comprehensive review onthe observational characteristics of all the delta Sct stars known untilnow, including stars contained in earlier catalogues together with othernew discovered variables, covering information published until January2000. In summary, 636 variables, 1149 references and 182 individualnotes are presented in this new list. Tables 1 and 2 will be accessibleonly in electronic form at the CDS via anonymous ftp tocdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html
| The 74th Special Name-list of Variable Stars
We present the Name-list introducing GCVS names for 3153 variable starsdiscovered by the Hipparcos mission.
| SANTIAGO 91, a right ascension catalogue of 3387 stars (equinox J2000).
The positions in right ascension of 3387 stars belonging to the Santiago67 Catalogue, observed with the Repsold Meridian Circle at Cerro Calan,National Astronomical Observatory, during the period 1989 to 1994, aregiven. The average mean square error of a position, for the wholeCatalogue, is +/-0.009 s. The mean epoch of the catalogue is 1991.84.
| Estimation of spectral classifications for bright southern stars with interesting Stromgren indices
This paper investigates the degree of success with which uvby photometrycan be applied to predict spectral classifications for 947 A, F, and Gstars brighter than an apparent magnitude of 8.3 and with four-colorindices indicating some kind of interesting, unusual, or peculiarspectrum. One or several possible spectral classifications are estimatedfor each star from photometry alone, double stars are distinguished, andthe estimates are compared with published classifications. The resultsshow that the framework provided by uvby photometry can be extended toinclude most G and K stars, reddened stars, peculiar stars, and certaintypes of double star.
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Datos observacionales y astrométricos
| Constelación: | Libra |
| Ascensión Recta: | 15h04m01.97s |
| Declinación: | -28°03'41.4" |
| Magnitud Aparente: | 7.724 |
| Distancia: | 164.204 parsecs |
| Movimiento Propio en Ascensión Recta: | 20.5 |
| Movimiento Propio en Declinación: | -6 |
| B-T magnitude: | 8.311 |
| V-T magnitude: | 7.773 |
Catálogos y designaciones:
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