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Strömgren photometry of the delta Sct star V919 Her.
Preliminary analysis of photometric observations carried out during 2003and 2004 photometric campaigns of the delta Sct-type star V919 Her ispresented. Analysis of the data, using the Fourier transform method,showed that the two dominant frequencies do agree well with the twofrequencies found by Koen (2001). A very complicated frequency spectrumis obtained which suggests the convenience of organizing a coordinatedcampaign to disentangle the frequencies content.
| 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.
| 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.
| UBV photometry of HD stars in the fields of selected cataclysmic variables.
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Membre dels grups següents:
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Dades d'Observació i Astrometria
| Constel·lació: | Hercules |
| Ascensió Recta: | 16h49m31.98s |
| Declinació: | +26°02'05.5" |
| Magnitud Aparent: | 8.362 |
| Distancia: | 411.523 parsecs |
| Moviment propi RA: | 21.6 |
| Moviment propi Dec: | -10.9 |
| B-T magnitude: | 8.728 |
| V-T magnitude: | 8.393 |
Catàlegs i designacions:
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