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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
| New uvbybeta photometry of stars of ``astrophysical interest''
Not Available
| Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS
Radial velocities have been determined for a sample of 2930 B2-F5 stars,95% observed by the Hipparcos satellite in the north hemisphere and 80%without reliable radial velocity up to now. Observations were obtainedat the Observatoire de Haute Provence with a dispersion of 80Ä,mm(-1) with the aim of studying stellar and galactic dynamics.Radial velocities have been measured by correlation with templates ofthe same spectral class. The mean obtained precision is 3.0 km s(-1)with three observations. A new MK spectral classification is estimatedfor all stars. Based on observations made at the Haute ProvenceObservatory, France and on data from The Hipparcos Catalogue, ESA.Tables 4, 5 and 6 are only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr or viahttp://cdsweb.u-strasbg.fr/Abstract.htm
| uvby beta Photometry of Stars of "Astrophysical Interest"
Not Available
| δ Scuti stars: a new revised list
An extensive and up to date list of δ Sct stars is presented. Thiscatalogue is intended to be a comprehensive review of observationalcharacteristics of all the δ Sct stars known until now, includingstars contained in earlier catalogues together with other new discoveredvariables, covering information published until November 1993. Globalinformation in the form of histograms and diagrams are also shown.
| RR Lyrae Stars in M14 and M15
It is well known that metallicity plays and important role in the numberand characteristics of RR Lyrae stars in globular clusters. We arecontinuing a program of studying the RR Lyrae stars in globular clustersof varying metallicity: NGC 6388, M14, M15, and M53. We present resultsto date for the metal-poor globular cluster M15 ([Fe/H]=-2.17) andpreliminary result for the somewhat metal-rich globular cluster M14([Fe/H]=-1.39). We have obtained B, V, and R photometry of the RR Lyraestars using the MSU 0.6m and the WIRO 2.3m telescopes. New periods forvariables in M14 have been determined. We also present new lightcurvesfor the RR Lyrae stars in M14 and M15. These will be used to study thefourier decomposition parameters and period changes of the variables.Color-magnitude diagrams for M14 and M15 will also be presented.
| A survey for rapid variability among early main-sequence A stars
A survey of nonpeculiar early (A0-A5) main-sequence A stars for rapid,low-amplitude variability is presented. The survey is also anindependent test of the main-sequence mass-loss theory proposed byWillson et al. (1986). All observations were gathered with theUniversity of Wisconsin Two-Star Photometer. Several period-searchingmethods are used to analyze time series of differential-photometricdata. This instrument coupled with a computerized high-speed datacollection system was used with small telescopes at Pine BluffObservatory and Table Mountain Observatory. Several period-searchmethods are used to analyze time series of differential-photometricdata. This instrument and data-reduction technique allow millimagnitudelight variations to be detected. The survey also discovered severallow-amplitude Delta Sct stars, all of which are in or blueward of therecognized instability strip.
| Four new Delta Scuti stars
Four new Delta Scuti stars are reported. Power, modified into amplitude,spectra, and light curves are used to determine periodicities. Acomplete frequency analysis is not performed due to the lack of asufficient time base in the data. These new variables help verify themany predictions that Delta Scuti stars probably exist in prolificnumbers as small amplitude variables. Two of these stars, HR 4344 and HD107513, are possibly Am stars. If so, they are among the minority ofvariable stars which are also Am stars.
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| קבוצת-כוכבים: | משולש |
| התרוממות ימנית: | 02h02m13.43s |
| סירוב: | +33°24'31.7" |
| גודל גלוי: | 7.982 |
| מרחק: | 294.118 פארסק |
| תנועה נכונה: | -20.9 |
| תנועה נכונה: | -37.9 |
| B-T magnitude: | 8.228 |
| V-T magnitude: | 8.003 |
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