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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
| YY Canis Minoris: Contact or near contact system?
New V photoelectric observations of the eclipsing system YY CMi,obtained at La Silla, Chile, and Merate Observatory, Italy, arepresented. New times of minima and ephemeris based on our observationsare also given. The V light curve was analysed by using the WD code toderive the geometrical and physical parameters of the system. Since nospectroscopic mass ratio is available, the q-search method was appliedto yield the preliminary range of the mass ratio in order to search forthe final solution. First the unspotted solution was carried out byusing the unperturbed parts of the light curve and applying the DCprogram of the WD code. The solution was performed by assuming contact(mode 3) and semi-detached (mode 4) configuration, since noclassification of the system is possible from the shape of the lightcurve. The solution in mode 4 does not lead to an acceptable model,since the secondary was found to be slightly overcontact. Therefore thecontact solution was finally adopted. Moreover the light curvepeculiarities (Max II fainter than Max I and excess of light around thephase 0.32) were explained by assuming a cool and a hot spot on thesurface of the secondary (cooler) component. The degree of contact isvery small (f~ 3%) and the thermal contact is poor (T_1-T_2)~ 650 K.These results together with the high photometric mass ratio q~ 0.89indicate that YY CMi is very probably a system at the beginning or theend of the contact phase. Based on observations partly made at theEuropean Southern Observatory (ESO). Table 1 is only available inelectronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr(130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html
| 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.
| The delta Scuti star BI Canis Minoris (identically equals HD 66853): Pulsational behavior and a critical discussion of physical parameter determination
A two site photometric campaign on the delta Scuti star BI CMi (2302 Vobservations over 16 nights) has allowed us to detect unambiguously fourpulsation frequencies nul = 8.246, nu2 = 8.865,nu3 = 7.433 and nu4 = 8.515 c/d) with amplitudesbetween 22 and 5 mmag. The data also show the presence of the nonlinearcoupling term nu1 + nu2, the 2 nu1 termand the possible presence of two other frequencies with amplitudes of2-3 mmag. Other components with further smaller amplitudes are probablypresent, but the data do not allow reliable identifications. We discussthe identification of the pulsation modes in term of nonradical p modes,and we also point out the uncertainties on these identificationassociated to the physical parameter estimates. The possiblemicrovariability of HD 67028, one of the two comparison stars, is alsodiscussed.
| Occultations of stars by solar system objects. VIII - Occultations of catalog stars by asteroids, planets, Titan, and Triton in 1990 and 1991
Predictions are given for occultations of catalog stars by asteroids,planets, Titan, and Triton in 1990 and 1991. The predictions are basedon a computerized comparison of the occulting bodies' ephemerides andnine major star catalogs. The search is complete for all numberedasteroids whose angular diameters exceed 0.08 arcsec during the searchyears. Preliminary ground tracks are shown for the more favorableoccultations.
| A New Variable Star BD +2 1867
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Группы:
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Наблюдательные данные и астрометрия
| Созвездие: | Малый Пёс |
| Прямое восхождение: | 08h06m14.68s |
| Склонение: | +01°29'00.7" |
| Видимая звёздная величина: | 8.822 |
| Собственное движение RA: | -9.6 |
| Собственное движение Dec: | 3.5 |
| B-T magnitude: | 9.001 |
| V-T magnitude: | 8.837 |
Каталоги и обозначения:
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