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1.
N. N. Samus’ O. V. Durlevich A. V. Zharova E. V. Kazarovets N. N. Kireeva E. N. Pastukhova D. B. Williams M. L. Hazen 《Astronomy Letters》2006,32(4):263-273
We present a new electronic version of the third volume of the fourth edition of the General Catalogue of Variable Stars (GCVS) that contains data on 13 855 variables in the constellations Pavo-Vulpecula. The Name Lists of Variable Stars from no. 67 to no. 77 were included in the new version. The main distinctive feature of the new version is that improved J2000.0 equatorial coordinates (including those for 6163 stars corrected for the proper motions) based on the identifications with positional catalogues using finding charts and on our new measurements are presented for 13 812 stars. We searched for a number of stars on original plates from the plate stacks of several observatories and using images from digital sky surveys. Apart from the complete update of the positional information, we made several corrections that were found to be necessary after the publication of the GCVS Volume III (1985) and several corrections of the information about the variability features based on photometry from currently available automatic sky surveys. A number of problem identifications are described in detail. The new version completes our long-term work on the complete revision of the positional information in the GCVS. In the Conclusions, we give a list of references to new Internet resources. 相似文献
2.
L. N. Berdnikov A. Yu. Kniazev V. V. Kravtsov E. N. Pastukhova D. G. Turner 《Astronomy Letters》2009,35(1):39-44
Cepheids, the principal distance indicators, point to the existence of two inner Galactic spiral arms in the immediate solar neighborhood (within 5 kpc). However, the available Cepheids are clearly insufficient for a detailed study of the structure of these arms. Fortunately, southern-sky monitoring (the ASAS project) has led to the discovery of many new variable stars, more than one thousand of which have been identified as possible Cepheids. To improve the classification and to construct reliable light curves for new Cepheids, we have begun their regular photometric observations. Here, we present the first results: 1192 photoelectricBV I c observations were performed for 33 classical Cepheidswith the 76-cm telescope of the South-African Astronomical Observatory (SAAO, the South-African Republic) from December 2006 to January 2008. We provide tables of observations and V light and B-V and V-I c color curves. The new observations together with ASAS-3 data have been used to improve the elements of the light variations. 相似文献
3.
E. V. Kazarovets N. N. Samus’ O. V. Durlevich N. N. Kireeva E. N. Pastukhova G. Pojmanski 《Astronomy Reports》2009,53(11):1013-1019
We present a new electronic version of the General Catalog of Variable Stars (GCVS) based on the new IAU name list of confirmed
variable stars. The catalog contains 1270 stars, most of them contained earlier in the New Catalog of Suspected Variable Stars
or its supplement. A number of recent studies—including those by authors of the catalog, who investigated many stars using
data from modern automatic surveys, determined light-curve elements for periodic stars, and plotted numerous light curves—have
made it possible to move these stars to the GCVS. Among the catalog objects, 24 stars are novae or other unusual variable
stars that acquired their GCVS names out of the usual order, upon communication from the Bureau of Astronomical Telegrams
of the International Astronomical Union. We present the GCVS names, coordinates, classifications (in two forms: the GCVS system
and a new, proposed system), brightness-variation limits, and light-curve elements for the catalog stars, as well as bibliographic
references and remarks when necessary. We discuss several catalog stars that are of astrophysical interest or caused problems
during the compilation of the catalog. 相似文献
4.
Astronomy Letters - The reduction of all the available photometry for the Cepheid ET Vul has allowed its $$O-C$$ diagram spanning a time interval of 130 years to be constructed. This has made it... 相似文献
5.
We have obtained 530 photographic magnitude estimates for the long-period classical Cepheid NSV 9159 (P = 39d) in the plate collections of the Harvard Observatory and the Sternberg Astronomical Institute. Together with the currently available CCD observations from the ASAS-3 catalog, our data have allowed us to construct an O-C diagram spanning a time interval of 119 years. The O-C diagram has the shape of a parabola, which has made it possible to determine for the first time the quadratic light elements and to calculate the rate of evolutionary decrease in the period, 314.4 (±7.3) s yr?1, in agreement with the results of theoretical calculations for the second crossing of the instability strip. The available data reduced by the Eddington-Plakidis method do not reveal any noticeable random fluctuations in the period. 相似文献
6.
7.
Astronomy Letters - For both periods of the double-mode classical Cepheid TU Cas we have constructed $$O-C$$ diagrams spanning a time interval of 117 years. The $$O-C$$ diagrams have the shape of... 相似文献
8.
L. N. Berdnikov A. Yu. Kniazev R. Sefako V. V. Kravtsov E. N. Pastukhova S. V. Zhuiko 《Astronomy Reports》2011,55(9):816-823
In 2008–2010, we obtained 6095 CCD frames in the BV I
c
photometric systemfor 49 classical Cepheids discovered in the ASAS-3 project. The observations were obtained on the 76-cm
telescope of the South African Astronomical Observatory (SAAO, RSA) and the 40-cm telescope of the Cerro Armazones Observatory
of the Catholic University of the North (OCA, Chile), with a SBIGCCD ST-10XME camera. We present tabulated observations, light
curves, and revised elements for the brightness variations. 相似文献
9.
D. G. Turner †‡§ D. Forbes † D. English ‡ P. J. T. Leonard J. N. Scrimger A. W. Wehlau R. L. Phelps † L. N. Berdnikov § E. N. Pastukhova 《Monthly notices of the Royal Astronomical Society》2008,388(1):444-456
Photoelectric, photographic and CCD UBV photometry, spectroscopic observations and star counts are presented for the open cluster Berkeley 58 to examine a possible association with the 4.37 d Cepheid CG Cas. The cluster is difficult to separate from the early-type stars belonging to the Perseus spiral arm, in which it is located, but has reasonably well-defined parameters: an evolutionary age of ∼108 yr, a mean reddening of E ( B − V ) (B0) = 0.70 ± 0.03 s.e. and a distance of 3.03 ± 0.17 kpc ( V 0 − M V = 12.40 ± 0.12 s.d.). CG Cas is a likely cluster coronal member on the basis of radial velocity, and its period increase of +0.170 ± 0.014 s yr−1 and large light amplitude describe a Cepheid in the third crossing of the instability strip lying slightly blueward of strip centre. Its inferred reddening and luminosity are E ( B − V ) = 0.64 ± 0.02 s.e. and 〈 M V 〉=−3.06 ± 0.12 . A possible K supergiant may also be a cluster member. 相似文献
10.
L. N. Berdnikov A. Yu. Kniazev V. V. Kravtsov E. N. Pastukhova D. G. Turner 《Astronomy Letters》2009,35(5):311-320
From December 2006 to January 2008, we performed 1699 BV I c observations for 46 low-amplitude Cepheids discovered in the course of the ASAS project using the 76-cm telescope of the South-African Astronomical Observatory (SAAO). We provide the tables of observations and V light and B-V and V-I c color curves. These new observations, along with data from the ASAS-3 catalog, have been used to improve the elements of the light variations. Our data allow the number of known Galactic low-amplitude Cepheids to be almost doubled. This makes it possible to increase the number of distance indicators suitable for studying the structure of the inner Galactic arms by almost 15%. 相似文献