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Start Over Subject ccd photometry Content Level Research
41. BV Color-Magnitude Diagram for NGC 1851
ID:
ivo://CDS.VizieR/J/PASP/104/1063
Title:
BV Color-Magnitude Diagram for NGC 1851
Short Name:
J/PASP/104/1063
Date:
21 Oct 2021
Publisher:
CDS
Description:
BV photometry is provided for 1,234 stars in the magnitude range 13-18 in an annulus between 5 and 20 arc seconds from the center of NGC 1851 and for 1,247 stars in the magnitude range 18-23 at a distance of more than 240 arc seconds from the center. For stars in the magnitude range 16-21, the errors in B-V increase with magnitude from 0.005 mag. to 0.022 mag. See the document file (walker.txt or walker.tex) by Nancy G. Roman for more details.
42. BVI CCD photometry of Berkeley 17
ID:
ivo://CDS.VizieR/J/ApJ/483/826
Title:
BVI CCD photometry of Berkeley 17
Short Name:
J/ApJ/483/826
Date:
21 Oct 2021
Publisher:
CDS
Description:
Faint magnitude BVI CCD photometry of the central region of the old open cluster Berkeley 17 (Be 17) has been undertaken to investigate the claim that it is the oldest open cluster yet discovered (Phelps, Janes, & Montgomery, 1994AJ....107.1079P). This study reveals Be 17 to have a metallicity -0.30<=[Fe/H]<=0.00; a reddening 0.52<=E(B-V)<=0.68 or 0.61<=E(V-I)<=0.71; a distance modulus, (m-M)_0_=12.15+/-0.10, corresponding to a distance of 2.7+/-0.1kpc; a diameter of ~10pc; a minimum mass of 400 Msun; and an age of 10-13Gyr. With an adopted age of 12(+1)(-2)Gyr, these results suggest that Be 17 is indeed the oldest open cluster yet discovered. The inferred old age for Be 17 indicates that the cluster is an important one for studies of the differences between open and globular clusters, the transition from the halo/thick disk to the thin disk of the Galaxy, and even for establishing the minimum age of the universe.
43. BVI CCD photometry of NGC 7510
ID:
ivo://CDS.VizieR/J/MNRAS/250/683
Title:
BVI CCD photometry of NGC 7510
Short Name:
J/MNRAS/250/683
Date:
21 Oct 2021
Publisher:
CDS
Description:
CCD observations in B, V and I passbands have been used to generate deep V, (B-V) and V, (V-I) colour-magnitude diagrams for the open cluster NGC 7510. The sample consists of 592 stars reaching down to V=21mag. There appears to be non- uniform extinction over the face of the cluster with the value of colour excess, E(B-V), ranging from 1.0 to 1.3mag. The law of interstellar extinction in the direction of the cluster is found to be normal. A broad main sequence is clearly visible in both colour-magnitude diagrams. From the bluest part of the colour-magnitude diagrams, the true distance modulus to the cluster has been estimated as 12.5+/-0.3mag and an upper limit of 10 Myr has been assigned for the cluster age.
44. BVI CCD photometry of Sextans dSph galaxy
ID:
ivo://CDS.VizieR/J/AJ/126/2840
Title:
BVI CCD photometry of Sextans dSph galaxy
Short Name:
J/AJ/126/2840
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present deep wide-field VI CCD photometry of the Sextans dwarf spheroidal galaxy (dSph) in the Local Group, covering a field of 42'x28' located at the center of the galaxy (supplemented by short B photometry). The limiting magnitudes with 50% completeness are V=24.4mag and I=23.6mag.
45. BVI_c_ light curves of 57 Cepheids
ID:
ivo://CDS.VizieR/J/PAZh/40/147
Title:
BVI_c_ light curves of 57 Cepheids
Short Name:
J/PAZh/40/147
Date:
21 Oct 2021
Publisher:
CDS
Description:
In 2008-2013, we obtained 11333 CCD BV Ic frames for 57 Cepheids from the General Catalogue of Variable Stars. We performed our observations with the 76-cm telescope of the South AfricanAstronomicalObservatory (SAAO, South Africa) and the 40-cm telescope of the Cerro Armazones Astronomical Observatory of the Universidad Catolica del Norte (OCA, Chile) using the SBIG ST-10XME CCD camera. The tables of observations, the plots of light curves, and the current light elements are presented. Comparison of our light curves with those constructed from photoelectric observations shows that the differences between their mean magnitudes exceed 0.05mag in 20% of the cases. This suggests the necessity of performing CCD observations for all Cepheids.
46. BVIc light curves of 8 RR Lyr-type stars
ID:
ivo://CDS.VizieR/J/other/Obs/131.386
Title:
BVIc light curves of 8 RR Lyr-type stars
Short Name:
J/other/Obs/131.
Date:
21 Oct 2021
Publisher:
CDS
Description:
We took a total of 1175 B, V, and Ic-band CCD frames for 11 GCVS RR Lyr-type variables, for which only the coordinates were known. Observations were made with the 76-crn telescope of the South African Astronomical Observatory. We confirm the variability types, determine the periods, and build the light curves for five objects: BL Aps (P=0.598d), GR Pav (P=0.583d), HI Pav (P=0.643d), HZ Pav (P=0.803d), and IR Pav (P=0.561d). The objects SY Aps (P=0.279d) and IV Pav (P=0.408d) proved to be W UMa-type eclipsing variables; TW Aps (P=0.149d), an SX Phe-type variable; TT Aps (P=482d), an SRD-type semiregular variable, and SW Aps and GI Pav, constant stars.
47. BVI(c) light curves of variables in M3
ID:
ivo://CDS.VizieR/J/MNRAS/372/1657
Title:
BVI(c) light curves of variables in M3
Short Name:
J/MNRAS/372/1657
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present time-series data on the variable stars of the galactic globular cluster Messier 3 (M3). We give BVI_C_ light curves for 226 RR Lyrae, 2 SX Phe and 1 W Vir type variables, along with estimated fundamental photometric parameters such as intensity and magnitude-averaged brightness and pulsation periods. In some cases, the periods we have found significantly differ from the previously published ones. This is the first published light curve and period determination for variable V266. The I-band light curve has not been observed previously for numerous (76) variables. Three new RR Lyrae variables have been discovered. Groups of RR Lyrae variables that belong to different evolutionary stages and have been separated previously on the basis of V data were found here for all colours and colour indices by cluster analysis. The I-band period-luminosity relation is also discussed. From the 66 modulated (Blazhko type) RR Lyrae stars we investigated, six are newly identified and two of them are first overtone pulsators. In the case of 13 RR Lyrae, the period of Blazhko cycle has been estimated for the first time. V252 is identified as a new RRd variable. Amplitude ratios of RRd stars have been investigated to search possible mode content changes. In contrast to previous publications no changes have been found. Problems with the sampling of the time-series of typical cluster variability surveys are demonstrated.
48. BVIc photometry in Lynga 11
ID:
ivo://CDS.VizieR/J/other/NewA/11.262
Title:
BVIc photometry in Lynga 11
Short Name:
J/other/NewA/11.
Date:
21 Oct 2021
Publisher:
CDS
Description:
We have obtained CCD BVI_KC_ photometry down to V~21.5 for the open cluster Lynga 11 and its surrounding field. This previously unstudied object appears to be rich and highly absorbed. A cluster angular radius of 4.5+/-0.5, equivalent to (3.0+/-0.3)pc, is estimated from star counts in 100-pixel a side boxes distributed throughout the whole observed field. Our analysis suggests that Lynga 11 is moderately young and probably of solar metallicity.
49. BVIc photometry in NGC 2976
ID:
ivo://CDS.VizieR/J/AN/322/73
Title:
BVIc photometry in NGC 2976
Short Name:
J/AN/322/73
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present BVIc photometry of the brightest stars and compact star clusters in NGC 2976, a dwarf galaxy in the interacting M81/M82 group. Deep CCD images of the galaxy were obtained with the 6m-Telescope of the Special Astrophysical Observatory (Russia) at arcsec resolution. About 290 young stars and concentrated young clusters were measured. Supplementaxy data in the ultraviolet are taken from the literature. The extinction to the measured objects is comparatively low, E(B-V)~0.15-0.20mag. We estimate the ages of youngest resolved stars and concentrated star clusters to be ~5x10^6^years. This population is concentrated in a broad stripe facing M81. In the central disk the population is a bit older, about 8x10^6^years, this may be a hint to an outward spreading star formation process. The metallicity of the disk population is estimated as solar (z~0.02) from a fitting to Padova theoretical stellar isochrones.
50. BVIc photometry of Cepheids from ASAS-3 catalog
ID:
ivo://CDS.VizieR/J/AZh/88/886
Title:
BVIc photometry of Cepheids from ASAS-3 catalog
Short Name:
J/AZh/88/886
Date:
21 Oct 2021
Publisher:
CDS
Description:
In 2008-2010, we obtained 6095 CCD frames in the BVIc photometric system for 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.

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