- ID:
- ivo://CDS.VizieR/J/A+A/382/899
- Title:
- BVI photometry in M67
- Short Name:
- J/A+A/382/899
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- File table1 contains various identifications the master list of 977 stars that were included in the photometric variability survey, and which were cross-identified with stars in the study of Fan et al. (1996, Cat. <J/AJ/112/628>). Another 13 stars included in the study, but not cross-identified with the study of Fan et al. can be found in Table 2, which is published in the paper. These 977 stars are those that were included in a roughly square region, 23 arcminutes on each side, centered approximately 5 arcminutes north of the cluster center. The stars have magnitudes in the approximate range 12.5<B<18.5, 12.5<V<18.5, and 12<I<18. File table3 contains BVI photometry for all 990 stars (from Tables 1 and 2) included in the photometric variability study.
Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/J/A+A/462/245
- Title:
- BVI photometry in NGC 6611
- Short Name:
- J/A+A/462/245
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The observation of young stars with circumstellar disks suggests that the disks are dissipated, starting from the inner region, by the radiation of the central star and eventually by the formation of rocky planetesimals, over a time scale of several million years. It was also shown that strong UV radiation emitted by nearby massive stars can heat a circumstellar disk up to some thousand degrees, inducing the photoevaporation of the gas. This process strongly reduces the dissipation time scale. We study whether there exists a correlation between the spatial distribution of stars with circumstellar disks and the position of massive stars with spectral class earlier than B5, in the open cluster NGC 6611. We created a multiband catalog of the cluster, down to V~23mag, using optical data from a WFI observation at 2.2m of ESO in the BVI bands, the 2MASS public point source catalog and an archival X-ray observation made with CHANDRA/ACIS. We selected the stars with infrared excess (due to the emission of a circumstellar disk) using suitable color indices independent of extinction, and studied their spatial distribution.
- ID:
- ivo://CDS.VizieR/J/PASP/115/413
- Title:
- BVI photometry in the open cluster NGC 6791
- Short Name:
- J/PASP/115/413
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present broadband BVI photometry for the open cluster NGC 6791, based upon analysis of 1764 individual CCD images. Data tables listing measured magnitudes and standard errors, image-quality indices, a variability index, and equinox J2000.0 equatorial coordinates for 14,342 stars to V~24 have been made available to the public through the services of the Canadian Astronomy Data Centre. Equatorial coordinates only have been provided for a further 1916 stars, the photometry for which we were unable to calibrate because of lack of color information.
- ID:
- ivo://CDS.VizieR/J/MNRAS/424/1132
- Title:
- BVI photometry of Be 27, Be 24 and Be 36
- Short Name:
- J/MNRAS/424/1132
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In this paper, we present the investigation of the evolutionary status of three open clusters: Berkeley 27, Berkeley 34 and Berkeley 36, all located in the Galactic anticentre direction. All of them were observed with SUperb Seeing Imager 2 at the New Technology Telescope using the Bessel B, V and I filters.
- ID:
- ivo://CDS.VizieR/J/AJ/141/92
- Title:
- BVI photometry of 10 distant open clusters
- Short Name:
- J/AJ/141/92
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The oldest open star clusters are important for tracing the history of the Galactic disk, but many of the more distant clusters are heavily reddened and projected against the rich stellar background of the Galaxy. We have undertaken an investigation of several distant clusters (Berkeley 19, Berkeley 44, King 25, NGC 6802, NGC 6827, Berkeley 52, Berkeley 56, NGC 7142, NGC 7245, and King 9) to develop procedures for separating probable cluster members from the background field. We next created a simple quantitative approach for finding approximate cluster distances, reddenings, and ages. We first conclude that with the possible exception of King 25 they are probably all physical clusters.
- ID:
- ivo://CDS.VizieR/J/A+AS/145/365
- Title:
- BVI photometry of NGC 7790
- Short Name:
- J/A+AS/145/365
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- CCD photometry of the northern open star cluster NGC 7790 has been carried out in BVI photometric passbands down to V~21mag for 1150 stars of which for ~700 stars, the data is obtained for the first time. We derive the most reliable parameters for this cluster using all the available photometric, spectroscopic and proper motion data. The interstellar extinction over the cluster area is uniform and normal with E(B-V)=0.51+/-0.03mag. We determine a distance of 3.3+/-0.23Kpc to the cluster. The theoretical isochrone fittings to the Cepheid variables as well as the evolved part of the main-sequence near turn-off point indicate that the cluster is 120+/-20Myr old. We estimate the cluster radius to be 3.7' using radial stellar density profile. Both the distance and age determined using period luminosity/age relations for the Cepheid variables are consistent with their membership of the cluster. This unique opportunity has therefore been used to refine the zero-point of the period-luminosity relation for the Galactic Cepheids.
- ID:
- ivo://CDS.VizieR/J/MNRAS/377/1737
- Title:
- BVI photometry of NGC 2489
- Short Name:
- J/MNRAS/377/1737
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present CCD BVI photometry for the southern open cluster NGC 2489 and its surrounding field. The sample consists of 2182 stars measured in an area of 13.6'x13.6', extending down to V~21.5. These data are supplemented with CORAVEL radial-velocity observations for seven red giant candidates. A cluster angular radius of 6.7+/-0.6', equivalent to 3.5+/-0.3pc, is estimated from star counts carried out inside and outside the cluster region. The comparison of the cluster colour-magnitude diagrams with isochrones of the Padova group yields E(B-V)=0.30+/-0.05, E(V-I)=0.40+/-0.05 and V-MV=12.20+/-0.25 for logt=8.70 (t=500^+130^_-100_Myr) and Z=0.019. NGC 2489 is then located at 1.8+/-0.3kpc from the Sun and 25pc below the Galactic plane. The analysis of the kinematical data allowed us to confirm cluster membership for six red giants, one of them being a spectroscopic binary. A mean radial velocity of 38.13+/-0.33km/s was derived for the cluster red giants. The properties of a sample of open clusters aligned along the line of sight of NGC 2489 are examined.
- ID:
- ivo://CDS.VizieR/J/MNRAS/335/291
- Title:
- BVI photometry of NGC 2547
- Short Name:
- J/MNRAS/335/291
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have developed the techniques required to use Naylor's optimal photometry algorithm of to create colour-magnitude diagrams with well-defined completeness functions. To achieve this we first demonstrate that the optimal extraction is insensitive to uncertainties in the measured position of the star. We then show how to correct the optimally extracted fluxes such that they correspond to those measured in a large aperture, so aperture photometry of standard stars can be used to place the measurements on a standard system. The technique simultaneously removes the effects of a position-dependent point spread function. Finally, we develop a method called 'ghosting', which calculates the completeness corrections in the absence of an accurate description of the point spread function. We apply these techniques to the young cluster NGC 2547 (=C0809-491), and use an X-ray-selected sample to find an age of 20-35Myr and an intrinsic distance modulus of 8.00-8.15mag. We use these isochrones to select members from our photometric surveys. Our derived luminosity function shows a well-defined Wielen dip, making NGC 2547 the youngest cluster in which such a feature has been observed. Our derived mass function spans the range 0.1-6M_{sun}_ and is similar to that for the field and the older, more massive clusters M35 and the Pleiades, supporting the idea of a universal initial mass function.
- ID:
- ivo://CDS.VizieR/J/MNRAS/367/599
- Title:
- BVI photometry of NGC 5288
- Short Name:
- J/MNRAS/367/599
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In this paper we present charge-coupled device (CCD) images in the Johnson B and V and Kron-Cousins I passbands for the previously unstudied open cluster NGC 5288. The sample consists of 15688 stars reaching down to V~20.5. The cluster appears to have a relatively small but conspicuous nucleus and a low-density extended coronal region.
- ID:
- ivo://CDS.VizieR/J/A+A/381/65
- Title:
- BVI photometry of NGC 2099
- Short Name:
- J/A+A/381/65
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The CCD observations of the rich open star cluster NGC 2099 and its surrounding field region have been carried out up to a limiting magnitude of V~22mag in B, V and I passbands for the first time. A total of ~12000 stars have been observed in the area of about 24'x24' in the cluster region, as well as ~2180 stars in the ~ 12'x12' area of the field region located ~45' away from the cluster center. The cluster parameters determined by fitting the convective core overshoot isochrones in the V, (B-V) and V, (V-I) diagrams are E(B-V)=0.30+/-0.40mag, distance=1360+/-100pc, age=400Myr and metallicity Z=0.008.
