- ID:
- ivo://CDS.VizieR/J/A+A/385/471
- Title:
- UBVI photometry of NGC 7036 and NGC 7772
- Short Name:
- J/A+A/385/471
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present CCD UBVI observations obtained in the field of the two previously unstudied dissolving open cluster candidates NGC 7036 and NGC 7772. Our analysis suggests that both the objects are Open Cluster Remnants (OCR). NGC 7036 is an open cluster remnant with a core radius of about 3-4 arcmin. We derive for the first time estimates of its fundamental parameters. We identify 17 likely members that define a group of stars at 1kpc from the Sun, with a low reddening E(B-V)~0.1, and with an age of about 3-4Gyr. As for NGC 7772, we identify 14 likely members, that define a group of stars with a very low reddening (E(B-V)~0.03), are 1.5Gyr old and are located about 1.5kpc from the Sun.
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- ID:
- ivo://CDS.VizieR/J/A+A/387/479
- Title:
- UBVI photometry of NGC 133 and NGC 1348
- Short Name:
- J/A+A/387/479
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present CCD UBVI observations obtained in the field of the previously unstudied northern open clusters NGC 133 and NGC 1348. We argue that NGC 133 is a heavily contaminated cluster, for which we identify 13 candidate members down to V=14.50mag on the basis of the position in the two-color Diagram. Membership has been checked against proper motions from Tycho 2, whenever available. The cluster turns out to have a reddening E(B-V)=0.60+/-0.10mag, to be 630+/-150pc distant from the Sun, and to have an age less than 10Myrs. NGC 1348 is a more reddened clusters (E(B-V)=0.85+/-0.15mag) for which we isolate 20 members. The cluster lies at a distance of 1.9+/-0.5kpc away from the Sun, and has an age greater than 50Myrs. Observations were carried out with the AFOSC camera at the 1.82m Copernico telescope of Cima Ekar (Asiago, Italy), in the photometric night of December 18, 2001.
- ID:
- ivo://CDS.VizieR/J/A+A/374/504
- Title:
- UBVI photometry of NGC 7654 (M52)
- Short Name:
- J/A+A/374/504
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- CCD UBVIc photometry in a wide field around the open cluster NGC 7654 has been carried out for ~17860 stars, down to V~20. The reddening across the cluster region is found to be variable with E(B-V) from 0.46mag to 0.80mag. The cluster is situated at a distance of 1380+/-70pc. The colour magnitude diagrams show a large age spread in the ages. Star formation was biased towards relatively higher masses during the early phase of star formation whereas most of the low mass stars of the cluster were formed during the later phase. The star formation seems to have been a gradual process that proceeded sequentially in mass and terminated with the formation of most massive stars. The present data do not support a uniform mass function (MF) for different regions in the cluster.
- ID:
- ivo://CDS.VizieR/J/MNRAS/408/1147
- Title:
- UBVI photometry of 4 open clusters
- Short Name:
- J/MNRAS/408/1147
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present CCD photometry in the Johnson UBV and Kron-Cousins I systems down to V~22.0 for the open clusters NGC 2311, Trumpler 6, NGC 2432 and BH 54 and their surrounding fields. Trumpler 6 and BH 54 have never been studied before and so we provide, for the first time, estimates of their fundamental parameters. We obtained colour-magnitude diagrams (CMDs) and colour-colour diagrams cleaned from field star contamination by statistically subtracting stars in terms of spatial density, magnitude and colour distributions. Cluster angular radii were estimated from star counts in appropriate-sized boxes distributed throughout the entire observed fields. Using the cleaned CMDs and colour-colour diagrams, we applied sound photometric membership criteria to discriminate cluster members from interloper field stars. The interstellar extinction across the cluster fields derived from the 100-{mu}m dust emission full-sky maps can be considered uniform within the quoted uncertainties. The E(B-V) and E(V-I) colour excesses and the apparent distance moduli of the clusters were estimated from the fit of the zero-age main-sequence to the colour-colour diagrams and CMDs, respectively. Cluster ages were determined from the comparison of the four clusters' CMDs with solar metallicity theoretical isochrones of the Geneva group. All the clusters were found to be moderately young objects, their ages ranging between 60 and 250Myr.
- ID:
- ivo://CDS.VizieR/J/MNRAS/402/2720
- Title:
- UBVI photometry of 5 open clusters
- Short Name:
- J/MNRAS/402/2720
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have obtained CCD UBVI_KC_ photometry down to V~21.0 for the open clusters Berkeley 26, Czernik 27, Melotte 72, NGC 2479 and BH 37. The latter has never been studied before. Cluster stellar density profiles were obtained from star counts in appropriate-sized boxes distributed throughout the entire observed fields. Based on different measured indices, we estimate the ages of Berkeley 26, Melotte 72 and NGC 2479. On the other hand, we indicate possible solutions for the cluster fundamental parameters by matching theoretical isochrones which reasonably reproduce the main cluster features in their colour-magnitude diagrams. In the case of NGC 2479, the cluster E(BV) and E(VI) colour excesses and apparent distance modulus were estimated from the fit of the zero-age main sequence to the colour-colour and colour-magnitude diagrams, respectively.
- ID:
- ivo://CDS.VizieR/J/MNRAS/428/502
- Title:
- UBVI photometry of 7 open clusters
- Short Name:
- J/MNRAS/428/502
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- New photometric material is presented for six outer disc supposedly old, Galactic star clusters: Berkeley 76, Haffner 4, Ruprecht 10, Haffner 7, Haffner 11 and Haffner 15, which are projected against the rich and complex Canis Major overdensity at 225{deg}<=l<=248{deg}, -7{deg}b<=-2{deg}. This CCD data set, in the UBVI passbands, is used to derive their fundamental parameters, in particular age and distance. Four of the program clusters turn out to be older than 1Gyr. This fact makes them ideal targets for future spectroscopic campaigns aiming at deriving their metal abundances. This, in turn, contributes to increase the number of well-studied outer disc old open clusters. Only Haffner 15, previously considered an old cluster, is found to be a young, significantly reddened cluster, member of the Perseus arm in the third Galactic quadrant. As for Haffner 4, we suggest an age of about half a Gyr. The most interesting result we found is that Berkeley 76 is probably located at more than 17kpc from the Galactic centre, and therefore is among the most peripherical old open clusters so far detected. Besides, for Ruprecht 10 and Haffner 7, which were never studied before, we propose ages larger than 1Gyr. All the old clusters of this sample are scarcely populated and show evidence of tidal interaction with the Milky Way, and are therefore most probably in advanced stages of dynamical dissolution.
- ID:
- ivo://CDS.VizieR/J/A+A/325/987
- Title:
- UBV magnitude of NGC 884 B-type pulsators
- Short Name:
- J/A+A/325/987
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of the photometric CCD search for B-type pulsators in the central region of Chi Persei (NGC 884) open cluster. In addition to the two newly-discovered Beta Cephei stars we found 11 other variables in the observed field. The photometric data for them are given in the file 'bmag' and 'vmag' for B and V-filter data, respectively. In addition, we present the new UBV magnitudes for stars in the observed field. This is Table 4 of the paper, available only in electronic form.
- ID:
- ivo://CDS.VizieR/J/AcA/41/167
- Title:
- UBV photometry in Berkeley 32
- Short Name:
- J/AcA/41/167
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- CCD photometry on the UBV and Washington systems, is presented for Be32, a so far unstudied rich open cluster located in the Galactic anticentre. Morphology of cluster and colour-magnitude diagram indicates that it is an old object with age close to ages of NGC 188 and NGC 2243 (about 6Gyr on the scale of VandenBerg isochrones). The cluster reddening is E(B-V)=0.16 and the estimated metallicity is [Fe/H]=-0.37+/-0.05. The apparent distance modulus is between 12.8 and 13.1.
- ID:
- ivo://CDS.VizieR/J/ApJS/93/187
- Title:
- UBV Photometry in NGC 7419
- Short Name:
- J/ApJS/93/187
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- UBV CCD photometry has been carried out on the heavily reddened (A_V_=6.7) Cepheus open cluster NGC 7419. An age of 14+/-2 Myr and a distance of 2.3kpc have been derived using the isochrones of Maeder. The mass function of the cluster satisfies the Salpeter from n(M)~M^-{gamma}^ with {gamma}=2.25. The cluster is dynamically relaxed.
- ID:
- ivo://CDS.VizieR/J/AJ/106/1547
- Title:
- UBV photometry in NGC 7044
- Short Name:
- J/AJ/106/1547
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the photometric analysis for the open cluster NGC 7044, based on Johnson-Cousins UBVR CCD photometry of 896 stars in a region of 4'20"x4'20" in the cluster field.
