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16121. UBVI photometry of 4 open clusters
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.
16122. UBVI photometry of 5 open clusters
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.
16123. UBVI photometry of 7 open clusters
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.
16124. UBVI photometry towards (l=314,b=0)
ID:
ivo://CDS.VizieR/J/A+A/536/A101
Title:
UBVI photometry towards (l=314,b=0)
Short Name:
J/A+A/536/A101
Date:
21 Oct 2021
Publisher:
CDS
Description:
The spiral structure of the Milky Way is nowadays receiving renewed attention thanks to the combined efforts of observational campaigns in different wavelength regimes, from the optical to the radio. We start in the paper the exploration of a number of key sectors (line of sights) in the inner Milky Way, where the spiral structure is still poorly known. We search for density enhancements of young stars that might plausibly be associated with spiral structure. To this aim we collect sufficiently wide-field UBVI photometry to allow us to probe in statistical sense the distribution in reddening and distance of young stars in the field. The intensive usage of U-band photometry - although heavily demanding in terms of observational efforts - ensures robust determination of reddening and hence distance for stars of spectral type earlier than A0, which are well-known spiral arm tracers, even though no spectroscopic information are available. The fields we use are large enough to include in most cases well-studied Galactic clusters, which we use as bench-marks to assess the quality and standardisation of the data, and to validate our method. We focus in this paper on the line of sight to the Galactic longitude l=314{deg}, where previous surveys already detected H{alpha} emitters at different standard of rest velocities, and hence distances. The difficulty, however, to translate velocity into distance make predictions on the spiral structure quite vague. First of all, we made exhaustive tests to show that our data-set is in the standard system, and calibrated our method using the two open clusters NGC 5617 and Pismis 19 which happen to be in the field, and for which we found estimates of the basic parameters in full agreement with the literature. We then applied the method to the general field stars and detected signatures of three different groups of stars, evenly distributed across the field of view, at 1.5^+0.5^_-0.2_, 2.5^+0.3^_-0.5_, and 5.1^+1.5^_-1.1_kpc, respectively. These distances are compatible with the location of the nowadays commonly accepted description of the Carina-Sagittarius and Scutum-Crux arms, at heliocentric distance of ~2 an 5kpc, respectively. As a consequence, we consider these groups to be good candidates to trace the location of these two inner arms. In line with previous studies, this investigation demonstrates once again how powerful the use of U-band photometry is to characterize ensembles of young stars, and make predictions on the spiral structure of the Milky Way.
16125. UBV K Stars South Galactic Pole
ID:
ivo://CDS.VizieR/III/151
Title:
UBV K Stars South Galactic Pole
Short Name:
III/151
Date:
21 Oct 2021
Publisher:
CDS
Description:
B and V photographic photometry is collected for approximately 2000 stars near the south galactic pole with 0.8<B-V<1.20; v<19.0, and B<20.06. Velocities with respect to the local standard of rest are provided for approximately 500 K dwarfs and K giants. table8.dat contains photometry in 11.5 square degrees towards the South Galactic Pole, derived from UK Schmidt data, and table9.dat contains photometric data over 0.72 square degrees, derived from 4 B and 3 V plates from Las Campanas Observatory. table10.dat, table11.dat and table12.dat contain velocities for dwarf stars.
16126. UBV observations in globular NGC 1904
ID:
ivo://CDS.VizieR/J/A+AS/26/353
Title:
UBV observations in globular NGC 1904
Short Name:
J/A+AS/26/353
Date:
21 Oct 2021
Publisher:
CDS
Description:
The BV photometric investigation of the Southern globular cluster NGC 1904 was carried out using the 1m telescope of Cerro Las Campanas (CARSO, 2 nights in February 1973 and 2 nights in April 1973), and the 1m telescope at la Silla (ESO, 4 nights in February 1975). The identification of the stars was made by B. Skiff (Lowell Obs.) in October 2010.
16127. UBV Photoelectric Catalog: data 1953-1985
ID:
ivo://CDS.VizieR/II/122B
Title:
UBV Photoelectric Catalog: data 1953-1985
Short Name:
II/122B
Date:
21 Oct 2021
Publisher:
CDS
Description:
The catalogue collects all UBV photoelectric photometry data published since 1953 to the end of 1985 in the Johnson and Morgan system. In addition, data obtained in closely related systems using UBV filters have also been collected. All the data have been merged, yielding a final catalogue of 136719(*) entries concerning 87267 stars and components. The data have been taken from 1413 (UBV) and 127 (other) references found in 73 different periodicals. Great care has been taken to detect and correct all kinds of errors. (*) Two entries have been deleted in version 'B' of this catalogue The analysis of the data is published in 1987A&AS...71..119M
16128. UBV photoelectric photometry of Cepheids
ID:
ivo://CDS.VizieR/II/308
Title:
UBV photoelectric photometry of Cepheids
Short Name:
II/308
Date:
22 Feb 2022
Publisher:
CDS
Description:
The catalog contains approximatively 10,000 photoelectric observations of Cepheid variable stars, observed by the authors or derived from published data. The catalog contains data on more than 300 stars; of these approximately 230 can be classified as "well-observed".
16129. UBV Photoelectric Sequences in SA 92-115
ID:
ivo://CDS.VizieR/VI/19
Title:
UBV Photoelectric Sequences in SA 92-115
Short Name:
VI/19
Date:
21 Oct 2021
Publisher:
CDS
Description:
The UBV system was originally defined by ten bright standard stars, primarily in the northern sky. These stars are too bright to be used with large telescopes and cannot be reached from southern observatories. This catalog is a careful compilation of data on fainter stars in the equatorial Selected Areas. They are intended as a new set of standards which can be used to define the UBV system at fainter magnitudes in both hemispheres. The stars range in V between 6.0 and 14.9 with most between 9.0 and 13.0.
16130. UBV photometry and ages of Trapezium systems
ID:
ivo://CDS.VizieR/J/ApJ/541/841
Title:
UBV photometry and ages of Trapezium systems
Short Name:
J/ApJ/541/841
Date:
21 Oct 2021
Publisher:
CDS
Description:
We sought to determine the maximum age of Trapezium systems by studying possible trapezium systems that were selected independently of their occurrence in H II regions. We started with the unpublished catalog by Allen, Tapia & Parrao (1977RMxAA...3..119A) of all the known visual systems having three or more stars in which the maximum separation is less than 3.0 times the minimum separation. Their catalog has 968 such systems whose most frequent primary type is F, which does not describe young systems. With a CCD on the Kitt Peak 0.9m telescope we obtained UBV frames for 265 systems accessible with our equipment on Kitt Peak. The frames were used to obtain UBV photometry for about 1500 stars with an accuracy of 0.04mag between V=7 and 14mag. Also these frames were used to obtain astrometry with an accuracy of +/-0.015{deg} in position angle and +/-0.01" in separation. For the brightest star in each system we obtained a spectral type to determine the distance and reddening to the system.

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