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3891. UBVI photometry of NGC 45 star clusters
ID:
ivo://CDS.VizieR/J/A+A/464/495
Title:
UBVI photometry of NGC 45 star clusters
Short Name:
J/A+A/464/495
Date:
21 Oct 2021
Publisher:
CDS
Description:
Star clusters are present in almost all types of galaxies. Here we investigate the star cluster population in the low-luminosity, unperturbed spiral galaxy NGC 45, which is located in the nearby Sculptor group. Both the old (globular) and young star-cluster populations are studied. Previous ground-based observations have suggested that NGC 45 has few if any "massive" young star clusters. We aim to study the population of lower-mass "open" star clusters and also identify old globular clusters that could not be distinguished from foreground stars in the ground-based data. Star clusters were identified using UBVI imaging from the Advanced Camera for Surveys (ACS) and the Wide Field Planetary Camera 2 (WFPC2) on board the Hubble Space Telescope. From broad band colors and comparison with simple stellar population (SSP) models assuming a fixed metallicity, we derived the age, mass, and extinction. We also measured the radius for each star cluster candidate.
3892. UBVRcIc photometry in fields of Seyfert galaxies
ID:
ivo://CDS.VizieR/J/AN/329/418
Title:
UBVRcIc photometry in fields of Seyfert galaxies
Short Name:
J/AN/329/418
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present UBVRcIc magnitudes of 49 comparison stars in the fields of the Seyfert galaxies Mrk 335, Mrk 79, Mrk 279, Mrk 506, 3C 382, 3C 390.3, NGC 6814, Mrk 304, Ark 564, and NGC 7469 in order to facilitate the photometric monitoring of these objects; 36 of the stars have not been calibrated before. The comparison stars are situated in 5x5arcmin fields centred on the Seyfert galaxies, their V band flux ranges from 11.7 to 18.2mag with a median value of 16.3mag, and their B-V colour index ranges from 0.4 to 1.6mag with a median value of 0.8mag. The median errors of the calibrated UBVRCIC magnitudes are 0.08, 0.04, 0.03, 0.04, and 0.06mag, respectively. Comparison stars were calibrated for the first time in three of the fields (Mrk 506, 3C 382, and Mrk 304). The comparison sequences in the other fields were improved in various aspects. Extra stars were calibrated in four fields (Mrk 335, Mrk 79, NGC 6814, and NGC 7469) most of these stars are fainter and are situated closer to the Seyfert galaxies compared to the existing comparison stars. The passband coverage of the sequences in five fields (Mrk 335, Mrk 79, Mrk 279, NGC 6814, and Ark 564) was complemented with the U band.
3893. UBVRI from the Garching-Bonn Deep Survey
ID:
ivo://CDS.VizieR/J/A+A/441/905
Title:
UBVRI from the Garching-Bonn Deep Survey
Short Name:
J/A+A/441/905
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present first results of our search for high-redshift galaxies in deep CCD mosaic images. As a pilot study for a larger survey, very deep images of the Chandra Deep Field South (CDFS), taken with WFI@MPG/ESO2.2m, are used to select large samples of 1070 U-band and 565 B-band dropouts with the Lyman-break method.
3894. UBVRIJHK photometry of E-type galaxies
ID:
ivo://CDS.VizieR/J/A+A/441/451
Title:
UBVRIJHK photometry of E-type galaxies
Short Name:
J/A+A/441/451
Date:
21 Oct 2021
Publisher:
CDS
Description:
Colour gradients are considered for a sample of circa 50 E-type galaxies in the Local Supercluster. The new data includes isophotal colour profiles in J-H, J-K, V-J and V-K, measured using 2MASS frames mostly from the Large Galaxies Atla s, V frames from previous work and V profiles from the literature. This is supplemented by U-B, B-V, B-R, V-I colour gradients obtained anew from published photometric data. The here available file gives our zero-point colours at r_e_/2 and the measured gradients for 54 objects, but for missing data.
3895. UBVRI phot. in seven Local Group dwarfs galaxies
ID:
ivo://CDS.VizieR/J/AJ/133/2393
Title:
UBVRI phot. in seven Local Group dwarfs galaxies
Short Name:
J/AJ/133/2393
Date:
21 Oct 2021
Publisher:
CDS
Description:
We have obtained UBVRI images with the Kitt Peak National Observatory and Cerro Tololo Inter-American Observatory 4m telescopes and Mosaic cameras of seven dwarfs in (or near) the Local Group, all of which have known evidence of recent star formation: IC 10, NGC 6822, WLM, Sextans B, Sextans A, Pegasus, and Phoenix. We construct color-magnitude diagrams (CMDs) of these systems, as well as neighboring regions that can be used to evaluate the degree of foreground contamination by stars in the Milky Way.
3896. UBVRI photometry in NGC 3367
ID:
ivo://CDS.VizieR/J/AJ/134/142
Title:
UBVRI photometry in NGC 3367
Short Name:
J/AJ/134/142
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report new detailed surface U, B, V, R, and I photometry of 81 stellar structures in the disk of the barred galaxy NGC 3367. The images show many different structures, indicating that star formation is going on in most parts of the disk. NGC 3367 is known to have a very high concentration of molecular gas distribution in the central regions of the galaxy and bipolar synchrotron emission from the nucleus, with two lobes (at 6kpc) forming a triple structure similar to a radio galaxy. We have determined the U, B, V, R, and I magnitudes and U-B, B-V, U-V, and V-I colors for the central region (nucleus), a region which includes supernova 2003 AA, and 79 star associations throughout NGC 3367.
3897. UBVRI photometry in Sextans A
ID:
ivo://CDS.VizieR/J/AJ/116/2341
Title:
UBVRI photometry in Sextans A
Short Name:
J/AJ/116/2341
Date:
21 Oct 2021
Publisher:
CDS
Description:
We investigate the relationship between the spatial distributions of stellar populations and of neutral and ionized gas in the Local Group dwarf irregular galaxy Sextans A. We have resolved various populations of stars via deep UBV(RI)_C imaging over an area with diameter 5.3 arcmin. We arrive at 2525 stars detected in V and at least one other band. We provide here the magnitudes, colors, and absolute positions for the stars.
3898. UBVRI photometry of HDF QSOs and galaxies
ID:
ivo://CDS.VizieR/J/AJ/119/2571
Title:
UBVRI photometry of HDF QSOs and galaxies
Short Name:
J/AJ/119/2571
Date:
21 Oct 2021
Publisher:
CDS
Description:
We have imaged a 45'x45' area centered on the Hubble Deep Field (HDF) in UBVRI passbands, down to the limiting magnitudes of approximately 21.5, 22.5, 22.2, 22.2, and 21.2, respectively. The principal goals of the survey are to identify quasi-stellar objects (QSOs) and to map structure traced by luminous galaxies and QSO absorption line systems in a wide volume containing the HDF. The area surveyed is 400 times as large as that of the HDF, and 40 times as large as that of the HDF Flanking Fields. We have selected QSO candidates from color space and identified four QSOs and two narrow emission line galaxies not yet discovered, bringing the total number of known QSOs in the area to 19.
3899. UBVRI photometry of M33 star clusters. I.
ID:
ivo://CDS.VizieR/J/AJ/144/41
Title:
UBVRI photometry of M33 star clusters. I.
Short Name:
J/AJ/144/41
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present UBVRI photometry for 392 star clusters and candidates in the field of M33, which are selected from the most recent star cluster catalog. In this catalog, the authors listed star clusters' parameters such as cluster positions, magnitudes, colors in the UBVRIJHK_s_filters, and so on. However, a large fraction of objects in this catalog do not have previously published photometry. Photometry is performed using archival images from the Local Group Galaxies Survey, which covers 0.8deg^2^ along the major axis of M33. Detailed comparisons show that, in general, our photometry is consistent with previous measurements. Positions (right ascension and declination) for some clusters are corrected here. Combined with previous literature, ours constitute a large sample of M33 star clusters. Based on this cluster sample, we present some statistical results: none of the youngest M33 clusters (~10^7^yr) have masses approaching 10^5^M_{sun}_; roughly half the star clusters are consistent with the 10^4^-10^5^M_{sun}_ mass models; the continuous distribution of star clusters along the model line indicates that M33 star clusters have been formed continuously from the epoch of the first star cluster formation until recent times; and there are ~50 star clusters which are overlapped with the Galactic globular clusters on the color-color diagram, and these clusters are old globular cluster candidates in M33.
3900. UBVRI photometry of M33 star clusters. II.
ID:
ivo://CDS.VizieR/J/AJ/145/88
Title:
UBVRI photometry of M33 star clusters. II.
Short Name:
J/AJ/145/88
Date:
21 Oct 2021
Publisher:
CDS
Description:
This is the second paper of our series. In this paper, we present UBVRI photometry for 234 star clusters in the field of M33. For most of these star clusters, there is photometry in only two bands in previous studies. The photometry of these star clusters is performed using archival images from the Local Group Galaxies Survey, which covers 0.8deg^2^ along the major axis of M33. Detailed comparisons show that, in general, our photometry is consistent with previous measurements, and in particular that our photometry is in good agreement with that of Zloczewski & Kaluzny. Combined with star cluster photometry in previous studies, we present some results: none of the M33 youngest clusters (~10^7^yr) have masses approaching 10^5^M_{sun}_, and comparisons with models of simple stellar populations suggest a large range of ages for M33 star clusters and some as old as the Galactic globular clusters.

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