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16161. UBVRIJHK photometry of Dolidze 25
ID:
ivo://CDS.VizieR/J/A+A/509/A104
Title:
UBVRIJHK photometry of Dolidze 25
Short Name:
J/A+A/509/A104
Date:
21 Oct 2021
Publisher:
CDS
Description:
The analysis of our deep UBVRIJHK photometry of Dolidze 25, located in the central area of the HII region Sh 2-284, reveals a young cluster with coeval MS and PMS populations of age 3.2-5Myr. The mass function for the optical PMS population in the mass range above 1.3-3.5M_{sun}_ is well fitted by a Salpeter mass function. On the other hand, the NIR photometry results indicate a large number of sources with H-Ks excess, practically distinct from the optical PMS candidate members. In addition, a distinctly older cluster member population of age 40Myr is suggested. The distance determined for the cluster from quantitative fits to ZAMS and isochrones (3.6kpc) is distinctly lower than previously published values. This result originates in the consistent use of low metallicity models for ZAMS fitting, applying published metallicity values for the cluster
16162. 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.
16163. UBVRIJHK photometry of RR Lyrae in M4
ID:
ivo://CDS.VizieR/J/PASP/126/521
Title:
UBVRIJHK photometry of RR Lyrae in M4
Short Name:
J/PASP/126/521
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present optical and near-infrared UBVRIJHK photometry of stars in the Galactic globular cluster M4 (NGC 6121) based upon a large corpus of observations obtained mainly from public astronomical archives. We concentrate on the RR Lyrae variable stars in the cluster, and make a particular effort to accurately reidentify the previously discovered variables. We have also discovered two new probable RR Lyrae variables in the M4 field: one of them by its position on the sky and its photometric properties is a probable member of the cluster, and the second is a probable background (bulge?) object. We provide accurate equatorial coordinates for all 47 stars identified as RR Lyraes, new photometric measurements for 46 of them, and new period estimates for 45. We have also derived accurate positions and mean photometry for 34 more stars previously identified as variable stars of other types, and for an additional five non-RR Lyrae variable stars identified for the first time here. We present optical and near-infrared color-magnitude diagrams for the cluster and show the locations of the variable stars in them. We present the Bailey (period-amplitude) diagrams and the period-frequency histogram for the RR Lyrae stars in M4 and compare them to the corresponding diagrams for M5 (NGC 5904). We conclude that the RR Lyrae populations in the two clusters are quite similar in all the relevant properties that we have considered. The mean periods, pulsation-mode ratios, and Bailey diagrams of these two clusters show support for the recently proposed "Oosterhoff-neutral" classification.
16164. UBVRIJKLMNH Photoelectric Catalogue
ID:
ivo://CDS.VizieR/II/7A
Title:
UBVRIJKLMNH Photoelectric Catalogue
Short Name:
II/7A
Date:
21 Oct 2021
Publisher:
CDS
Description:
The catalog contains the results from star brightness measures in the first ten (UBVRIJKLMN) broad wavelength bands (Johnson 1965) and the additional bandpass H (Johnson et al. 1968). Data in the above system that have been published up to June 1977 are included. The source reference (Morel and Magnenat 1978) states that there are 5943 entries in the data set with data for 4494 stars. However, a count of the records by coded number shows that there are only 4486 unique entries (not 4494). The catalog includes coded identification numbers (Geneva system), 11 magnitudes, numbers of measurements in each filter, and references.
16165. UBVRI light curves of 44 type Ia supernovae
ID:
ivo://CDS.VizieR/J/AJ/131/527
Title:
UBVRI light curves of 44 type Ia supernovae
Short Name:
J/AJ/131/527
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present UBVRI photometry of 44 Type Ia supernovae (SNe Ia) observed from 1997 to 2001 as part of a continuing monitoring campaign at the Fred Lawrence Whipple Observatory of the Harvard-Smithsonian Center for Astrophysics. The data set comprises 2190 observations and is the largest homogeneously observed and reduced sample of SNe Ia to date, nearly doubling the number of well-observed, nearby SNe Ia with published multicolor CCD light curves.
16166. UBVRI linear polarisation in Wolf-Rayet winds
ID:
ivo://CDS.VizieR/J/AJ/159/214
Title:
UBVRI linear polarisation in Wolf-Rayet winds
Short Name:
J/AJ/159/214
Date:
09 Dec 2021
Publisher:
CDS
Description:
Wolf-Rayet (WR) stars have strong, hot winds, with mass-loss rates at least a factor of 10 greater than their O-star progenitors, although their terminal wind speeds are similar. In this paper, we use the technique of multiband linear polarimetry to extract information on the global asymmetry of the wind in a sample of 47 bright Galactic WR stars. Our observations also include time-dependent observations of 17 stars in the sample. The path to our goal includes removing the dominating component of wavelength-dependent InterStellar Polarization (ISP), which normally follows the well-known Serkowski law. We include a wavelength-dependent ISP position angle parameter in our ISP law and find that 15 stars show significant results for this parameter. We detect a significant component of wavelength-independent polarization due to electron scattering in the wind for 10 cases, with most WR stars showing none at the ~0.05% level precision of our data. The intrinsically polarized stars can be explained with binary interaction, large-scale wind structure, and clumping. We also found that 5 stars out of 19 observed with the Stromgren b filter (probing the complex {lambda}4600-4700{AA} emission-line region) have significant residuals from the ISP law and propose that this is due to wind asymmetries. We provide a useful catalog of ISP for 47 bright Galactic WR stars and upper limits on the possible level of intrinsic polarization.
16167. UBVRI mag of 3 Open Cluster Remnants candidates
ID:
ivo://CDS.VizieR/J/A+A/428/67
Title:
UBVRI mag of 3 Open Cluster Remnants candidates
Short Name:
J/A+A/428/67
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present CCD UBVI photometric and medium/high resolution spectroscopic observations obtained in the field of the previously unstudied dissolving open cluster candidates NGC 5385, NGC 2664 and Collinder 21. Our analysis is based on the discussion of star counts, photometry, radial velocity distribution, and proper motions available from the Tycho 2 catalogue (<I/259>). All three aggregates clearly emerge from the mean Galactic field, but, regrettably, the close scrutiny of proper motions and radial velocities reveals that we are not facing any physical group. Instead, what we are looking at are just chance alignments of a few bright unrelated stars. Our analysis casts some doubt on the Bica et al. (2001A&A...366..827B) criterion to look for Possible Open Cluster Remnants. It seems mandatory to define a better criterion to adopt for further investigations.
16168. UBVRI observations of FKSZ stars
ID:
ivo://CDS.VizieR/II/303
Title:
UBVRI observations of FKSZ stars
Short Name:
II/303
Date:
21 Oct 2021
Publisher:
CDS
Description:
(no description available)
16169. 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.
16170. UBVRI Photometric Standards
ID:
ivo://CDS.VizieR/II/183A
Title:
UBVRI Photometric Standards
Short Name:
II/183A
Date:
21 Oct 2021
Publisher:
CDS
Description:
UBVRI photoelectric observations have been made on the Johnson-Kron-Cousins photometric system of 526 stars centered on the celestial equator. The program stars within a 298 number subset have sufficient measures that they are capable of providing, for telescopes of intermediate and large size in both hemispheres, an internally consistent homogeneous broadband standard photometric system around the sky. The stars average 29 measures each on 19 nights. The majority of the stars in this paper fall in the magnitude range 11.5 < V < 16.0, and in the color range -0.3 < (B-V) < +2.3.

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