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7171. UBV photometry of Pleione in 1991-1996
ID:
ivo://CDS.VizieR/J/PAZh/23/113
Title:
UBV photometry of Pleione in 1991-1996
Short Name:
J/PAZh/23/113
Date:
21 Oct 2021
Publisher:
CDS
Description:
The photoelectric UBV observations of Pleione between 1991 and 1996 are reported.
7172. UBV photometry of selected regions in the MCs
ID:
ivo://CDS.VizieR/II/232
Title:
UBV photometry of selected regions in the MCs
Short Name:
II/232
Date:
21 Oct 2021
Publisher:
CDS
Description:
This catalogue groups broad-band CCD photometry made in 8 regions of the Magellanic Clouds which were used for the study of stellar populations in the Magellanic Clouds. The photometry yielded 293693 BV entries with 136155 having additional U information, published or to be published in 4 different papers.
7173. UBV photometry of SGP AGNs
ID:
ivo://CDS.VizieR/J/A+AS/140/351
Title:
UBV photometry of SGP AGNs
Short Name:
J/A+AS/140/351
Date:
21 Oct 2021
Publisher:
CDS
Description:
Spectra, position, magnitudes and colors are presented for 485 faint (B_J_<20.5) emission line objects selected with the ultraviolet-excess (UVX) criterion on a area of 24.6 sq. deg. in the South Galactic Pole. The objects were selected from the analysis of pixel-to-pixel stacking of COSMOS scans of UKST U_J_ and R plates. The candidates were observed with the Meudon-ESO Fiber Optics System (MEFOS) at the ESO 3.6m telescope. 429 type 1 AGNs have been identified (373 in the redshift range 0.3<z<=2.2). This sample has allowed the measure of a difference on the QSO clustering evolution in comparison with that found for galaxies (La Franca et al., 1998ApJ...497..529L). The region is part of the ESO Imaging Survey (EIS) and of the 2dF QSO redshift survey.
7174. UBV photometry of Shorlin 1
ID:
ivo://CDS.VizieR/J/A+A/493/71
Title:
UBV photometry of Shorlin 1
Short Name:
J/A+A/493/71
Date:
21 Oct 2021
Publisher:
CDS
Description:
The detailed spiral structure of the outer Galactic disk remains poorly constrained, and for several line of sights in the Galaxy we depend on model extrapolations. One of these regions is the fourth Galactic quadrant, between Vela and Carina (270{deg}<=l<=300{deg}), where, apart from the conspicuous Carina branch of the Carina Sagittarius arm, no spiral arms have been detected so far in the optical beyond l~270{deg}. By means of deep UBVI photometry, we search for spiral features in known low absorption windows. Although observationally demanding, U photometry constitutes a powerful tool for detecting and characterizing distant aggregates of young stars, and allows firmer distance estimates to be derived. We study a direction close to the tangent (l~290{deg}) of the Carina arm, in an attempt to detect optical spiral tracers far beyond the Carina branch, where radio observations and model predictions appear to indicate the presence of an extension of the Perseus and Norma-Cygnus spiral arms in the fourth quadrant. Along this line of sight, we detect three distinct groups of young stars. Two of them, at distances of ~2.5 and ~6.0kpc, belong to the Carina spiral arm, which is traversed twice in this particular direction. Interestingly, the latter is detected for the first time. The third group, at a distance of ~12.7kpc, is probably related to the Perseus arm which lies beyond the Carina arm, and constitutes the first optical detection of this arm in the fourth Galactic quadrant. The position of this feature is consistent with both HI observations and model predictions. We also present evidence that this extremely distant group, formerly assumed to be a star cluster (Shorlin 1), is a diffuse, young population, typically found in spiral galaxies. In addition, our data-set does not support, as claimed in the literature, the possible presence of the Monoceros Ring in this direction. This study highlights how multicolor optical studies can be effective in probing the spiral structure of the outer Galactic disk. More fields need to be studied in this region of the Galaxy to constrain the spiral structure in the fourth Galactic quadrant more accurately, in particular, the shape and extent of the Perseus arm, and, possibly, to detect the even more distant Norma-Cygnus arm.
7175. UBV photometry of 163 stars around SU Cyg
ID:
ivo://CDS.VizieR/J/AJ/113/2104
Title:
UBV photometry of 163 stars around SU Cyg
Short Name:
J/AJ/113/2104
Date:
21 Oct 2021
Publisher:
CDS
Description:
Photoelectric, CCD, and photographic photometry is presented for a sample of 163 stars in the field of the short-period Cepheid SU Cyg for the purpose of searching for a putative cluster that might be associated with the Cepheid. Although the variable is situated in a clump of stars that has the appearance of a sparse cluster, the photometric evidence indicates that they are not a physical group. About two dozen B and A-type stars randomly distributed in the field lie at a common distance of 1086+/-60pc (V_0_-M_V_= 10.18+/-0.12 for R=2.94+/-0.38), but they are likely to represent at best a segment of the Vul OB4 association, which overlaps the region. SU Cyg is unlikely to be a member of that group. The close optical companion to SU Cyg, an A2 V star with a radial velocity (<VR>=-23.6+/-7.1km/s) close to the systemic velocity of the Cepheid, is a spectroscopic binary that might be physically related to the variable. Its primary importance is for helping to establish a space reddening of E_(B-V_)=0.15+/-0.01 for SU Cyg. Despite the lack of related cluster stars to SU Cyg, its two unresolved companions can be used to place restrictions on the likely luminosity of the Cepheid. The resulting value of <M_V_><=-3.02+/-0.23 relative to its companions agrees closely with a value of <MV>(PLC)=-3.03+/-0.07 obtained from the Cepheid PLC relation.
7176. UBV photometry of stars in Berkeley 55
ID:
ivo://CDS.VizieR/J/AJ/143/46
Title:
UBV photometry of stars in Berkeley 55
Short Name:
J/AJ/143/46
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present UBV photometry of the highly reddened and poorly studied open cluster Berkeley 55 (= C 2115+515), revealing an important population of B-type stars and several evolved stars of high luminosity. Intermediate-resolution far-red spectra of several candidate members confirm the presence of one F-type supergiant and six late supergiants or bright giants. The brightest blue stars are mid-B giants. Spectroscopic and photometric analyses indicate an age 50+/-10Myr. The cluster is located at a distance d~4kpc, consistent with other tracers of the Perseus Arm in this direction. Berkeley 55 is thus a moderately young open cluster with a sizable population of candidate red (super)giant members, which can provide valuable information about the evolution of intermediate-mass stars.
7177. UBV photometry of stars near galactic plane
ID:
ivo://CDS.VizieR/J/A+AS/93/553
Title:
UBV photometry of stars near galactic plane
Short Name:
J/A+AS/93/553
Date:
21 Oct 2021
Publisher:
CDS
Description:
(no description available)
7178. UBV Photometry of Stars with Accurate Positions
ID:
ivo://CDS.VizieR/II/182
Title:
UBV Photometry of Stars with Accurate Positions
Short Name:
II/182
Date:
21 Oct 2021
Publisher:
CDS
Description:
UBV photometry is presented for stars from AGK3R, NPZT, the Yale Bright Star Catalog (HR), and the FK5 faint extension. Stars with previously published UBV data were not selected. Observations were taken at the Kvistaberg Observatory and La Palma.
7179. UBV photometry of the 30 Dor region
ID:
ivo://CDS.VizieR/J/AJ/107/1054
Title:
UBV photometry of the 30 Dor region
Short Name:
J/AJ/107/1054
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report on Planetary Camera observations of the central region of 30 Doradus in the Large Magellanic Cloud. These images of 30 Doradus are the first "deep" HST exposures that have appropriate photometric calibration. The B band (F439W) image, which shows R136a at the center of the PC6 CCD chip, reveals over 200 stars within 3" of the center of R136a, and over 800 stars in a 35"x35" area. We used Malumuth et al.'s [The First Year of HST Observations, edited by A. L. Kinney and J. C. Blades (ST ScI, Baltimore) (1991)] PSF-fitting method to measure the magnitudes of all stars on the PC6 chip. These new B magnitudes, along with U and V magnitudes from archival PC images, yield a luminosity function, mass density profile, and initial mass function of the 30 Doradus ionizing cluster. The mass distribution is well fit by a King model with a core radius, Rc=0.96" (0.24pc), a tidal radius, Rt=110" (28pc), and a total mass, M=16800M_{sun}_. Both the luminosity function and initial mass function show evidence for mass segregation, in the sense that the central region has a higher fraction of massive stars than the outer regions. This is the first observational evidence for mass segregation in a very young cluster (age ~3 million years). The observations admit the hypothesis that the mass segregation occurred in the process of star formation and/or that the mass segregation is the result of dynamical evolution.
7180. UBV photometry of UV Cas
ID:
ivo://CDS.VizieR/J/PAZh/26/535
Title:
UBV photometry of UV Cas
Short Name:
J/PAZh/26/535
Date:
21 Oct 2021
Publisher:
CDS
Description:
UBV observations of UV Cas during 1996-1999 show mostly irregular light variations.