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1841. BVR imaging survey of nine early-type galaxies
ID:
ivo://CDS.VizieR/J/AJ/127/3213
Title:
BVR imaging survey of nine early-type galaxies
Short Name:
J/AJ/127/3213
Date:
21 Oct 2021
Publisher:
CDS
Description:
We have conducted a BVR imaging survey of nine early-type galaxies previously verified to exist in extremely isolated environments. Our goals are to establish a baseline of morphological and photometric properties for spheroidal systems evolving in extremely low-density environments and to compare these properties with signatures predicted for merged galaxy groups.
1842. BVRI observations of 235 bright quasars
ID:
ivo://CDS.VizieR/J/AJ/138/845
Title:
BVRI observations of 235 bright quasars
Short Name:
J/AJ/138/845
Date:
21 Oct 2021
Publisher:
CDS
Description:
Photometric observations of 235 extragalactic objects that are potential targets for the Space Interferometry Mission (SIM) are presented. Mean B, V, R, I magnitudes at the 5% level are obtained at 1-4 epochs between 2005 and 2007 using the 1m telescopes at Cerro Tololo Inter-American Observatory and the Naval Observatory Flagstaff Station. Of the 134 sources that have V magnitudes in the Veron & Veron-Cetty catalog (Cat. VII/248), a difference of over 1.0mag is found for the observed-catalog magnitudes for about 36% of the common sources, and 10 sources show over 3mag difference. Our first set of observations presented here form the basis of a long-term photometric variability study of the selected reference frame sources to assist in mission target selection and to support QSO multicolor photometric variability studies in general.
1843. BVRI observations of LMC Cepheids
ID:
ivo://CDS.VizieR/J/ApJS/142/71
Title:
BVRI observations of LMC Cepheids
Short Name:
J/ApJS/142/71
Date:
21 Oct 2021
Publisher:
CDS
Description:
A homogeneous set of ground-based BVRI observations of ~600 Cepheids is presented to check the Cepheid period-luminosity (PL) zero point for the Large Magellanic Cloud (LMC). The sample of Cepheids is completely self-contained and has been reduced consistently to eliminate photometric differences caused by combining multiple sources of photometry. The Cepheid distances to nearby galaxies obtained by the Hubble Space Telescope (HST) Key Project on the Extragalactic Distance Scale were computed assuming a "standard" PL relation based on a compilation of photoelectric observations of 34 Cepheids and a standard distance modulus to the LMC of 18.50. The final Key Project results substituted a statistically stronger PL relation obtained by the OGLE collaboration. In this paper we compare our data with the OGLE PL relation; the subsample of LMC Cepheids with similar periods to those discovered in the nearby galaxies is fainter at the relevant periods by 0.04+/-0.02mag than the OGLE sample. Substituting in turn this PL relation for that of the OGLE collaboration would raise the Hubble constant by 2%+/-1%, a correction which is not significant. The multicolor data set will also be useful in considering the effects of reddening and chemical composition and deriving an improved Cepheid period-luminosity relation for the LMC.
1844. BVRI of comparison stars in AGN fields
ID:
ivo://CDS.VizieR/J/other/Ap/48.304
Title:
BVRI of comparison stars in AGN fields
Short Name:
J/other/Ap/48.30
Date:
21 Oct 2021
Publisher:
CDS
Description:
Results are presented from CCD BVRI-observations of 145 comparison stars in the neighborhoods of 14 Seyfert galaxies, 3 quasars, and 5 BL Lac objects with right ascensions of 12 to 24 hours. The magnitudes of the observed stars ranged from V=11 to V=17. The typical photometric error for stars brighter V=14 is 0.01m. The B, V, Rc, and Ic magnitudes of most of these stars were not known previously. 14'x14' finding charts are provided. These results can be used for differential photometry of the nuclei of active galaxies in the B, V, Rc, and Ic bands.
1845. BVRI photometry in dark globules
ID:
ivo://CDS.VizieR/J/A+AS/126/73
Title:
BVRI photometry in dark globules
Short Name:
J/A+AS/126/73
Date:
21 Oct 2021
Publisher:
CDS
Description:
Using a CCD detector, BVRI photometry has been carried out in the vicinity of nine Lynds dark nebulae. In conjunction with spectroscopic data which could be obtained at a later stage, the data listed herein could be used for possible distance determinations of the nine nebulae.
1846. BVRI photometry in 3 high-z clusters
ID:
ivo://CDS.VizieR/J/AJ/122/1125
Title:
BVRI photometry in 3 high-z clusters
Short Name:
J/AJ/122/1125
Date:
21 Oct 2021
Publisher:
CDS
Description:
New photometric and spectroscopic observations of galaxies in the directions of three distant clusters are presented as part of our ongoing high-redshift cluster survey. The clusters are Cl 1324+3011 at z=0.76, Cl 1604+4304 at z=0.90, and Cl 1604+4321 at z=0.92. We have spectroscopically confirmed cluster membership for 2040 galaxies in each system and have also obtained spectra for over 280 field galaxies spanning the range 0<z<2.5.
1847. BVRI photometry in metal-poor binaries
ID:
ivo://CDS.VizieR/J/A+A/419/167
Title:
BVRI photometry in metal-poor binaries
Short Name:
J/A+A/419/167
Date:
21 Oct 2021
Publisher:
CDS
Description:
We explored the regions within a radius of 25 arcsec around 473 nearby, low-metallicity G- to M-type stars using (VR)I optical filters and small-aperture telescopes. About 10% of the sample was searched up to angular separations of 90 arcsec. We applied photometric and astrometric techniques to detect true physical companions to the targets. The great majority of the sample stars was drawn from the Carney-Latham surveys; their metallicities range from roughly solar to [Fe/H]=-3.5dex. Our I-band photometric survey detected objects that are between 0 and 5mag fainter (completeness) than the target stars; the maximum dynamical range of our exploration is 9mag.
1848. BVRI photometry in NGC 6496
ID:
ivo://CDS.VizieR/J/AJ/145/165
Title:
BVRI photometry in NGC 6496
Short Name:
J/AJ/145/165
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present high-quality BVRI photometric data in the field of globular cluster NGC6496 obtained with the SOAR Telescope Adaptive Module (SAM). Our observations were collected as part of the ongoing SAM commissioning. The distance modulus and cluster color excess as found from the red clump are (m-M)_V_=15.71+/-0.02mag and E(V-I)=0.28+/-0.02mag. An age of 10.5+/-0.5Gyr is determined from the difference in magnitude between the red clump and the subgiant branch. These parameters are in excellent agreement with the values derived from isochrone fitting. From the color-magnitude diagram we find a metallicity of [Fe/H]=-0.65dex and hence support a disk classification for NGC 6496. The complete BVRI data set for NGC6469 is made available in the electronic edition of the Journal.
1849. BVRI photometry in NGC4147
ID:
ivo://CDS.VizieR/J/PASP/117/1325
Title:
BVRI photometry in NGC4147
Short Name:
J/PASP/117/1325
Date:
21 Oct 2021
Publisher:
CDS
Description:
New BVRI broadband photometry and astrometry are presented for the globular cluster NGC 4147, based upon measurements derived from 524 ground-based CCD images mostly either donated by colleagues or retrieved from public archives. We have also reanalyzed five exposures of the cluster obtained with WFPC2 on the Hubble Space Telescope in the F439W and F555W (B and V) filters.
1850. BVRI photometry in NGC 2419, Pal 4, and Pal 14
ID:
ivo://CDS.VizieR/J/PASP/117/37
Title:
BVRI photometry in NGC 2419, Pal 4, and Pal 14
Short Name:
J/PASP/117/37
Date:
21 Oct 2021
Publisher:
CDS
Description:
The results from work done to extend the Johnson-Cousins BVRI photometric standard sequence to faint levels of V~21mag in compact fields is presented. Such calibration and extension of sequences is necessary to fill a calibration gap if reliable photometry from modest aperture telescopes in space (e.g., the Hubble Space Telescope) or terrestrial telescopes with apertures exceeding 4m is to be done. Sequences like the ones presented here, which cover a large range in brightness as well as color, will allow photometric calibration to be done efficiently and will also make such work less prone to systematic sources of error. Photometry of stars in approximately 10'x10' fields around three globular clusters (NGC 2419, Pal 4, and Pal 14) are presented from data acquired over several photometric nights. In each field, several stars are measured in B, V, R, and I passbands, with standard errors in the mean less than 0.015mag from random errors, to levels fainter than V=21mag.

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