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1851. BVRI photometry of Abell 2443
ID:
ivo://CDS.VizieR/J/AJ/122/38
Title:
BVRI photometry of Abell 2443
Short Name:
J/AJ/122/38
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present broadband photometry and provide a quantitative analysis of the structure of galaxies in the inner region of the Abell Cluster 2443 (z~0.1). The galaxy parameters have been derived by fitting a two-component model (Sersic r^1/n^ bulge and exponential disk) to a magnitude-limited sample. Using a new method of analysis that takes into account the effects of seeing on the structural parameters and considers ellipticity as an active parameter, we avoid systematic errors arising from assumptions of circular symmetry. Of the sample galaxies, 76% were classified with these models, while the rest were morphologically peculiar. For the spiral galaxies, the relation between n and B/D is consistent with the trend observed in nearby field galaxy samples. The Sersic index n (which can be considered as a concentration index) of the elliptical galaxies is correlated with the local surface density of the cluster. Monte Carlo simulations were used to check the reliability of the method and determine the magnitude selection criteria. Observations were obtained on 1998 August 19 at the 2.5 m Nordic Optical Telescope (NOT) at the Observatorio del Roque de los Muchachos on La Palma. The prime-focus CCD camera was used with pixel scale of 0.11"/pix, and the seeing ranged from FWHM 0.88" to 1".
1852. BVRI photometry of AGNs in clusters
ID:
ivo://CDS.VizieR/J/ApJ/664/761
Title:
BVRI photometry of AGNs in clusters
Short Name:
J/ApJ/664/761
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a study of the distribution of AGNs in clusters of galaxies with a uniformly selected, spectroscopically complete sample of 35 AGNs in eight clusters of galaxies at z=0.06-->0.31. We find that the 12 AGNs with LX>10^42^ergs/s in cluster members more luminous than a rest-frame M_R_<-20mag are more centrally concentrated than typical cluster galaxies of this luminosity, although these AGNs have comparable velocity and substructure distributions to other cluster members.
1853. BVRI photometry of candidate subdwarfs
ID:
ivo://CDS.VizieR/J/AJ/134/778
Title:
BVRI photometry of candidate subdwarfs
Short Name:
J/AJ/134/778
Date:
21 Oct 2021
Publisher:
CDS
Description:
Optical (BVRI) photometric measurements of a sample of 564 candidate cool subdwarfs in the nearby halo are presented. The stars generally span the color range 0.4<(B-V)<1.8; hence, the sample is composed of early F- through early M-type stars on the subdwarf sequence. The sample is selected from the revised NLTT catalog of Gould and Salim and Salim and Gould via a reduced proper motion diagram. The photometry is precise and accurate; in particular, for stars with 9<V<13.5 the photometry is accurate to 0.013, 0.015, 0.012, and 0.013mag in V, B-V, V-R, and V-I, respectively. For stars with 13.5<V<16 the photometry is accurate to 0.022, 0.018, 0.013, and 0.018mag in the same bands.
1854. BVRI photometry of Central Field of {omega} Cen
ID:
ivo://CDS.VizieR/J/A+AS/115/297
Title:
BVRI photometry of Central Field of {omega} Cen
Short Name:
J/A+AS/115/297
Date:
21 Oct 2021
Publisher:
CDS
Description:
This is a four colour photometric study of stars in the central part of the globular cluster {omega} Centauri. The observations were made at Siding Spring Observatory in April 1992 with the 1m ANU telesecope; a 1024x1024CCD has been used. The photometry was reduced to the BVRI system using standards by Landolt
1855. BVRI photometry of high-mass X-ray binaries
ID:
ivo://CDS.VizieR/J/A+A/574/A33
Title:
BVRI photometry of high-mass X-ray binaries
Short Name:
J/A+A/574/A33
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present photometric observations of the field around the optical counterparts of high-mass X-ray binaries. Our aim is to study the long-term photometric variability in correlation with their X-ray activity and derive a set of secondary standard stars that can be used for time series analysis. We find that the donors in Be/X-ray binaries exhibit larger amplitude changes in the magnitudes and colours than those hosting a supergiant companion. The amplitude of variability increases with wavelength in Be/X-ray binaries and remains fairly constant in supergiant systems. When time scales of years are considered, a good correlation between the X-ray and optical variability is observed. The X-rays cease when optical brightness decreases. These results reflect the fact that the circumstellar disk in Be/X-ray binaries is the main source of both optical and X-ray variability. We also derive the colour excess, E(B-V), selecting data at times when the contribution of the circumstellar disk was supposed to be at minimum, and we revisit the distance estimates.
1856. BVRI photometry of luminous stars in M31 and M33
ID:
ivo://CDS.VizieR/J/AJ/154/81
Title:
BVRI photometry of luminous stars in M31 and M33
Short Name:
J/AJ/154/81
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the first four years of BVRI photometry from an on-going survey to annually monitor the photometric behavior of evolved luminous stars in M31 and M33. Photometry was measured for 199 stars at multiple epochs, including 9 classic Luminous Blue Variables (LBVs), 22 LBV candidates, 10 post-RGB A/F type hypergiants, and 18 B[e] supergiants. At all epochs, the brightness is measured in the V-band and at least one other band to a precision of 0.04-0.10 mag down to a limiting magnitude of 19.0-19.5. Thirty three stars in our survey exhibit significant variability, including at least two classic LBVs caught in S Doradus-type outbursts. A hyperlinked version of the photometry catalog is at http://go.uis.edu/m31m33photcat
1857. BVRI photometry of NGC 2264
ID:
ivo://CDS.VizieR/J/A+A/345/521
Title:
BVRI photometry of NGC 2264
Short Name:
J/A+A/345/521
Date:
21 Oct 2021
Publisher:
CDS
Description:
The pre-main-sequence (PMS) population in the mass range between =~0.2 and =~3M_{sun}_ in southern part of the star-forming region NGC 2264 has been studied, determining both the Initial Mass Function in the region as well as the star-formation rates for different mass ranges. The sample is a composite one, derived through the union of samples obtained through different techniques and each suffering from different biases: previously known PMS stars in the region from the literature, photometrically-selected T Tauri candidates (from our own photometric data, discussed in detail in the present paper) and X-ray selected PMS candidates (discussed in detail in a companion paper) have been joined to form a sample which we show to be statistically complete (i.e. free from the biases which affect each of the parent samples) down to =~0.6M_{sun}_ (while being incomplete at lower masses). Individual masses and ages have been derived by placing the individual stars on evolutionary tracks, allowing us to derive both the IMF and the star formation rate. The Initial Mass Function thus derived for NGC 2264 shows evidence for a bimodal distribution of masses, with a break in the IMF at around 1M_{sun}_.
1858. BVRI photometry of Omega Cen
ID:
ivo://CDS.VizieR/J/PASP/106/828
Title:
BVRI photometry of Omega Cen
Short Name:
J/PASP/106/828
Date:
21 Oct 2021
Publisher:
CDS
Description:
BVRI photometry is given for stars in the omega Centauri (= NGC 5139 = C 1323-472) calibration field for the Wide Field/Planetary Camera of the Hubble Space Telescope.
1859. BVRI photometry of 4 open clusters
ID:
ivo://CDS.VizieR/J/AN/326/3
Title:
BVRI photometry of 4 open clusters
Short Name:
J/AN/326/3
Date:
21 Oct 2021
Publisher:
CDS
Description:
CCD photometry of the galactic open clusters NGC 2627, NGC 5617, Pismis 7, and Ruprecht 75 is presented. For the first cluster, BV data are given, for the others the data are BV(RI)_c. The star coordinates are relative to the corresponding cluster center. The observations were carried out from the Complejo Astronomico El Leoncito (Argentina), and from Las Campanas (Chile). Each cluster was observed on two different nights; when possible, measurements for a given star were averaged. NGC 2627 observations were carried out from CASLEO on the nights of 7-8 January 1997 and 23-24 April 2001, in the BV filters. NGC 5617 data in the BVRI filters were obtained at Las Campanas on the nights 10-11 and 11-12 April 1996, and at CASLEO on the 1-2 April 2001 night. Pismis 7 was observed from Campanas on the 13-14 and 15-16 April 1996 nights (BVRI). Ruprecht 75 data in the BVRI filters were obtained at Las Campanas on the 12-13 April 1996 night, and at CASLEO on the 20-21 April 2001 night.
1860. BVRI Photometry of 14 PMS stars
ID:
ivo://CDS.VizieR/J/other/BAJ/24.62
Title:
BVRI Photometry of 14 PMS stars
Short Name:
J/other/BAJ/24.6
Date:
21 Oct 2021
Publisher:
CDS
Description:
New photometric data from CCD multicolour BVRI observations of 14 pre-main sequence stars during the period from 2013 April to 2015 September are presented. The studied objects are located in the field of 'Gulf of Mexico' in the NGC 7000/IC 5070 star-forming complex. The stars from our study exhibit different types of photometric variability in all optical passbands. Using our long-term observations and data published by other authors, we tried to define the reasons for the observed brightness variations. On the basis of our new data previously unknown periodicity in the light curve of the star LkHa 189 (2.45-days) was registered.

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