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16951. VIPERS. Searching for cosmic voids
ID:
ivo://CDS.VizieR/J/A+A/570/A106
Title:
VIPERS. Searching for cosmic voids
Short Name:
J/A+A/570/A106
Date:
21 Oct 2021
Publisher:
CDS
Description:
Characterisation of cosmic voids gives unique information about the large-scale distribution of galaxies, their evolution, and the cosmological model. We identify and characterise cosmic voids in the VIMOS Public Extragalactic Redshift Survey (VIPERS) at redshift 0.55 <z< 0.9. A new void search method is developed based upon the identification of empty spheres that fit between galaxies. The method can be used to characterise the cosmic voids despite the presence of complex survey boundaries and internal gaps. We investigate the impact of systematic observational effects and validate the method against mock catalogues. We measure the void size distribution and the void-galaxy correlation function.
16952. VI photometry and spectroscopy in h+{chi} Per
ID:
ivo://CDS.VizieR/J/ApJS/186/191
Title:
VI photometry and spectroscopy in h+{chi} Per
Short Name:
J/ApJS/186/191
Date:
21 Oct 2021
Publisher:
CDS
Description:
From photometric observations of ~47000 stars and spectroscopy of ~11000 stars, we describe the first extensive study of the stellar population of the famous Double Cluster, h and {chi} Persei, down to subsolar masses. By analyzing optical spectra and optical/infrared photometry, we constrain the distance moduli (dM), reddening (E(B-V)), and ages for h Persei, {chi} Persei, and the low-density halo population surrounding both cluster cores. With the exception of mass and spatial distribution, the clusters are nearly identical in every measurable way. From these data, we establish the first spectroscopic and photometric membership lists of cluster stars down to early/mid M dwarfs. At minimum, there are ~5000 members within 10' of the cluster centers, while the entire h and {chi} Persei region has at least ~13000 and as many as 20000 members. The Double Cluster contains ~8400M_{sun}_ of stars within 10' of the cluster centers. We estimate a total mass of at least 20000M_{sun}_. We conclude our study by outlining outstanding questions regarding the past and present properties of h and {chi} Persei. From comparing recent work, we compile a list of intrinsic colors and derive a new effective temperature scale for O-M dwarfs, giants, and supergiants.
16953. VI Photometry and Variables in NGC 3201
ID:
ivo://CDS.VizieR/J/AJ/123/279
Title:
VI Photometry and Variables in NGC 3201
Short Name:
J/AJ/123/279
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Globular Cluster NGC 3201 was monitored for the existence of variable stars with 16.5<V<20 and 0.2days<period<5days. The files v*.dat contain time-series photometry data in V and I for the 14 variables detected in the field of NGC 3201. Only V6 (a blue straggler contact binary) is a member of the cluster. Due to its low-latitude position, interstellar extinction is present across the field of the cluster. The file phot.dat contains VI photometry data on the monitored stars. These data are NOT corrected for extinction. The variables V7, V8, and V9 were discovered during a follow-up observing run with a different telescope and therefore do not lie in the field covered by phot.dat. Variables V1-V9 are contact system eclipsing binaries, V10 is an RR Lyrae, V11 a semi-detached Algol type binary, V12 a detached binary system, and V13 and V14 are unclassified variable systems.
16954. VI photometry and velocity map of NGC 6388
ID:
ivo://CDS.VizieR/J/A+A/533/A36
Title:
VI photometry and velocity map of NGC 6388
Short Name:
J/A+A/533/A36
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present results from ground based VLT/FLAMES spectroscopy in combination with HST data for the globular cluster NGC 6388. The aim of this work is to probe whether this massive cluster hosts an intermediate-mass black hole at its center and to compare the results with the expected value predicted by the M-{sigma} scaling relation.
16955. VI photometry in 3 dwarf galaxies
ID:
ivo://CDS.VizieR/J/A+A/615/A96
Title:
VI photometry in 3 dwarf galaxies
Short Name:
J/A+A/615/A96
Date:
21 Oct 2021
Publisher:
CDS
Description:
The abundance and spatial distribution of dwarf galaxies are excellent empirical benchmarks against which to test models of structure formation on small scales. The nearby Centaurus group, with its two subgroups centered on Cen A and M 83, stands out as an important alternative to the Local Group for scrutinizing cosmological model predictions in a group of galaxies context. We have obtained deep optical images of three recently discovered M 83 satellite galaxy candidates with the FORS2 instrument mounted on the Very Large Telescope. We aim to confirm their group membership and study their stellar population. Deep V I-band photometry was used to resolve the brightest stars in our targets. Artificial star tests are performed to estimate the completeness and uncertainties of the photometry. The color-magnitude diagrams reveal the red giant branch (RGB) stars, allowing us to use the Sobel edge detection method to measure the magnitude of the RGB tip and thus derive distances and group membership for our targets. The mean metallicity of the dwarf galaxies were further determined by fitting BASTI model isochrones to the mean RGB locus.
16956. VI photometry in M33 outer regions
ID:
ivo://CDS.VizieR/J/AJ/128/224
Title:
VI photometry in M33 outer regions
Short Name:
J/AJ/128/224
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present deep CCD photometry in the VI passbands using the WIYN 3.5m telescope of a field located approximately 20 southeast of the center of M33; this field includes the region studied by Mould & Kristian in 1986ApJ...305..591M. The color-magnitude diagram (CMD) extends to I~25 and shows a prominent red giant branch (RGB), along with significant numbers of asymptotic giant branch and young main-sequence stars.
16957. VI photometry in Phoenix dwarf galaxy
ID:
ivo://CDS.VizieR/J/MNRAS/424/1113
Title:
VI photometry in Phoenix dwarf galaxy
Short Name:
J/MNRAS/424/1113
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present results from a wide-area photometric survey of the Phoenix dwarf galaxy, one of the rare dwarf irregular/dwarf spheroidal transition-type galaxies (dTs) of the Local Group (LG). These objects offer the opportunity to study the existence of possible evolutionary links between the late- and early-type LG dwarf galaxies, since the properties of dTs suggest that they may be dwarf irregulars in the process of transforming into dwarf spheroidals. Using FORS at the Very Large Telescope (VLT), we have acquired VI photometry of Phoenix. The data reach a signal-to-noise ratio (S/N)~10 just below the horizontal branch of the system and consist of a mosaic of images that covers an area of 26x26arcmin^2^ centred on the coordinates of the optical centre of the galaxy.
16958. VI photometry in South Galactic Pole
ID:
ivo://CDS.VizieR/J/AJ/112/772
Title:
VI photometry in South Galactic Pole
Short Name:
J/AJ/112/772
Date:
21 Oct 2021
Publisher:
CDS
Description:
Catalogs of V and I photometry for two 20 square degree regions near the South Galactic Pole, containing 30,000 and 19,000 stars, have been constructed using a CCD in time delay integration mode. Internal and external comparisons indicate a characteristic photometric accuracy ranging from 0.02mag at V~12 to 0.05 at V~18-18.5.
16959. VI photometry of 8 Cepheid candidates in M31
ID:
ivo://CDS.VizieR/J/AJ/149/66
Title:
VI photometry of 8 Cepheid candidates in M31
Short Name:
J/AJ/149/66
Date:
21 Oct 2021
Publisher:
CDS
Description:
The ultra-long-period Cepheids (ULPCs) are classical Cepheids with pulsation periods exceeding ~80days. The intrinsic brightness of ULPCs are ~1 to ~3mag brighter than their shorter period counterparts. This makes them attractive in future distance scale work to derive distances beyond the limit set by the shorter period Cepheids. We have initiated a program to search for ULPCs in M31, using the single-band data taken from the Palomar Transient Factory, and identified eight possible candidates. In this work, we presented the VI-band follow-up observations of these eight candidates. Based on our VI-band light curves of these candidates and their locations in the color-magnitude diagram and the Period-Wesenheit diagram, we verify two candidates as being truly ULPCs. The six other candidates are most likely other kinds of long-period variables. With the two confirmed M31 ULPCs, we tested the applicability of ULPCs in distance scale work by deriving the distance modulus of M31. It was found to be {mu}_M31,ULPC_=24.30+/-0.76mag. The large error in the derived distance modulus, together with the large intrinsic dispersion of the Period-Wesenheit (PW) relation and the small number of ULPCs in a given host galaxy, means that the question of the suitability of ULPCs as standard candles is still open. Further work is needed to enlarge the sample of calibrating ULPCs and reduce the intrinsic dispersion of the PW relation before re-considering ULPCs as suitable distance indicators.
16960. VI photometry of Cepheids in NGC 5128
ID:
ivo://CDS.VizieR/J/ApJ/654/186
Title:
VI photometry of Cepheids in NGC 5128
Short Name:
J/ApJ/654/186
Date:
21 Oct 2021
Publisher:
CDS
Description:
We discuss a new distance to NGC 5128 (Centaurus A) based on Cepheid variables observed with the Hubble Space Telescope. Twelve F555W (V) and six F814W (I) epochs of cosmic-ray-split WFPC2 observations were obtained. A total of 56 bona fide Cepheids were discovered, with periods ranging from 5 to ~50 days; five of these are likely Population II Cepheids of the W Virginis class, associated with the bulge or halo of NGC 5128.

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