Search

Start Over Capability Type Simple Cone Search
16931. Vilnius photometry of M29 (NGC6913)
ID:
ivo://CDS.VizieR/J/BaltA/22/181
Title:
Vilnius photometry of M29 (NGC6913)
Short Name:
J/BaltA/22/181
Date:
21 Oct 2021
Publisher:
CDS
Description:
Magnitudes and color indices in the Vilnius seven-color system were determined for 1752 stars down to V = 19.5 mag in the direction of the open cluster M29 (NGC 6913). The region is centered at RA=20:24, DEC=+38:30 (J2000) and covers an area of 1.5 sq. deg. The photometric data are used to classify about 70% of stars in spectral and luminosity classes and peculiarity types.
16932. Vilnius photometry of NGC 1647 area
ID:
ivo://CDS.VizieR/J/BaltA/14/179
Title:
Vilnius photometry of NGC 1647 area
Short Name:
J/BaltA/14/179
Date:
21 Oct 2021
Publisher:
CDS
Description:
The area of the open cluster NGC 1647 in Taurus is investigated by CCD photometry in the Vilnius seven-color system. Magnitudes and color indices are determined for 433 stars down to V=15.0mag in the 45arcmin diameter area. For 252 of them photometric spectral and luminosity classes, interstellar reddenings, extinctions and distances are obtained. According to the CDS WEBDA database, 89 of them have a high cluster membership probability. Their mean distance from the Sun is 555+/-74pc, excluding four stars which seem to be field stars. The main sequence starts at spectral class B7 V which corresponds to a cluster age of about 150 million years. Cluster members show a differential interstellar extinction ranging from 0.8 to 1.8mag. The mean extinction of the cluster stars is 1.12+/-0.25mag. Interstellar extinction in the area is dominated by the Taurus dark cloud complex at 160pc. Color excesses of individual stars correlate well with the 100um dust thermal emission intensity. The cluster shape is investigated by counting stars down to K=15.6mag and is found to be elongated in the direction roughly perpendicular to the Milky Way, with the flattening 0.4.
16933. Vilnius photometry of stars near NGP
ID:
ivo://CDS.VizieR/J/BaltA/8/443
Title:
Vilnius photometry of stars near NGP
Short Name:
J/BaltA/8/443
Date:
21 Oct 2021
Publisher:
CDS
Description:
Photoelectric seven-color photometry in the Vilnius medium-band system has been obtained for 374 stars in four MEGA proper-motion fields, KA 112, KA 113, KA 118 and KA 119, each of about 1.4 square degree size, near the North Galactic Pole. The catalog of observations is complete down to nearly V=13.0mag, except for the one field, KA 118, for which the completeness is achieved down to only V=12.5mag. For a description of the Vilnius photometric system, see e.g. <GCPD/21>
16934. Vilnius photometry of TGU H994
ID:
ivo://CDS.VizieR/J/BaltA/22/243
Title:
Vilnius photometry of TGU H994
Short Name:
J/BaltA/22/243
Date:
21 Oct 2021
Publisher:
CDS
Description:
The results of CCD photometry in the seven-color Vilnius system are given for 727 stars down to V~17 mag in a 1.5 square degree field in the region of dark cloud TGU H994 P1 (or LDN 1399, LDN 1400 and LDN 1402) in Camelopardalis. Using the intrinsic color indices and photometric reddening-free Q-parameters, two-dimensional spectral types for 73% of stars are determined.
16935. Vilnius photometry of TGU H994 P1
ID:
ivo://CDS.VizieR/J/A+A/585/A31
Title:
Vilnius photometry of TGU H994 P1
Short Name:
J/A+A/585/A31
Date:
21 Oct 2021
Publisher:
CDS
Description:
The results of CCD photometry in the seven-color Vilnius system are given for 855 stars down to V~20mag in three 12x12 arcmin areas of the dark cloud TGU H994P1. Observational data were obtained in 2014-2015 with the 1.8m VATT telescope of the Vatican Observatory on Mt Graham, Arizona. Two-dimensional classification in the MK system is given for about 65% of stars.
16936. Vilnius photometry on M92
ID:
ivo://CDS.VizieR/J/A+A/458/767
Title:
Vilnius photometry on M92
Short Name:
J/A+A/458/767
Date:
21 Oct 2021
Publisher:
CDS
Description:
CCD observations of the northern globular cluster M 92 were obtained in the PXYVS colors of the Vilnius photometric system. The results for 230 stars in an area centered on the cluster and for 178 stars in an area west of the cluster down to V=17.0mag are presented. After a brief outline of the data pathway from observations to reduction via IRAF and a discussion of the photometric errors, the [Fe/H] ratio of the globular cluster M 92 is determined by multicolor PXYVS Vilnius photometry.
16937. VI magnitudes of NGC 4535 stars
ID:
ivo://CDS.VizieR/J/A+A/618/A185
Title:
VI magnitudes of NGC 4535 stars
Short Name:
J/A+A/618/A185
Date:
21 Oct 2021
Publisher:
CDS
Description:
We analyzed the massive star population of the Virgo Cluster galaxy NGC 4535 using archival Hubble Space Telescope Wide Field Planetary Camera 2 images in filters F555W and F814W, equivalent to Johnson V and Kron-Cousins I. We performed high precision point spread function fitting photometry of 24353 sources including 3762 candidate blue supergiants, 841 candidate yellow supergiants and 370 candidate red supergiants. We estimated the ratio of blue to red supergiants as a decreasing function of galactocentric radius. Using Modules for Experiments in Stellar Astrophysics isochrones at solar metallicity, we defined the luminosity function and estimated the star formation history of the galaxy over the last 60Myrs. We conducted a variability search in the V and I filters using three variability indexes: the median absolute deviation, the interquartile range and the inverse von-Neumann ratio. This analysis yielded 120 new variable candidates with absolute magnitudes ranging from M_V_=-4 to -11mag. We used the MESA evolutionary tracks at solar metallicity, to classify the variables based on their absolute magnitude and their position on the color-magnitude diagram. Among the new candidate variable sources are eight candidate variable red supergiants, three candidate variable yellow supergiants and one candidate luminous blue variable, which we suggest for follow-up observations.
16938. VIMOS Public Extragalactic Survey (VIPERS) DR1
ID:
ivo://CDS.VizieR/J/A+A/562/A23
Title:
VIMOS Public Extragalactic Survey (VIPERS) DR1
Short Name:
J/A+A/562/A23
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the first Public Data Release (PDR-1) of the VIMOS Public Extragalactic Survey (VIPERS). It comprises 57204 spectroscopic measurements together with all additional information necessary for optimal scientific exploitation of the data, in particular the associated photometric measurements and quantification of the photometric and survey completeness. VIPERS is an ESO Large Programme designed to build a spectroscopic sample of =~100000 galaxies with i_AB_<22.5 and 0.5<z<1.2 with high sampling rate (=~45%). The survey spectroscopic targets are selected from the CFHTLS-Wide five-band catalogues in the W1 and W4 fields. The final survey will cover a total area of nearly 24 deg^2^, for a total comoving volume between z=0.5 and 1.2 of =~4x10^7^(Mpc/h)^3^ and a median galaxy redshift of z=~0.8. The release presented in this paper includes data from virtually the entire W4 field and nearly half of the W1 area, thus representing 64% of the final dataset. We provide a detailed description of sample selection, observations and data reduction procedures; we summarise the global properties of the spectroscopic catalogue and explain the associated data products and their use, and provide all the details for accessing the data through the survey database (http://vipers.inaf.it) where all information can be queried interactively.
16939. VIMOS Ultra Deep Survey (VUDS) DR1
ID:
ivo://CDS.VizieR/J/A+A/600/A110
Title:
VIMOS Ultra Deep Survey (VUDS) DR1
Short Name:
J/A+A/600/A110
Date:
21 Oct 2021
Publisher:
CDS
Description:
This paper describes the first data release (DR1) of the VIMOS Ultra Deep Survey (VUDS). The VUDS-DR1 is the release of all low-resolution spectroscopic data obtained in 276.9 arcmin^2^ of the CANDELS-COSMOS and CANDELS-ECDFS survey areas, including accurate spectroscopic redshifts z_spec_ and individual spectra obtained with VIMOS on the ESO-VLT. A total of 698 objects have a measured redshift, with 677 galaxies, two type-I AGN, and a small number of 19 contaminating stars. The targets of the spectroscopic survey are selected primarily on the basis of their photometric redshifts to ensure a broad population coverage. About 500 galaxies have z_spec_>2, 48of which have z_spec_>4; the highest reliable redshifts reach beyond z_spec_=6. This data set approximately doubles the number of galaxies with spectroscopic redshifts at z>3 in these fields. We discuss the general properties of the VUDS-DR1 sample in terms of the spectroscopic redshift distribution, the distribution of Lyman-{alpha} equivalent widths, and physical properties including stellar masses M* and star formation rates derived from spectral energy distribution fitting with the knowledge of z_spec_. We highlight the properties of the most massive star-forming galaxies, noting the wide range in spectral properties, with Lyman-{alpha} in emission or in absorption, and in imaging properties with compact, multi-component, or pair morphologies. We present the catalogue database and data products. All VUDS-DR1 data are publicly available and can be retrieved from a dedicated query-based database. Future VUDS data releases will follow this VUDS-DR1 to give access to the spectra and associated measurement of ~8000 objects in the full ~1 square degree of the VUDS survey.
16940. VIMOS VLT Deep Survey: faint type-1 AGN sample
ID:
ivo://CDS.VizieR/J/A+A/457/79
Title:
VIMOS VLT Deep Survey: faint type-1 AGN sample
Short Name:
J/A+A/457/79
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the type-1 active galactic nuclei (AGN) sample extracted from the VIMOS VLT Deep Survey's first observations of 21000 spectra in 1.75{deg}^2^. This sample, which is purely magnitude-limited and free of morphological or color-selection biases, contains 130 broad-line AGN (BLAGN) spectra with redshift up to 5. Our data are divided into a wide (I_AB_<=22.5) and a deep (I_AB_<=24) subsample containing 56 and 74 objects, respectively. Because of its depth and selection criteria, this sample is uniquely suited for studying the population of faint type-1 AGN. Our measured surface density (~472+/-48 BLAGN per square degree with I_AB_<=24) is significantly higher than that of any other optically selected sample of BLAGN with spectroscopic confirmation. By applying a morphological and color analysis to our AGN sample, we find that (1) ~23% of the AGN brighter than I_AB_=22.5 are classified as extended, and this percentage increases to ~42 for those with z<1.6; (2) a non-negligible fraction of our BLAGN are lying close to the color-space area occupied by stars in the u*-g' versus g'-r' color-color diagram. This leads us to the conclusion that the classical optical-ultraviolet preselection technique, if employed at such deep magnitudes (I_AB_=22.5) in conjuction with a preselection of point-like sources, can miss up to ~35% of the AGN population. Finally, we present a composite spectrum of our sample of objects. While the continuum shape is very similar to that of the SDSS composite at short wavelengths, it is much redder than that of the SDSS composite at {lambda}>=3000{AA}. We interpret this as due to significant contamination from emission of the host galaxies, as expected from the faint absolute magnitudes sampled by our survey.

Limit your search

more »

more »

more »

more »

more »

more »