Search

Start Over Capability Type Simple Cone Search
1911. CaII triplet in Sextans dSph galaxy
ID:
ivo://CDS.VizieR/J/MNRAS/411/1013
Title:
CaII triplet in Sextans dSph galaxy
Short Name:
J/MNRAS/411/1013
Date:
21 Oct 2021
Publisher:
CDS
Description:
We use Very Large Telescope (VLT)/Fibre Large Array Multi Element Spectrograph (FLAMES) intermediate-resolution (R~6500) spectra of individual red giant branch stars in the near-infrared Ca ii triplet (CaT) region to investigate the wide-area metallicity properties and internal kinematics of the Sextans dwarf spheroidal galaxy (dSph). Our final sample consists of 174 probable members of Sextans with accurate line-of-sight velocities (+/-2km/s) and CaT [Fe/H] measurements (+/-0.2dex).
1912. CaII triplet of RGB from VLT/FLAMES obs.
ID:
ivo://CDS.VizieR/J/MNRAS/383/183
Title:
CaII triplet of RGB from VLT/FLAMES obs.
Short Name:
J/MNRAS/383/183
Date:
21 Oct 2021
Publisher:
CDS
Description:
We demonstrate that low-resolution CaII triplet (CaT) spectroscopic estimates of the overall metallicity ([Fe/H]) of individual red giant branch (RGB) stars in two nearby dwarf spheroidal galaxies (dSphs) agree to +/-0.1-0.2dex with detailed high-resolution spectroscopic determinations for the same stars over the range -2.5<[Fe/H]<-0.5. For this study, we used a sample of 129 stars observed in low- and high-resolution modes with VLT/FLAMES in the Sculptor and Fornax dSphs. We also present the data-reduction steps we used in our low-resolution analysis and show that the typical accuracy of our velocity and CaT [Fe/H] measurement is ~2km/s and 0.1dex, respectively. We conclude that CaT[Fe/H] relations calibrated on globular clusters can be applied with confidence to RGB stars in composite stellar populations over the range -2.5<[Fe/H]<-0.5.
1913. Ca4227 indices in early-type galaxies
ID:
ivo://CDS.VizieR/J/AJ/130/2666
Title:
Ca4227 indices in early-type galaxies
Short Name:
J/AJ/130/2666
Date:
21 Oct 2021
Publisher:
CDS
Description:
We have investigated the abundance of calcium in early-type galaxies by measuring the strength of the CaI {lambda}4227 absorption line in their integrated spectra. The database used is the large sample of early-type galaxy integrated spectra in Caldwell and coworkers (2003AJ....125.2891C). We have measured Ca abundances from the CaI {lambda}4227 feature both by using the Lick Ca4227 index and by defining a new index, Ca4227_r_, that avoids the CN4216 molecular band in the continuum on the blueward side of the line.
1914. CAIXA. II. AGNs from excess variance analysis
ID:
ivo://CDS.VizieR/J/A+A/542/A83
Title:
CAIXA. II. AGNs from excess variance analysis
Short Name:
J/A+A/542/A83
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report on the results of the first XMM-Newton systematic "excess variance" study of all the radio quiet, X-ray unobscured AGN. The entire sample consist of 161 sources observed by XMM-Newton for more than 10ks in pointed observations, which is the largest sample used so far to study AGN X-ray variability on time scales less than a day. Recently it has been suggested that the same engine might be at work in the core of every Black Hole (BH) accreting object. In this hypothesis, the same variability should be observed in all AGN, once rescaled by the MBH (MBH) and accretion rate (dm/dt). We systematically compute the excess variance for all AGN, on different time-scales (10, 20, 40 and 80ks) and in different energy bands (0.3-0.7, 0.7-2 and 2-10keV).
1915. Calan-ESO proper-motion catalog
ID:
ivo://CDS.VizieR/J/ApJS/133/119
Title:
Calan-ESO proper-motion catalog
Short Name:
J/ApJS/133/119
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Calan-ESO Proper-Motion Catalog (CE Catalog) contains 542 stars with proper motions >=0.2"/yr, identified in 14 ESO areas in the southern hemisphere. Proper motions were measured from red IIIa-F plates taken 6-16yr apart. Comparing the CE catalog with the Luyten and the Luyten half-second catalogs, we find that both suffer from incompleteness, which is particularly serious (<~40% complete) for m_R_>~13, where many of the astrophysically interesting object can be found. Proper motions, coordinates, estimated magnitudes, and finding charts for all objects in the catalog are provided
1916. Calan-Yale Deep Extragalactic Research Survey X-Ray Source Catalog
ID:
ivo://nasa.heasarc/cyder
Title:
Calan-Yale Deep Extragalactic Research Survey X-Ray Source Catalog
Short Name:
CYDER
Date:
21 Feb 2025
Publisher:
NASA/GSFC HEASARC
Description:
The main goal of the Calan-Yale Deep Extragalactic Research (CYDER) Survey X-ray survey is to study serendipitous X-ray sources detected by Chandra in an intermediate flux range (10&lt;sup&gt;-15&lt;/sup&gt; to 10&lt;sup&gt;-12&lt;/sup&gt; ergs/s) that comprises most of the X-ray background. A total of 267 X-ray sources spread over five archived fields were detected. The log N - log S distribution obtained for this sample is consistent with the results of other surveys. Deep V and I images were taken of these fields in order to calculate X-ray-to-optical flux ratios. Identifications and redshifts were obtained for 106 sources using optical spectroscopy from 8 m class telescopes to reach the optically faintest sources, to the same level as deeper X-ray fields like the Chandra Deep Fields, showing that the nature of sources detected depends mostly on the optical limit for spectroscopy. This table was created by the HEASARC in March 2007 based on the CDS table J/ApJ/621/104, file table4.dat. This is a service provided by NASA HEASARC .
1917. Calcium abundances in 17 globular clusters
ID:
ivo://CDS.VizieR/J/ApJ/712/L21
Title:
Calcium abundances in 17 globular clusters
Short Name:
J/ApJ/712/L21
Date:
21 Oct 2021
Publisher:
CDS
Description:
We use abundances of Ca, O, Na, and Al from high-resolution UVES spectra of 200 red giants in 17 globular clusters (GCs) to investigate the correlation found by Lee et al. (2009Icar..199..413C) between chemical enrichment from SNII and star-to-star variations in light elements in GC stars. We find that (1) the [Ca/H] variations between first and second generation stars are tiny in most GCs (~0.02-0.03dex, comparable with typical observational errors). In addition, (2) using a large sample of red giants in M4 (NGC 6121) with abundances from UVES spectra from Marino et al. (2008, Cat. J/A+A/490/625), we find that Ca and Fe abundances in the two populations of Na-poor and Na-rich stars are identical.
1918. Calcium triplet index in LMC stars
ID:
ivo://CDS.VizieR/J/AJ/135/836
Title:
Calcium triplet index in LMC stars
Short Name:
J/AJ/135/836
Date:
21 Oct 2021
Publisher:
CDS
Description:
Infrared CaII triplet (CaT) spectroscopy has been used to derive stellar metallicities for individual stars in four Large Magellanic Cloud fields situated at galactocentric distances of 3{deg}, 5{deg}, 6{deg}, and 8{deg} to the north of the bar. The combination of spectroscopy with deep CCD photometry has allowed us to break the RGB age-metallicity degeneracy and compute the ages for the objects observed spectroscopically. The obtained age-metallicity relationships (AMRs) for our four fields are statistically indistinguishable. We conclude that the lower mean metallicity in the outermost field is a consequence of it having a lower fraction of intermediate-age stars, which are more metal-rich than the older stars. The disk AMR is similar to that for clusters. However, the lack of objects with ages between 3 and 10Gyr is not observed in the field population. Finally, we used data from the literature to derive consistently the AMR of the bar. Simple chemical evolution models have been used to reproduce the observed AMRs with the purpose of investigating which mechanism has participated in the evolution of the disk and bar.
1919. Calculated chemical composition of galactic PN
ID:
ivo://CDS.VizieR/J/AZh/82/437
Title:
Calculated chemical composition of galactic PN
Short Name:
J/AZh/82/437
Date:
21 Oct 2021
Publisher:
CDS
Description:
The results of a study of the chemical compositions of Galactic planetary nebulae taking into account two types of inhomogeneity in the nebular gas density in their envelopes are reported. New analytical expressions for the ionization correction factors have been derived and are used to determine the chemical compositions of the nebular gas in Galactic planetary nebulae. The abundances of He, N, O, Ne, S, and Ar have been found for 193 objects. The Y-Z diagrams for various He abundances are analyzed for type II planetary nebulae separately and jointly with HII regions. The primordial helium abundance Yp and enrichment ratio dY/dZ are determined, and the resulting values are compared with the data of other authors. Radial abundance gradients in the Galactic disk are studied using type II planetary nebulae.
1920. Calern Observatory absolute declinations
ID:
ivo://CDS.VizieR/J/A+AS/137/269
Title:
Calern Observatory absolute declinations
Short Name:
J/A+AS/137/269
Date:
21 Oct 2021
Publisher:
CDS
Description:
A regular observational programme with a photoelectric astrolabe have been performed at ``Observatoire du Calern" (Observatoire de la Cote d'Azur, OCA, {phi}=+43{deg}44'55.011"; {lambda}=-0^h^27^m^42.44^s^, Calern, Caussols, France) for the last twenty years. It has been almost fully automatized between 1984 and 1987. Since 1988 the photoelectric astrolabe was used without any modification. In addition to determining the daily orientation of the local vertical, the yearly analysis of the residuals permits to derive corrections to the used star catalogue Vigouroux et al. (1992A&AS...96..477V). A global reduction method was applied for the ASPHO observations. The new form of the equations Martin & Leister (1997A&AS..126..169M) give us the possibility of using the entire set of the observing program using data taken at two zenith distances (30{deg} and 45{deg}). The program contains about 41648 stars' transits of 269 different stars taken at ``Observatoire du Calern" (OCA). The reduction was based on the HIPPARCOS system. We discuss the possibility of computing absolute declinations through stars belonging simultaneously to the 30{deg} and 45{deg} zenith distances programmes. The absolute declination corrections were determined for 185 stars with precision of 0.027" and the value of the determined equator correction is -0.018"+/-0.005". The instrumental effects were also determined. The mean epoch is 1995.29.

Limit your search

more »

more »

more »

more »

more »

more »