Search

Start Over Capability Type Simple Cone Search
1131. A supergiants UV and visible spectra
ID:
ivo://CDS.VizieR/J/A+AS/137/351
Title:
A supergiants UV and visible spectra
Short Name:
J/A+AS/137/351
Date:
21 Oct 2021
Publisher:
CDS
Description:
This paper is the first of a series whose aim is to perform a systematic study of A-type supergiant atmospheres and winds. Here we present a spectral atlas of 41 A-supergiants observed by us in high and medium resolution in the visible and ultraviolet. The atlas consists of profiles of the H{alpha}, H{beta}, H{gamma}, H{delta}, H{epsilon}, Ca II (H and K), Na I (D1 and D2), Mg II_4481_, Mg II [uv1] and Fe II [uv1, uv2, uv3, uv62, uv63, uv161] lines for 41 stars with spectral types ranging from B9 to A9 and luminosity classes Ia, Iab and Ib, and provides the basic data for a thoughtful study of these stars. The overall characteristics of the sample as well as the data reduction procedures are described. We also present some examples of spectral variability.
1132. A survey for quasars near quasars - QNQ
ID:
ivo://CDS.VizieR/J/A+A/487/539
Title:
A survey for quasars near quasars - QNQ
Short Name:
J/A+A/487/539
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the results of our slitless spectroscopic survey for quasars near 18 known high-redshift quasars (QNQ). The three tables list the survey fields (26.2'x33.5'), the newly confirmed quasars and the remaining unconfirmed quasar candidates, respectively. For each confirmed quasar we give the equatorial coordinates, the redshift measured from the follow-up slit spectra, the redshift uncertainty and the Johnson B magnitude with uncertainty. The redshift uncertainty has been determined from the redshift dispersions of several emission lines. For the remaining candidates we list the equatorial coordinates, the approximate V magnitude, the redshift based on the slitless spectrum and our assessment of the redshift confidence.
1133. A survey of carbon stars in the SMC
ID:
ivo://CDS.VizieR/J/A+AS/113/539
Title:
A survey of carbon stars in the SMC
Short Name:
J/A+AS/113/539
Date:
21 Oct 2021
Publisher:
CDS
Description:
A survey of carbon stars in the outer parts of the Small Magellanic Cloud has been completed; the candidate objects were identified by inspecting UK Schmidt Telescope objective-prism plates which cover a total area of ~220 sq deg on the sky, including the inter-Cloud region. Co-ordinates are given for 1185 newly identified carbon stars.
1134. A Survey of HII Regions in M31
ID:
ivo://CDS.VizieR/J/A+AS/31/439
Title:
A Survey of HII Regions in M31
Short Name:
J/A+AS/31/439
Date:
21 Oct 2021
Publisher:
CDS
Description:
An H-alpha survey, using a focal reducer and narrow-band interference filters, has resulted in the detection of nearly a thousand HII regions in M31. The catalog gives their positions, dimensions, and surface brightnesses. The surface brightnesses are on an absolute scale; the photographic measures were calibrated by using photoelectric measures from two different sources. The detection limit reached corresponds to an emission measure of 40cm^-6^pc at a temperature of 10000K.
1135. A Survey of Radio H II Regions in the Northern Sky
ID:
ivo://CDS.VizieR/VIII/58
Title:
A Survey of Radio H II Regions in the Northern Sky
Short Name:
VIII/58
Date:
21 Oct 2021
Publisher:
CDS
Description:
Nearly 500 radio continuum sources near the Galactic plane at declinations greater than -37 degrees were examined for radio recombination line emission to see if they might be HII regions. A total of 462 were detected, about half of these for the first time. The data are presented in an extensive table. Among the newly discovered nebulae are several with recombinations lines so narrow that their electron temperature must be less than 4600 K. In one case the line width (in several transitions) is only 11.6 km/s, requiring electron temperatures less than about 2900 K.
1136. A survey of stellar families
ID:
ivo://CDS.VizieR/J/ApJS/190/1
Title:
A survey of stellar families
Short Name:
J/ApJS/190/1
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the results of a comprehensive assessment of companions to solar-type stars. A sample of 454 stars, including the Sun, was selected from the Hipparcos catalog with {pi}>40mas, {sigma}{pi}/{pi}<0.05, 0.5<=B-V<=1.0 (~F6-K3), and constrained by absolute magnitude and color to exclude evolved stars. These criteria are equivalent to selecting all dwarf and subdwarf stars within 25pc with V-band flux between 0.1 and 10 times that of the Sun, giving us a physical basis for the term "solar-type". New observational aspects of this work include surveys for (1) very close companions with long-baseline interferometry at the Center for High Angular Resolution Astronomy Array, (2) close companions with speckle interferometry, and (3) wide proper-motion companions identified by blinking multi-epoch archival images. In addition, we include the results from extensive radial-velocity monitoring programs and evaluate companion information from various catalogs covering many different techniques. The results presented here include four new common proper-motion companions discovered by blinking archival images. Additionally, the spectroscopic data searched reveal five new stellar companions. Our synthesis of results from many methods and sources results in a thorough evaluation of stellar and brown dwarf companions to nearby Sun-like stars. The overall observed fractions of single, double, triple, and higher-order systems are 56%+/-2%, 33%+/-2%, 8%+/-1%, and 3%+/-1%, respectively, counting all confirmed stellar and brown dwarf companions.
1137. Asymmetric thick disk. II. Kinematics
ID:
ivo://CDS.VizieR/J/AJ/127/1567
Title:
Asymmetric thick disk. II. Kinematics
Short Name:
J/AJ/127/1567
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report a kinematic signature associated with the observed asymmetry in the distribution of thick-disk/inner halo stars interior to the solar circle described in Paper I (Parker et al., 2003AJ....126.1346P). In that paper, we found a statistically significant excess (20%-25%) of stars in quadrant I (l~20{deg}-55{deg}) both above and below the plane (b~+/-25{deg} to b~+/-45{deg}) compared with the complementary region in quadrant IV. We have measured Doppler velocities for 741 stars, selected according to the same magnitude and color criteria, in the direction of the asymmetry and in the corresponding fields in quadrant IV. We have also determined spectral types and metallicities measured from the same spectra.
1138. Asymmetry of oscillations in 43 Kepler stars
ID:
ivo://CDS.VizieR/J/ApJ/857/119
Title:
Asymmetry of oscillations in 43 Kepler stars
Short Name:
J/ApJ/857/119
Date:
21 Oct 2021
Publisher:
CDS
Description:
Oscillation properties are usually measured by fitting symmetric Lorentzian profiles to the power spectra of Sun-like stars. However, the line profiles of solar oscillations have been observed to be asymmetrical for the Sun. The physical origin of this line asymmetry is not fully understood; though, it should depend on the depth dependence of the source of wave excitation (convective turbulence) and details of the observable (velocity or intensity). For oscillations of the Sun, it has been shown that neglecting the asymmetry leads to systematic errors in the frequency determination. This could subsequently affect the results of seismic inferences of the solar internal structure. Using light curves from the Kepler spacecraft, we have measured mode asymmetries in 43 stars. We confirm that neglecting the asymmetry leads to systematic errors that can exceed the 1{sigma} confidence intervals for seismic observations longer than one year. Therefore, the application of an asymmetric Lorentzian profile should be favored to improve the accuracy of the internal stellar structure and stellar fundamental parameters. We also show that the asymmetry changes sign between cool Sun-like stars and hotter stars. This provides the best constraints to date on the location of the excitation sources across the Hertzsprung-Russel diagram.
1139. Atacama Cosmology Telescope (ACT) Extragalactic Southern Sources Catalog
ID:
ivo://nasa.heasarc/actsouth
Title:
Atacama Cosmology Telescope (ACT) Extragalactic Southern Sources Catalog
Short Name:
ACTSOUTH
Date:
21 Feb 2025
Publisher:
NASA/GSFC HEASARC
Description:
The ACTSOUTH catalog is a multi-frequency, multi-epoch catalog of extragalactic sources, based on 150, 220 and 280 GHz observations carried out in 2008, 2009 and 2010 using the Millimeter Bolometric Array Camera on the Atacama Cosmology Telescope. The catalog contains 695 sources, found in a sky area of ~600 square degrees. It is obtained by cross-matching sources found in 11 sub-catalogs, one for each season and frequency band. Also include are co-added data from ~150 and ~160 square degrees using 2 and 3 years of overlapping observations. The authors divide the sources into two populations, synchrotron and dusty emitters, based on their spectral behavior in the 150 - 220 GHz frequency range. They find 374 synchrotron sources and 321 dusty source candidates. Cross-matching with catalogs from radio to X-ray results in 264 synchrotron sources (71%) and 89 dusty sources (28%) with counterparts, suggesting that 232 dusty candidates are not in existing catalogs. This table was ingested by the HEASARC in November 2023 based upon the files downloaded from the LAMBDA archive at &lt;a href="https://lambda.gsfc.nasa.gov/product/act/act_south_cat_get.html"&gt;https://lambda.gsfc.nasa.gov/product/act/act_south_cat_get.html&lt;/a&gt;. This is a service provided by NASA HEASARC .
1140. Atacama Cosmology Telescope DR5 Sunyaev-Zeldovich Cluster Catalog
ID:
ivo://nasa.heasarc/actszclust
Title:
Atacama Cosmology Telescope DR5 Sunyaev-Zeldovich Cluster Catalog
Short Name:
ACTSZCLUST
Date:
21 Feb 2025
Publisher:
NASA/GSFC HEASARC
Description:
The catalog of 4195 optically confirmed Sunyaev-Zel&#39;dovich (SZ) selected galaxy clusters were detected with signal-to-noise &gt; 4 in 13,211 deg&lt;sup&gt;2&lt;/sup&gt; of sky surveyed by the Atacama Cosmology Telescope (ACT). Cluster candidates were selected by applying a multi-frequency matched filter to 98- and 150-GHz maps constructed from ACT observations obtained from 2008-2018 and confirmed using deep, wide-area optical surveys. The clusters span the redshift range 0.04 &lt; z &lt; 1.91 (median z = 0.52). The catalog contains 222 z &gt; 1 clusters, and a total of 868 systems are new discoveries. Assuming an SZ-signal vs. mass scaling relation calibrated from X-ray observations, the sample has a 90% completeness mass limit of M&lt;sub&gt;500c&lt;/sub&gt; &gt; 3.8 x 10&lt;sup&gt;14&lt;/sup&gt;M&lt;sub&gt;sol&lt;/sub&gt;, evaluated at z=0.5, for clusters detected at signal-to-noise ratio &gt; 5 in maps filtered at an angular scale of 2.40. The survey has a large overlap with deep optical weak-lensing surveys that are being used to calibrate the SZ-signal mass-scaling relation, such as the Dark Energy Survey (4566 deg&lt;sup&gt;2&lt;/sup&gt;), the Hyper Suprime-Cam Subaru Strategic Program (469 deg&lt;sup&gt;2&lt;/sup&gt;), and the Kilo Degree Survey (825 deg&lt;sup&gt;2&lt;/sup&gt;). This HEASARC database table was ingested in February 2021. It contains the ACT DR5 SZ cluster catalog obtained from the LAMDBA website (&lt;a href="https://lambda.gsfc.nasa.gov/product/act/actpol_dr5_szcluster_catalog_info.cfm#catalog"&gt;https://lambda.gsfc.nasa.gov/product/act/actpol_dr5_szcluster_catalog_info.cfm#catalog&lt;/a&gt;). This is a service provided by NASA HEASARC .

Limit your search

more »

more »

more »

more »

more »

more »