- ID:
- ivo://CDS.VizieR/J/AJ/106/2429
- Title:
- Behlen Obs. variables stars survey
- Short Name:
- J/AJ/106/2429
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In a previous paper, photometry for the first ninety-three stars in a photometric survey of variable stars was discussed. Finding charts, accurate coordinates, and light curves for those stars are presented here. The reliability of the coordinates from the General Catalogue of Variable Stars is discussed. The magnitude scale of the present photometry is compared with that of the Hubble Space Telescope Guide Star Catalogue.
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- ID:
- ivo://CDS.VizieR/J/other/BOBeo/155.3
- Title:
- Belgrade meridian circle catalog
- Short Name:
- J/other/BOBeo/15
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The authors present an observational catalogue containing the positions of 351 stars situated in the vicinity of radio sources (RRS2, Tel'nyuk-Adamchuk & Kumkova, 1991, IAU Colloq. 127, 363) worked out by differential method in the FK5 system. The (O-C) corrections to the positions of 267 fundamental stars used in the determination of the instrument parameters are also presented. The star positions are derived from the observations with the Belgrade Large Meridian Circle during 1991-1993.
- ID:
- ivo://CDS.VizieR/J/ApJS/234/40
- Title:
- Be-like ions from BII to NeVII transition data
- Short Name:
- J/ApJS/234/40
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Large-scale self-consistent multiconfiguration Dirac-Hartree-Fock (MCDHF) and relativistic configuration interaction (RCI) calculations are reported for the n<=6 levels in Be-like ions from BII to NeVII. Effects from electron correlation are taken into account by means of large expansions in terms of a basis of configuration state functions, and a complete and accurate data set of excitation energies; lifetimes; wavelengths; electric dipole, magnetic dipole, electric quadrupole, and magnetic quadrupole line strengths; transition rates; and oscillator strengths for these levels is provided for each ion. Comparisons are made with available experimental and theoretical results. The uncertainty of excitation energies is assessed to be 0.01% on average, which makes it possible to find and rule out misidentifications and aid new line identifications involving high-lying levels in astrophysical spectra. The complete data set is also useful for modeling and diagnosing astrophysical plasmas.
- ID:
- ivo://CDS.VizieR/J/ApJS/79/77
- Title:
- Bell Lab. H I Survey - High Velocity Clouds
- Short Name:
- J/ApJS/79/77
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The sky north of declination -40 deg. was observed in the 21 cm line of atomic hydrogen with the FWHM = 2 deg. beam of the 20 foot horn reflector at AT&T Bell Laboratories, Crawford Hill. The survey covers a velocity range of 654 km/s centered on the Galactic standard of rest, with 5.3 km/s wide filters. This survey is distinguished by its sensitivity to low surface brightness features (antenna temperature about 50 mK) and relative freedom from sidelobe contamination. The high-velocity cloud list was extracted and catalogued automatically from the survey data.
- ID:
- ivo://CDS.VizieR/VIII/10
- Title:
- Bell Laboratories H I Profiles
- Short Name:
- VIII/10
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This survey consists of H I 21-cm spectra covering galactic latitudes |b|>10degrees, North of Declination -40deg, observed with the 20-foot horn reflector at AT&T Bell Laboratories, Crawford Hill. The instrument beam is 2{deg} (FWHM). The data consist of 124-channel profiles sorted in Galactic latitude and longitude; each channel has a width of 5.3km/s. The data were obtained by holding the telescope fixed and letting the sky drift through. Then the natural coordinate system for the data is in equatorial coordinates, so the data are not gridded in Galactic coordinates. Note that this catalog represents the Bell Laboratories H I Survey in a preliminary version; it is superseded by Catalog VIII/28.
- ID:
- ivo://CDS.VizieR/VIII/28
- Title:
- Bell Laboratories H I Survey
- Short Name:
- VIII/28
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The sky north of declination -40{deg} was observed in the 21cm line of atomic hydrogen with the FWHM=2{deg} beam of the 20 foot horn reflector at AT&T Bell Laboratories, Crawford Hill. The survey covers a velocity range of 654km/s centered on the Galactic standard of rest, with 5.3km/s wide filters. This survey is distinguished by its sensitivity to low surface brightness features (antenna temperature about 50mK) and relative freedom from sidelobe contamination. High-velocity clouds are extracted and catalogued automatically. The data are presented in declination zones in equatorial and polar coordinates, and as R.A. - velocity images.
- ID:
- ivo://CDS.VizieR/J/ApJ/767/64
- Title:
- Benchmark light curves for exoplanet eclipses
- Short Name:
- J/ApJ/767/64
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Ground-based observations of exoplanet eclipses provide important clues to the planets' atmospheric physics, yet systematics in light curve analyses are not fully understood. It is unknown if measurements suggesting near-infrared flux densities brighter than models predict are real, or artifacts of the analysis processes. We created a large suite of model light curves, using both synthetic and real noise, and tested the common process of light curve modeling and parameter optimization with a Markov Chain Monte Carlo algorithm. With synthetic white noise models, we find that input eclipse signals are generally recovered within 10% accuracy for eclipse depths greater than the noise amplitude, and to smaller depths for higher sampling rates and longer baselines. Red noise models see greater discrepancies between input and measured eclipse signals, often biased in one direction. Finally, we find that in real data, systematic biases result even with a complex model to account for trends, and significant false eclipse signals may appear in a non-Gaussian distribution. To quantify the bias and validate an eclipse measurement, we compare both the planet-hosting star and several of its neighbors to a separately chosen control sample of field stars. Re-examining the Rogers et al. (2009, J/ApJ/707/1707) Ks-band measurement of CoRoT-1b finds an eclipse 3190_-440_^+370^ppm deep centered at {phi}_me_=0.50418_-0.00203_^+0.00197^. Finally, we provide and recommend the use of selected data sets we generated as a benchmark test for eclipse modeling and analysis routines, and propose criteria to verify eclipse detections.
- ID:
- ivo://CDS.VizieR/J/MNRAS/437/1241
- Title:
- Be 81, NGC 1917 and NGC 2141 BVI photometry
- Short Name:
- J/MNRAS/437/1241
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In this paper we analyse the evolutionary status of three open clusters: NGC 1817, NGC 2141 and Berkeley 81. They are all of intermediate age, two are located in the Galactic anticentre direction while the third one is located in the Galactic Centre direction. All of them were observed with Large Binocular Camera at Large Binocular Telescope using the Bessel B, V and I filters. The cluster parameters have been obtained using the synthetic colour-magnitude diagram (CMD) method, i.e. the direct comparison of the observational CMDs with a library of synthetic CMDs generated with different evolutionary sets (Padova, FRANEC and FST). This analysis shows that NGC 1817 has subsolar metallicity, age between 0.8 and 1.2Gyr, reddening E(B-V) in the range 0.21 and 0.34 and distance modulus (m-M)_0_ of about 10.9; NGC 2141 is older, with age in the range 1.25 and 1.9Gyr, E(B-V) between 0.36 and 0.45, (m-M)_0_ between 11.95 and 12.21 and subsolar metallicity; Berkeley 81 has metallicity about solar, with age between 0.75 and 1.0Gyr, has reddening E(B-V)~0.90 and distance modulus (m-M)_0~12.4. Exploiting the large field of view of the instrument we derive the structure parameters for NGC 2141 and Berkeley 81 by fitting a King profile to the estimated density profile. Combining this information with the synthetic CMD technique we estimate a lower limit for the cluster total mass for these two systems.
- ID:
- ivo://CDS.VizieR/J/AJ/148/75
- Title:
- Bent-tailed radio galaxies Chandra Deep Field South
- Short Name:
- J/AJ/148/75
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Using the 1.4GHz Australia Telescope Large Area Survey, supplemented by the 1.4GHz Very Large Array images, we undertook a search for bent-tailed (BT) radio galaxies in the Chandra Deep Field South. Here we present a catalog of 56 detections, which include 45 BT sources, 4 diffuse low-surface-brightness objects (1 relic, 2 halos, and 1 unclassified object), and a further 7 complex, multi-component sources. We report BT sources with rest-frame powers in the range 10^22^<=P_1.4 GHz_<=10^26^W/Hz, with redshifts up to 2 and linear extents from tens of kiloparsecs up to about 1Mpc. This is the first systematic study of such sources down to such low powers and high redshifts and demonstrates the complementary nature of searches in deep, limited area surveys as compared to shallower, large surveys. Of the sources presented here, one is the most distant BT source yet detected at a redshift of 2.1688. Two of the sources are found to be associated with known clusters: a wide-angle tail source in A3141 and a putative radio relic which appears at the infall region between the galaxy group MZ 00108 and the galaxy cluster AMPCC 40. Further observations are required to confirm the relic detection, which, if successful, would demonstrate this to be the least powerful relic yet seen with P_1.4GHz_=9x10^22^W/Hz. Using these data, we predict future 1.4GHz all-sky surveys with a resolution of ~10 arcsec and a sensitivity of 10{mu}Jy will detect of the order of 560,000 extended low-surface-brightness radio sources of which 440,000 will have a BT morphology.
- ID:
- ivo://nasa.heasarc/saxao
- Title:
- BeppoSAX Approved Pointings
- Short Name:
- SAXAO
- Date:
- 14 Feb 2025
- Publisher:
- NASA/GSFC HEASARC
- Description:
- The SAXAO database contains the list of the all accepted AO1/AO2/AO3/A04/AO5 SAX CORE and GO program proposals, approved for the first year of operations. The database also includes targets scheduled for the Science Verification Phase (SVP) (from launch, 30 April 1996, till August 1996). The CORE program includes proposals led by Principal Investigator belonging to Italian or Dutch institutions, to the Space Science Department of ESA or to the Max Planck Institute for Extraterrestial Physics in Garching. Approximately 80 percent of the first year observing time is allocated to the CORE program. The remaining 20 percent of time for the first year operations is reserved for the GO program. For the AO2 60 percent is allocated to the CORE program and 40 percent to the GO. For the AO3 and AO4 50 percent is allocated to the CORE program and 50 percent to the GO. More information on the SAX mission is available at the following address <a href="http://www.asdc.asi.it">http://www.asdc.asi.it</a> and also <a href="https://heasarc.gsfc.nasa.gov/docs/sax/saxgof.html">https://heasarc.gsfc.nasa.gov/docs/sax/saxgof.html</a>. This is a service provided by NASA HEASARC .
