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21942. The PASTEL catalogue
- ID:
- ivo://CDS.VizieR/B/pastel
- Title:
- The PASTEL catalogue
- Short Name:
- B/pastel
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- PASTEL is a bibliographical catalogue compiling determinations of stellar atmospheric parameters. It provides (Teff, logg, [Fe/H]) determinations obtained from detailed analyses of high resolution, high signal to noise spectra, carried out with the help of model atmospheres. It also provides effective temperatures Teff from various methods. PASTEL is regularly updated. The catalogue supersedes the two previous versions of the [Fe/H] catalogue (Cayrel de Strobel et al., 1997 [Cat. III/200], 2001 [Cat. III/221]). PASTEL is regularly updated.
- ID:
- ivo://CDS.VizieR/J/ApJ/784/3
- Title:
- The PAWS catalogs of GMCs and islands in M51
- Short Name:
- J/ApJ/784/3
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Using data from the PdBI Arcsecond Whirlpool Survey (PAWS), we have generated the largest extragalactic giant molecular cloud (GMC) catalog to date, containing 1507 individual objects. GMCs in the inner M51 disk account for only 54% of the total ^12^CO(1-0) luminosity of the survey, but on average they exhibit physical properties similar to Galactic GMCs. We do not find a strong correlation between the GMC size and velocity dispersion, and a simple virial analysis suggests that ~30% of GMCs in M51 are unbound. We have analyzed the GMC properties within seven dynamically motivated galactic environments, finding that GMCs in the spiral arms and in the central region are brighter and have higher velocity dispersions than inter-arm clouds. Globally, the GMC mass distribution does not follow a simple power-law shape. Instead, we find that the shape of the mass distribution varies with galactic environment: the distribution is steeper in inter-arm region than in the spiral arms, and exhibits a sharp truncation at high masses for the nuclear bar region. We propose that the observed environmental variations in the GMC properties and mass distributions are a consequence of the combined action of large-scale dynamical processes and feedback from high-mass star formation. We describe some challenges of using existing GMC identification techniques for decomposing the ^12^CO(1-0) emission in molecule-rich environments, such as M51's inner disk.
- ID:
- ivo://CDS.VizieR/J/ApJ/896/77
- Title:
- The PHLEK survey: oxygen & helium abundances
- Short Name:
- J/ApJ/896/77
- Date:
- 11 Mar 2022
- Publisher:
- CDS
- Description:
- We present Keck NIRSPEC and Keck NIRES spectroscopy of sixteen metal-poor galaxies that have pre-existing optical observations. The near-infrared (NIR) spectroscopy specifically targets the HeI{lambda}10830{AA} emission line, due to its sensitivity to the physical conditions of the gas in HII regions. We use these NIR observations, combined with optical spectroscopy, to determine the helium abundance of sixteen galaxies across a metallicity range 12+log_10_(O/H)=7.13-8.00. This data set is combined with two other samples where metallicity and helium abundance measurements can be secured: star-forming galaxies selected from the Sloan Digital Sky Survey spectroscopic database, and existing low-metallicity systems in the literature. We calculate a linear fit to these measurements, accounting for intrinsic scatter, and report a new determination of the primordial helium number abundance, y_P_=0.0805_-0.0017_^+0.0017^, which corresponds to a primordial helium mass fraction Y_P_=0.2436_-0.0040_^+0.0039^. Using our determination of the primordial helium abundance in combination with the latest primordial deuterium measurement, (D/H)_P_x10^5^=2.527+/-0.030, we place a bound on the baryon density {Omega}_b_h^2^=0.0215_-0.0005_^+0.0005^ and the effective number of neutrino species N_eff_=2.85_-0.25_^+0.28^. These values are in 1.3{sigma} agreement with those deduced from the Planck satellite observations of the temperature fluctuations imprinted on the cosmic microwave background.
21945. The Phoenix Survey
- ID:
- ivo://CDS.VizieR/J/MNRAS/306/708
- Title:
- The Phoenix Survey
- Short Name:
- J/MNRAS/306/708
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Using a deep Australia Telescope Compact Array (ATCA) radio survey covering an area of ~3deg^2^ to a 4{sigma} sensitivity of >=100mmJy at 1.4GHz, we study the nature of faint radio galaxies. About 50 per cent of the detected radio sources are identified with an optical counterpart revealed by CCD photometry to m_R=22.5mag. Near-infrared (K-band) data are also available for a selected sample of the radio sources, while spectroscopic observations have been carried out for about 40 per cent of the optically identified sample. These provide redshifts and information on the stellar content. Emission-line ratios imply that most of the emission-line sources are star-forming galaxies, with a small contribution (~10 per cent) from Sy1/Sy2 type objects. We also find a significant number of absorption-line systems, likely to be ellipticals. These dominate at high flux densities (>1mJy) but are also found at sub-mJy levels. Using the Balmer decrement we find a visual extinction A_V_=1.0 for the star-forming faint radio sources. This moderate reddening is consistent with the V-R and R-K colours of the optically identified sources. For emission-line galaxies, there is a correlation between the radio power and the Halpha luminosity, in agreement with the result of Benn et al. (1993MNRAS.263....9B). This suggests that the radio emission of starburst radio galaxies is a good indicator of star formation activity.
- ID:
- ivo://CDS.VizieR/II/235
- Title:
- The Photometric Magnitude Difference Catalog
- Short Name:
- II/235
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The Photometric Magnitude Difference Catalog is a collection of all double star photometric data which does not contain astrometric information and is therefore inappropriate for the Washington Double Star Catalog. Magnitude difference information can be useful in estimating mass ratios, determining photocentric positions which are color dependent, or into investigations of variability in close binary systems. Due to uncertainties in bandpass characteristics or variability, no summary line is presented, rather a complete listing of all data.
- ID:
- ivo://CDS.VizieR/J/ApJ/622/1102
- Title:
- The planet-metallicity correlation.
- Short Name:
- J/ApJ/622/1102
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have recently carried out spectral synthesis modeling to determine T_eff_, log(g), vsin(i), and [Fe/H] for 1040 FGK-type stars on the Keck, Lick, and Anglo-Australian Telescope planet search programs. This is the first time that a single, uniform spectroscopic analysis has been made for every star on a large Doppler planet search survey. We identify a subset of 850 stars that have Doppler observations sufficient to detect uniformly all planets with radial velocity semiamplitudes K>30m/s and orbital periods shorter than 4yr.
21948. The Pleiades open cluster
- ID:
- ivo://edu.gavo.org/eurovo/aida_pleiades
- Title:
- The Pleiades open cluster
- Date:
- 02 Apr 2025 14:48:15
- Publisher:
- The GAVO DC team
- Description:
- Within this use case you recognize a physical association of stars close in space as opposed to a superpositon created by projection effects of stars very far one from the others. The key measure is distance derived from parallax. With the true members of the association (open cluster) you create a Herzsprung-Russell diagram as in the tutorial “the stars” (ivo://edu.gavo.org/eurovo/aida_stars). The Herzsprung-Russell diagram of stellar clusters is very important because of the low noise of few unrelated stars. If used in the classroom this advanced use case requires a reasonable understanding of histograms and bidimensional scatter diagrams. It is also rather long to perform from beginning to end.
- ID:
- ivo://CDS.VizieR/J/A+A/332/L53
- Title:
- The PL relation of galactic carbon LPVs
- Short Name:
- J/A+A/332/L53
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The estimated true parallaxes of 115 carbon LPVs and their unbiased y-values (see Sect. 4) for a study of the period-luminosity relation. The tables contains the entry in the cited Stephenson's catalogue (1989, Cat. <III/156>), the log of the period in days, the absolute magnitude in the K-band, the y-quantity as defined in Sect. 4, the difference between the estimated true parallax and the observed one, the estimated true parallax, the square root of the weight (times 100) of every used y-value for Sample 1 PL-relation (Sect. 4) and the classification into three samples (see Subsec. 3.1).
21950. The PMM USNO-A1.0 Catalogue
- ID:
- ivo://CDS.VizieR/I/243
- Title:
- The PMM USNO-A1.0 Catalogue
- Short Name:
- I/243
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- USNO-A1.0 is a catalog of 488,006,860 sources whose positions can be used for astrometric references. These sources were detected by the Precision Measuring Machine (PMM) built and operated by the U. S. Naval Observatory Flagstaff Station during the scanning and processing of the Palomar Observatory Sky Survey I (POSS-I) O and E plates, the UK Science Research Council SRC-J survey plates, and the European Southern Observatory ESO-R survey plates. The PMM detects and processes at and beyond the nominal limiting magnitude of these surveys, but the large number of spurious detections requires that a filter be used to eliminate as many as possible. USNO-A's sole inclusion requirement was that there be spatially coincident detections (within a 2 arcsecond radius aperture) on the blue and red survey plate. For field centers of -30 degrees and above, data come from POSS-I plates, while data from field centers of -35 and below come from SRC-J and ESO-R plates.
