Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/J/A+A/242/401
- Title:
- Walraven photometry of WX Hyi
- Short Name:
- J/A+A/242/401
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The SU UMa-type dwarf nova WX Hyi was observed in the 5 passbands VBLUW (544, 430, 384, 362 and 324nm) during 15 nights on the 90cm telescope at ESO (La Silla), between July and November 1988, with an integration time of 16s.
- ID:
- ivo://CDS.VizieR/J/ApJ/697/1741
- Title:
- Warped disks of YSOs in Galactic center
- Short Name:
- J/ApJ/697/1741
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The central parsec around the supermassive black hole in the Galactic center (GC) hosts more than 100 young and massive stars. Outside the central cusp (R~1") the majority of these O and Wolf-Rayet (W-R) stars reside in a main clockwise system, plus a second, less prominent disk or streamer system at large angles with respect to the main system. Here we present the results from new observations of the GC with the AO-assisted near-infrared imager NACO and the integral field spectrograph SINFONI on the ESO/VLT. These include the detection of 27 new reliably measured W-R/O stars in the central 12" and improved measurements of 63 previously detected stars, with proper motion uncertainties reduced by a factor of 4 compared to our earlier work. Based on the sample of 90 well measured W-R/O stars, we develop a detailed statistical analysis of their orbital properties and orientations. We show that half of the W-R/O stars are compatible with being members of a clockwise rotating system.
- ID:
- ivo://CDS.VizieR/J/AJ/128/712
- Title:
- Washington Photometry in NGC 5128
- Short Name:
- J/AJ/128/712
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- To investigate the global properties of the globular cluster system (GCS) around NGC 5128, the central giant elliptical galaxy in the nearby Centaurus group, we have obtained deep CCD imaging for an area of almost 2{deg}^2^ centered on the galaxy. Our data, in the CMT_1_ Washington photometric system, reach an approximate limiting magnitude of T_1_~R~22 and contain magnitudes, colors, and coordinates for more than 100,000 objects. Of these, the vast majority (about 99%) are either foreground stars or faint background galaxies; the old-halo globular clusters make up the remaining tiny fraction of the sample. Our database, however, provides the material for understanding the large-scale features of the GCS, including its metallicity distribution (MDF), luminosity distribution, and spatial structure.
- ID:
- ivo://CDS.VizieR/J/AJ/128/723
- Title:
- Washington Photometry in NGC 5128. II
- Short Name:
- J/AJ/128/723
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Building on the CMT_1_ photometric database presented in Paper I (Cat. <J/AJ/128/712>), in this paper we derive the large-scale properties of the globular cluster system (GCS) in NGC 5128, the nearest giant elliptical and the dominant galaxy in the Centaurus group. Using the metallicity-sensitive C-T_1_ color index, we discuss the metallicity distribution function (MDF) for a subsample of 211 previously identified clusters, all on a homogeneous photometric system. We find the MDF to be strongly bimodal, with metallicity peaks at [Fe/H]=-1.55 and -0.55 and with nearly equal numbers of clusters in each of the metal-poor and metal-rich modes. Finally, we present a list of 327 new cluster candidates not identified in any previous surveys; most of these are in the less well studied bulge region of the galaxy and along the minor axis.
- ID:
- ivo://CDS.VizieR/J/AJ/136/2321
- Title:
- Washington photometry of Bootes I stars
- Short Name:
- J/AJ/136/2321
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present Washington CT_1_T_2_ photometry of a field central to the Bootes I dwarf spheroidal galaxy, which was discovered as a stellar overdensity in the Sloan Digital Sky Survey (DR5). We show that the Washington filters are much more effective than the Sloan filters in separating the metal-poor turn-off stars in the dwarf galaxy from the foreground stars. We detect 165 objects in the field, and statistically determine that just over 40% of the objects are nonmembers. Our statistical analysis mostly agrees with radial velocity measurements of the brighter stars. We find that there is a distinct main-sequence turn-off and subgiant branch, where there is some evidence of a spread in chemical abundance.
- ID:
- ivo://CDS.VizieR/J/A+A/572/A49
- Title:
- WASP-94AB photometry and radial velocities
- Short Name:
- J/A+A/572/A49
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report the discovery of two hot-Jupiter planets, one orbiting each star of a wide binary system. WASP-94A (2MASS 20550794-3408079) is an F8 type star hosting a transiting planet with a radius of 1.72+/-0.06R_Jup_, a mass of 0.445+/ 0.026M_Jup_ and an orbital period of 3.95 days. The Rossiter-McLaughlin effect is clearly detected and the measured projected spin-orbit angle indicates that the planet occupies a retrograde orbit. WASP-94B (2MASS 20550915-3408078) is an F9 stellar companion at an angular separation of 15" (projected separation 2700AU), hosting a gas giant of minimum mass 0.617+/-0.028M_Jup_ with a period of 2.008-days, detected by Doppler measurements. The orbital planes of the two planets are inclined relative to each other, indicating that at least one of them is inclined relative to the plane of the stellar binary. These hot Jupiters in a binary system bring new insights into the formation of close-in giant planets and the role of stellar multiplicity.
- ID:
- ivo://CDS.VizieR/J/A+A/549/A18
- Title:
- WASP-30 and J1219-39 light & velocity curves
- Short Name:
- J/A+A/549/A18
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This paper introduces a series of papers aiming to study the dozens of low mass eclipsing binaries (EBLM), with F, G, K primaries, that have been discovered in the course of the WASP survey. Our objects are mostly single-line binaries whose eclipses have been detected by WASP and were initially followed up as potential planetary transit candidates. These have bright primaries, which facilitates spectroscopic observations during transit and allows the study of the spin-orbit distribution of F, G, K+M eclipsing binaries through the Rossiter-McLaughlin effect.
- ID:
- ivo://CDS.VizieR/J/AcA/68/371
- Title:
- WASP and KELT planet transits
- Short Name:
- J/AcA/68/371
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Theoretical calculations and some indirect observations show that massive exoplanets on tight orbits must decay due to tidal dissipation within their host stars. This orbital evolution could be observationally accessible through precise transit timing over a course of decades. The rate of planetary in-spiraling may not only help us to understand some aspects of evolution of planetary systems, but also can be used as a probe of the stellar internal structure. In this paper we present results of transit timing campaigns organized for a carefully selected sample of the Northern hemisphere hot Jupiter-like planets which were found to be the best candidates for detecting planet-star tidal interactions. Among them, there is the WASP-12 system which is the best candidate for possessing an in-falling giant exoplanet. Our new observations support the scenario of orbital decay of WASP-12 b and allow us to refine its rate. The derived tidal quality parameter of the host star Q'*=(1.82+/-0.32)x10^5^ is in agreement with theoretical predictions for subgiant stars. For the remaining systems - HAT-P-23, KELT-1, KELT-16, WASP-33, and WASP-103 - our transit timing data reveal no deviations from the constant-period models, hence constraints on the individual rates of orbital decay were placed. The tidal quality parameters of host stars in at least four systems - HAT-P-23, KELT-1, WASP-33, and WASP-103 - were found to be greater than the value reported for WASP-12. This is in line with the finding that those hosts are main sequence stars, for which efficiency of tidal dissipation is predicted to be relatively weak.
- ID:
- ivo://CDS.VizieR/J/MNRAS/434/1300
- Title:
- WASP-15 and WASP-16 light curves
- Short Name:
- J/MNRAS/434/1300
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present new photometric observations of WASP-15 and WASP-16, two transiting extrasolar planetary systems with measured orbital obliquities but without photometric follow-up since their discovery papers. Our new data for WASP-15 comprise observations of one transit simultaneously in four optical passbands using GROND on the MPG/European Southern Observatory (ESO) 2.2m telescope, plus coverage of half a transit from DFOSC on the Danish 1.54m telescope, both at ESO La Silla. For WASP-16 we present observations of four complete transits, all from the Danish telescope. We use these new data to refine the measured physical properties and orbital ephemerides of the two systems. Whilst our results are close to the originally determined values for WASP-15, we find that the star and planet in the WASP-16 system are both larger and less massive than previously thought.
