- ID:
- ivo://CDS.VizieR/J/A+A/598/A85
- Title:
- Disentangled spectra of R145
- Short Name:
- J/A+A/598/A85
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the first SB2 orbital solution and disentanglement of the massive Wolf-Rayet binary R145 (P=159d) located in the Large Magellanic Cloud. The primary was claimed to have a stellar mass greater than 300M_{sun}_, making it a candidate for the most massive star known. While the primary is a known late type, H-rich Wolf-Rayet star (WN6h), the secondary could not be so far unambiguously detected. Using moderate resolution spectra, we are able to derive accurate radial velocities for both components. By performing simultaneous orbital and polarimetric analyses, we derive the complete set of orbital parameters, including the inclination. The spectra are disentangled and spectroscopically analyzed, and an analysis of the wind-wind collision zone is conducted.
Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/J/PAZh/42/200
- Title:
- Dispersion measure of Milky Way and MC pulsars
- Short Name:
- J/PAZh/42/200
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A number of recent studies indicates a significant amount of ionized gas in a form of the hot gas halo around the Milky Way. The halo extends over the region of 100 kpc and may be acountable for the missing baryon mass. In this paper we calculate the contribution of the proposed halo to the dispersion measure (DM) of the pulsars. The Navarro, Frenk, and White (NFW), Maller and Bullock (MB), and Feldmann, Hooper, and Gnedin (FHG) density distributions are considered for the gas halo. The data set includes pulsars with the distance known independently from the DM, e.g., pulsars in globular clusters, LMC, SMC and pulsars with known parallax. The results exclude the NFW distribution for the hot gas, while the more realisticMB and FHG models are compatible with the observed dispersion measure.
143. 30 Dor
- ID:
- ivo://CDS.VizieR/J/ApJ/413/604
- Title:
- 30 Dor
- Short Name:
- J/ApJ/413/604
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- (no description available)
- ID:
- ivo://CDS.VizieR/II/187A
- Title:
- 30 Doradus OB Associations
- Short Name:
- II/187A
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Johnson UBV photometry is presented for 2395 stars in the OB associations of 30 Doradus in the Large Magellanic Cloud. The CCD fields cover an area of 50 square arcminutes in the central region. The entire catalog (exclusive of the dense core cluster R136) is photometrically complete to V=B=18mag and U=17mag, although the completeness magnitudes are fainter for regions with less nebular contamination.
- ID:
- ivo://CDS.VizieR/J/AJ/141/43
- Title:
- Dust properties in LMC molecular clouds
- Short Name:
- J/AJ/141/43
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The objective of this paper is to construct a catalog providing the dust properties and the star formation efficiency (SFE) of the molecular clouds in the Large Magellanic Cloud (LMC). We use the infrared (IR) data obtained with the Spitzer Space Telescope as part of the "Surveying the Agents of a Galaxy's Evolution" Legacy survey as well as the IRAS data. We also work with extinction (Av) maps of the LMC. A total of 272 molecular clouds have been detected in the LMC in a previous molecular survey, accounting for 230 giant molecular clouds (GMCs) and 42 smaller clouds. We perform correlations between the IR emission/extinction and atomic and molecular gas tracers.
- ID:
- ivo://CDS.VizieR/J/MNRAS/451/4346
- Title:
- Early-type stars in SMC and LMC
- Short Name:
- J/MNRAS/451/4346
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We employ CaII K and NaI D interstellar absorption-line spectroscopy of early-type stars in the Large and Small Magellanic Clouds (LMC, SMC) to investigate the large- and small-scale structure in foreground intermediate- and high-velocity clouds (I/HVCs). Data include FLAMES-GIRAFFE CaII K observations of 403 stars in four open clusters, plus FEROS or UVES spectra of 156 stars in the LMC and SMC. The FLAMES observations are amongst the most extensive probes to date of CaII structures on ~20-arcsec scales in Magellanic I/HVCs. From the FLAMES data within a 0.5{deg} field of view, the CaII K equivalent width in the I/HVC components towards three clusters varies by factors of >=10. There are no detections of molecular gas in absorption at intermediate or high velocities, although molecular absorption is present at LMC and Galactic velocities towards some sightlines. The FEROS/UVES data show CaII K I/HVC absorption in ~60 per cent of sightlines. The range in the CaII/NaI ratio in I/HVCs is from -0.45 to +1.5dex, similar to previous measurements for I/HVCs. In 10 sightlines we find CaII/Oi ratios in I/HVC gas ranging from 0.2 to 1.5dex below the solar value, indicating either dust or ionization effects. In nine sightlines I/HVC gas is detected in both Hi and CaII at similar velocities, implying that the two elements form part of the same structure.
- ID:
- ivo://CDS.VizieR/J/AJ/150/1
- Title:
- Eclipse timings of 27 eclipsing binaries in the SMC
- Short Name:
- J/AJ/150/1
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the periods of apsidal motion for 27 early-type eclipsing binaries with high eccentricity located in the Small Magellanic Cloud. New times of minima were derived from the light curves constructed by the MACHO, Optical Gravitational Lensing Experiment (OGLE)-II, and OGLE-III survey data. The eclipse timing diagrams of the binary systems were analyzed using those timings and the elements of apsidal motions were obtained in detail for the first time. The apsidal motion periods of all systems were estimated by detailed analysis of both eclipse timings and light curves; a strong correlation value between both methods is shown. We confirm that OGLE-SMC-ECL-2194 shows the shortest known apsidal motion period of 7.1yr in a detached system with main sequence stars. Nineteen systems show intermediate apsidal motion periods between 10 and 100yr, and seven systems exhibit long apsidal periods of more than 100yr.
- ID:
- ivo://CDS.VizieR/J/A+AS/109/447
- Title:
- Eclipsing binaries EROS catalogue
- Short Name:
- J/A+AS/109/447
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Catalogue and photometry of eclipsing binary stars in the bar of the LMC obtained from observations in two colours made during 1991-92 by the French EROS project.
- ID:
- ivo://CDS.VizieR/J/MNRAS/443/432
- Title:
- Eclipsing binaries in LMC
- Short Name:
- J/MNRAS/443/432
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a catalogue of 1768 eclipsing binary stars (EBs) detected in the Large Magellanic Cloud (LMC) by the second generation of the EROS survey (hereinafter EROS-2); 493 of them are new discoveries located in outer regions (out of the central bar) of the LMC. These sources were originally included in a list of candidate classical Cepheids (CCs) extracted from the EROS-2 catalogue on the basis of the period (0.89<P_EROS_<15.85d) versus luminosity [13.39<<B_EROS_><17.82mag] diagram. After visual inspection of the light curves we reclassified them as eclipsing binaries. They have blue colours (B_EROS_-R_EROS_<0.2mag) hence we classed them as hot eclipsing binaries (HEBs) containing hot massive components: main sequence (MS) stars or blue giants. We present Ks-band light curves for 999 binaries from our sample that have a counterpart in the VISTA near-infrared ESO public survey of the Magellanic Clouds system (VMC). We provide spectral classifications of 13 HEBs with existing spectroscopy. We divided our sample into contact-like binaries and detached/semi-detached systems based on both visual inspection and the parameters of the Fourier decomposition of the light curves and analysed the period-luminosity (PL) relations of the contact-like systems using the R_EROS_ and Ks magnitudes at maximum light. The contact-like binaries in our sample do not follow PL relations. We analysed the sample of contact binaries from the OGLE III catalogue and confirmed that PL_I_ and PL_K_ sequences are defined only by eclipsing binaries containing a red giant component.
- ID:
- ivo://CDS.VizieR/J/AcA/66/421
- Title:
- Eclipsing binaries in the Magellanic System
- Short Name:
- J/AcA/66/421
- Date:
- 22 Feb 2022
- Publisher:
- CDS
- Description:
- We present the collection of eclipsing binaries in the Large and Small Magellanic Clouds, based on the OGLE survey. It contains 48605 systems, 40204 belonging to the LMC and 8401 to the SMC. Out of the total number of presented here binaries, 16374 are the new discoveries. We present the time-series photometry obtained for the selected objects during the fourth phase of the OGLE project. The catalog has been created using a two step machine learning procedure based on the Random Forest algorithm.
