- ID:
- ivo://CDS.VizieR/J/AcA/65/297
- Title:
- OGLE4 LMC and SMC Cepheids
- Short Name:
- J/AcA/65/297
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present here a nearly complete census of classical Cepheids in the Magellanic System. The sample extends the set of Cepheids published in the past by the Optical Gravitational Lensing Experiment (OGLE) to the outer regions of the Large (LMC) and Small Magellanic Cloud (SMC). The entire collection consists of 9535 Cepheids of which 4620 belong to the LMC and 4915 are members of the SMC. We provide the I- and V-band time-series photometry of the published Cepheids, their finding charts, and basic observational parameters. Based on this unique OGLE sample of Cepheids we present updated period-luminosity relations for fundamental, first, and second mode of pulsations in the I- and V-bands and for the WI extinction-free Wesenheit index. We also show the distribution of classical Cepheids in the Magellanic System. The OGLE collection contains several classical Cepheids in the Magellanic Bridge - the region of interaction between the Magellanic Clouds. The discovery of classical Cepheids and their estimated ages confirm the presence of young stellar population between these galaxies.
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- ID:
- ivo://CDS.VizieR/J/AcA/50/307
- Title:
- OGLE LMC BVI photometry
- Short Name:
- J/AcA/50/307
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the BVI photometric maps of the Large Magellanic Cloud. They contain BVI photometry and astrometry of more than 7 million stars from the central parts of the LMC. The data were collected during the second phase of the OGLE microlensing project. We discuss the accuracy of the data and present color-magnitude diagrams of all 26 fields observed by OGLE in the LMC. The BVI maps of the LMC are accessible electronically for the astronomical community from the OGLE Internet archive.
- ID:
- ivo://CDS.VizieR/J/AcA/49/543
- Title:
- OGLE LMC & SMC Cepheids VI photometry
- Short Name:
- J/AcA/49/543
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present Cepheids located in the close neighborhood of star clusters from the Magellanic Clouds. 204 and 132 such stars were found in the LMC and SMC, respectively. The lists of objects were constructed based on catalogs of Cepheids and star clusters, recently published by the OGLE-II collaboration. Location of selected Cepheids on the sky indicates that many of them are very likely cluster members. Photometric data of Cepheids and clusters are available from the OGLE Internet archive at URL: ftp://sirius.astrouw.edu.pl/ogle/ogle2/clusters/cepheids/
- ID:
- ivo://CDS.VizieR/J/AcA/50/337
- Title:
- OGLE LMC star clusters
- Short Name:
- J/AcA/50/337
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present results of age determination based on the standard procedure of isochrone fitting for about 600 star clusters younger than about 1.2Gyr from the central parts of the LMC. Comparison of age distributions of star clusters from the LMC and the SMC shows that cluster formation histories are different in these galaxies. The age distribution of the LMC clusters reveals bursty nature of cluster formation in this galaxy, with contrast to the relatively uniform distribution of cluster ages in the SMC. We detected three extended peaks in the distribution of ages of LMC clusters, located at about 7Myr, 125Myr and 0.8Gyr. All detected peaks have complex structure. While the structure of the youngest and the oldest peaks may be spurious due to accuracy of age determination, in the middle peak two evident sub-peaks at 100Myr and 160Myr are clearly seen. Similar peaks are seen in the distribution of ages of clusters from the SMC, which indicates that increased cluster formation ratio during these periods might be caused by the last encounter between the Magellanic Clouds. The sample of clusters from the LMC is overabundant in very young (<10Myr) anal old (>400Myr) clusters, and underabundant in clusters having ages in the range from 80 to 15Myr with respect to the studied sample of clusters from the SMC.
- ID:
- ivo://CDS.VizieR/J/AcA/49/521
- Title:
- OGLE LMC star clusters BVI photometry
- Short Name:
- J/AcA/49/521
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the catalog of star clusters found in the area of about 5.8 square degree in the central regions of the Large Magellanic Cloud. It contains data for 745 clusters. 126 of them are new objects. For each cluster equatorial coordinates, radius, approximate number of members and cross-identification are provided. Photometric data for all clusters presented in the catalog and Atlas consisting of finding charts and color-magnitude diagrams are available electronically from the OGLE Internet archive at URL: ftp://sirius.astrouw.edu.pl/ogle/ogle2/clusters/lmc
- ID:
- ivo://CDS.VizieR/J/AcA/65/233
- Title:
- OGLE Magellanic Clouds anomalous Cepheids
- Short Name:
- J/AcA/65/233
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a collection of 250 anomalous Cepheids (ACs) discovered in the OGLE-IV fields toward the Large (LMC) and Small Magellanic Cloud (SMC). The LMC sample is an extension of the OGLE-III Catalog of ACs published in 2008, while the SMC sample contains the first known bona fide ACs in this galaxy. The total sample is composed of 141 ACs in the LMC and 109 ACs in the SMC. All these stars pulsate in single modes: fundamental (174 objects) or first overtone (76 objects). Additionally, we report the discovery of four ACs located in the foreground of the Magellanic Clouds. These are the first unambiguously identified fundamental-mode ACs known in the Galactic field. We demonstrate that the coefficients {phi}21 and {phi}31 determined by the Fourier light curve decomposition are useful discriminators between classical Cepheids and ACs, at least in the LMC and in the field of the Milky Way. In the SMC, the light curve shapes and mean magnitudes of short-period classical Cepheids make them similar to ACs, which is a source of difficulties in the discrimination of both classes of pulsators. The presence of unidentified ACs in the catalogs of classical Cepheids may be partly responsible for the observed non-linearity of the period-luminosity relation observed for short-period Cepheids in the SMC. We compare spatial distributions of ACs, classical Cepheids and RR Lyr stars. We show that the distribution of ACs resembles that of old stars (RR Lyr variables), although in the LMC there are visible structures typical for young population (classical Cepheids): the bar and spiral arms. This may suggest that ACs are a mixture of relatively young stars and mergers of very old stars.
- ID:
- ivo://CDS.VizieR/J/AcA/61/199
- Title:
- OGLE3 Magellanic Clouds High proper motion stars
- Short Name:
- J/AcA/61/199
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of a search for High Proper Motion (HPM) stars, i.e., the ones with pm>100mas/yr, in the direction to the Magellanic Clouds. This sky area was not examined in detail as the high stellar density hampers efforts in performing high-quality astrometry.
- ID:
- ivo://CDS.VizieR/J/A+A/425/595
- Title:
- OGLE+2MASS+DENIS LPV in Magellanic Clouds
- Short Name:
- J/A+A/425/595
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The 68000 I-band light curves of variable stars detected by the OGLE survey (ftp://sirius.astrouw.edu.pl/ogle/ogle2/clusters) in the Large and Small Magellanic Clouds (MCs) are fitted by Fourier series, and also correlated with the DENIS (<II/228>) and 2MASS All-Sky Release (<II/246>) databases and with lists of spectroscopically confirmed M-, S- and C-stars. Lightcurves and the results of the lightcurve fitting (periods and amplitudes) and DENIS and 2MASS magnitudes are presented for 2277 M-,S-,C-stars in the MCs.
- ID:
- ivo://CDS.VizieR/J/AcA/50/355
- Title:
- OGLE Multiple Cluster Candidates in LMC
- Short Name:
- J/AcA/50/355
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present 100 multiple cluster candidates selected from the OGLE catalog of star clusters in the Large Magellanic Cloud. Statistical analysis shows that the significant fraction of these objects may constitute physical systems. Coeval ages of 102 components of multiple objects suggest their common origin. 53 components have very different ages. The comparison of the population of multiple clusters candidates from the SMC and the LMC shows that: a) distributions of sizes and ages of multiple and single clusters from the Magellanic Clouds are very similar, b) the difference of sizes of components of a given system is small, c) in both distributions of separation of multiple clusters from the LMC and SMC two peaks are seen at about 9pc and 15pc, d) both age distributions reveal peaks around 100Myr, which may be connected with the last encounter of the LMC and the SMC.
420. OGLE RR Lyrae in LMC
- ID:
- ivo://CDS.VizieR/J/AcA/53/93
- Title:
- OGLE RR Lyrae in LMC
- Short Name:
- J/AcA/53/93
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the catalog of RR Lyr stars discovered in a 4.5 square degrees area in the central parts of the Large Magellanic Cloud (LMC). Presented sample contains 7612 objects, including 5455 fundamental mode pulsators (RRab), 1655 first-overtone (RRc), 272 second-overtone (RRe) and 230 double-mode RR Lyr stars (RRd). Additionally we attach alist of several dozen other short-period pulsating variables. The catalog data include astrometry, periods, BVI photometry, amplitudes, and parameters of the Fourier decomposition of the I-band light curve of each object. We provide a list of six LMC star clusters which contain RR Lyr stars. The richest cluster, NGC 1835, hosts 84 RR Lyr variables. The period distribution of these stars suggests that NGC1835 shares features of Oosterhoff type I and type II groups. All presented data, including individual BVI observations and finding charts are available from the OGLE Internet archive at ftp://sirius.astrouw.edu.pl/ogle/ogle2/var_stars/lmc/rrlyr
