- 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/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/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/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/MNRAS/364/117
- Title:
- OGLE2 Mira variables in the Galactic bulge
- Short Name:
- J/MNRAS/364/117
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have extracted a total of 1968 Mira variables from the Optical Gravitational Lensing Experiment II (OGLE-II) data base in the Galactic bulge region. Among them, 1960 are associated with 2 Micron All-sky Survey (2MASS) sources, and 1541 are further identified with Midcourse Space Exploration (MSX) point sources. Their photometric properties are compared with those of Mira variables in the Large and Small Magellanic Clouds. We have found that mass-losing stars with circumstellar matter are reddened such that the colour dependence of the absorption coefficient is similar to that of interstellar matter. We also discuss the structure of the bulge. The surface number density of the bulge Mira variables is well correlated with the 2.2-m surface brightness obtained by the Cosmic Background Explorer (COBE) satellite. Using this relation, the total number of Mira variables in the bulge is estimated to be about 6x10^5^. The logP-K relation of the Mira variables gives their space distribution which supports the well-known asymmetry of the bar-like bulge.
- ID:
- ivo://CDS.VizieR/J/AcA/46/389
- Title:
- OGLE miscellaneous variable stars
- Short Name:
- J/AcA/46/389
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The first catalog of chromospherically active and ellipsoidal variable stars in the OGLE database is presented. The periods, the observed magnitudes and colors, their values free of interstellar extinction, and Fourier coefficients of light modulation are given for 549 stars. New color-magnitude diagrams based on new color determinations are presented. The chromospherically active stars are all among the bulge red giants, while the ellipsoidal binary stars are near the disk main sequence turn-off point. A discovery of a small group of very red (2<(V-I)_0_<6) and bright, chromospherically active bulge giants (I_0_=13mag) is also reported.
927. 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
928. OGLE RR Lyrae in SMC
- ID:
- ivo://CDS.VizieR/J/MNRAS/415/1366
- Title:
- OGLE RR Lyrae in SMC
- Short Name:
- J/MNRAS/415/1366
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have performed the Fourier decomposition analysis of 11-yr V-band light curves of a carefully selected sample of 100 RR Lyrae variables, detected in the central regions of the Small Magellanic Cloud (SMC), with the Optical Gravitational Lensing Experiment, phases II and III. The sample consisted of 84 fundamental mode pulsators (RRab stars) and 16 first-overtone pulsators (RRc stars). The Fourier decomposition parameters were used to derive metal abundances and distance moduli for these RR Lyrae variables.
- ID:
- ivo://CDS.VizieR/J/AcA/48/113
- Title:
- OGLE RR Lyrae VI photometry
- Short Name:
- J/AcA/48/113
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We analyze the mean luminosity of three samples of field RRab Lyr stars observed in the course of the OGLE microlensing experiment: 73 stars from the Galactic bulge and 110 and 128 stars from selected fields in the LMC and SMC, respectively. The fields are the same as in the recent distance determination to the Magellanic Clouds with the red clump stars method by Udalski et al. (1998AcA....48....1U). We determine the relative distance scale Galactic Bulge: 0.194+/-0.010; LMC: 1.00 ; SMC: 1.30+/-0.08. We calibrate our RR Lyr distance scale with the recent calibration of Gould and Popowski (1998ApJ...508..844G) based on statistical parallaxes. We obtain the following distance moduli to the Galactic bulge, LMC and SMC: m-M=14.5+/-0.15, m-M=18.09+/-0.16 and m-M=18.66+/-0.16mag.
- ID:
- ivo://CDS.VizieR/J/A+AS/125/343
- Title:
- OGLE RR Lyr stars in omega Cen
- Short Name:
- J/A+AS/125/343
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Table 1 lists light curve parameters and rectangular coordinates for variables OGLEGC 71-211. Table 2 contains equatorial coordinates of variables OGLEGC 71-211. Tables (table3 to 203) contain V-band light curves for variables OGLEGC71-211.
