Search

Start Over Subject variable stars
1581. VI light curves of LMC RR Lyrae stars
ID:
ivo://CDS.VizieR/J/AcA/59/1
Title:
VI light curves of LMC RR Lyrae stars
Short Name:
J/AcA/59/1
Date:
21 Oct 2021
Publisher:
CDS
Description:
The third part of the OGLE-III Catalog of Variable Stars comprises 24 906 RR Lyr stars in the Large Magellanic Cloud (LMC). This sample consists of 17 693 fundamental-mode (RRab), 4958 first-overtone (RRc), 986 double-mode (RRd) and 1269 suspected second-overtone (RRe) pulsators. 66 objects are foreground Galactic RR Lyr stars. The catalog data include basic photometric and astrometric properties of these RR Lyr stars, multi-epoch VI photometry and finding charts.
1582. VI light curves of MC type II Cepheids
ID:
ivo://CDS.VizieR/J/AcA/68/89
Title:
VI light curves of MC type II Cepheids
Short Name:
J/AcA/68/89
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a nearly complete collection of type II Cepheids in the Magellanic System. The sample consists of 338 objects: 285 and 53 variables in the Large and Small Magellanic Clouds, respectively. Based on the pulsation periods and light-curve morphology, we classified 118 of our type II Cepheids as BL Her, 120 as W Vir, 34 as peculiar W Vir, and 66 as RV Tau stars. For all objects, we publish time-series VI photometry obtained during the OGLE-IV survey, from 2010 to the end of 2017. We present the most interesting individual objects in our collection: 16 type II Cepheids showing additional eclipsing or ellipsoidal variability, two RV Tau variables more than 2.5mag fainter than other stars of this type in the LMC, an RVb star that drastically decreased the amplitude of the long-period modulation, type II Cepheids exhibiting significant amplitude and period changes, and an RV Tau star which undergoes interchanges of deep and shallow minima. We show that peculiar W Vir stars have markedly different spatial distribution than other subclasses of type II Cepheids, which indicates different evolutionary histories of these objects.
1583. VI light curves of NGC 247 Cepheids
ID:
ivo://CDS.VizieR/J/AJ/136/1770
Title:
VI light curves of NGC 247 Cepheids
Short Name:
J/AJ/136/1770
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report on the discovery of a Cepheid population in the Sculptor Group spiral galaxy NGC 247 for the first time. On the basis of wide-field images collected in photometric surveys in V and I bands that were conducted with three different telescopes and cameras, 23 Cepheid variables were discovered with periods ranging from 17 to 131 days.
1584. Vi light curves of NGC6333 variables
ID:
ivo://CDS.VizieR/J/MNRAS/434/1220
Title:
Vi light curves of NGC6333 variables
Short Name:
J/MNRAS/434/1220
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report CCD V and I time series photometry of the globular cluster NGC 6333 (M9). The technique of difference image analysis has been used, which enables photometric precision better than 0.05mag for stars brighter than V~19.0mag, even in the crowded central regions of the cluster. The high photometric precision has resulted in the discovery of two new RRc stars, three eclipsing binaries, seven long-term variables and one field RRab star behind the cluster. A detailed identification chart and equatorial coordinates are given for all the variable stars in the field of our images of the cluster. Our data together with the literature V-data obtained in 1994 and 1995 allowed us to refine considerably the periods for all RR Lyrae stars. The nature of the new variables is discussed. We argue that variable V12 is a cluster member and an Anomalous Cepheid. Secular period variations, double-mode pulsations and/or the Blazhko-like modulations in some RRc variables are addressed. Through the light-curve Fourier decomposition of 12 RR Lyrae stars we have calculated a mean metallicity of [Fe/H]_ZW_=-1.70+/-0.01(statistical)+/-0.14(systematic) or [Fe/H]_UVES_=-1.67+/-0.01(statistical)+/-0.19(systematic). Absolute magnitudes, radii and masses are also estimated for the RR Lyrae stars. A detailed search for SX Phe stars in the Blue Straggler region was conducted but none were discovered. If SX Phe exist in the cluster then their amplitudes must be smaller than the detection limit of our photometry. The colour-magnitude diagram has been corrected for heavy differential reddening using the detailed extinction map of the cluster of Alonso-Garcia et al. (2012, Cat. J/AJ/143/70). This has allowed us to set the mean cluster distance from two independent estimates; from the RRab and RRc absolute magnitudes, we find 8.04+/-0.19 and 7.88+/-0.30kpc, respectively.
1585. VI light curves of RRL stars in M31
ID:
ivo://CDS.VizieR/J/ApJ/765/71
Title:
VI light curves of RRL stars in M31
Short Name:
J/ApJ/765/71
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the first evidence that Oosterhoff type II globular clusters exist in the Andromeda galaxy (M31). On the basis of time-series photometry of the moderately metal-poor ([Fe/H]~-1.6dex) M31 globular cluster G11, obtained with the Wide Field Planetary Camera 2 on board the Hubble Space Telescope, we detected and derived periods for 14 RR Lyrae stars, of which five are found to lie inside the cluster tidal radius. They include three fundamental-mode (RRab) and two first-overtone (RRc) pulsators, with average periods <P_ab_>=0.70 days, and <P_c_>=0.40 days, respectively. These mean periods and the position of the cluster variable stars in the period-amplitude and period-metallicity diagrams all suggest that G11 is likely to be an Oosterhoff type II globular cluster. This appears to be in agreement with the general behavior of Milky Way globular clusters with similar metallicity and horizontal branch morphology.
1586. VI light curves of SMC and LMC RR Lyrae
ID:
ivo://CDS.VizieR/J/AcA/66/131
Title:
VI light curves of SMC and LMC RR Lyrae
Short Name:
J/AcA/66/131
Date:
22 Feb 2022
Publisher:
CDS
Description:
We present the largest collection of RR Lyrae stars in the Magellanic System and in its foreground. The sample consists of 45451 RR Lyr stars, of which 39082 were detected toward the Large Magellanic Cloud and 6369 toward the Small Magellanic Cloud. We provide long-term time-series photometric measurements collected during the fourth phase of the Optical Gravitational Lensing Experiment (OGLE-IV). We discuss several potential astrophysical applications of our collection: investigation of the structure of the Magellanic Clouds and the Galactic halo, studies of the globular clusters in the Magellanic System, analysis of double-mode RR Lyr stars, and search for RR Lyr stars in eclipsing binary systems.
1587. VI light curves of SMC classical Cepheids
ID:
ivo://CDS.VizieR/J/AcA/60/17
Title:
VI light curves of SMC classical Cepheids
Short Name:
J/AcA/60/17
Date:
21 Oct 2021
Publisher:
CDS
Description:
The seventh part of the OGLE-III Catalog of Variable Stars (OIII-CVS) consists of 4630 classical Cepheids in the Small Magellanic Cloud (SMC). The sample includes 2626 fundamental-mode (F), 1644 first-overtone (1O), 83 second-overtone (2O), 59 double-mode F/1O, 215 double-mode 1O/2O, and three triple-mode classical Cepheids. For each object basic parameters, multi-epoch VI photometry collected within 8 or 13 years of observations, and finding charts are provided in the OGLE Internet archive.
1588. VI light curves of SMC long-period variables
ID:
ivo://CDS.VizieR/J/AcA/61/217
Title:
VI light curves of SMC long-period variables
Short Name:
J/AcA/61/217
Date:
21 Oct 2021
Publisher:
CDS
Description:
The thirteenth part of the OGLE-III Catalog of Variable Stars (OIII-CVS) contains 19 384 long-period variables (LPVs) detected in the Small Magellanic Cloud. The sample is composed of 352 Mira stars, 2222 semiregular variables (SRVs) and 16 810 OGLE Small Amplitude Red Giants (OSARGs). Sources are divided into oxygen-rich and carbon-rich stars. The catalog includes time-series VI photometry obtained between 1997 and 2009.
1589. VI light curves of SMC RR Lyrae
ID:
ivo://CDS.VizieR/J/AcA/60/165
Title:
VI light curves of SMC RR Lyrae
Short Name:
J/AcA/60/165
Date:
21 Oct 2021
Publisher:
CDS
Description:
The ninth part of the OGLE-III Catalog of Variable Stars (OIII-CVS) comprises RR Lyr stars in the Small Magellanic Cloud (SMC). Our sample consists of 2475 variable stars, of which 1933 pulsate in the fundamental mode (RRab), 175 are the first overtone pulsators (RRc), 258 oscillate simultaneously in both modes (RRd) and 109 stars are suspected second-overtone pulsators (RRe). 30 objects are Galactic RR Lyr stars seen in the foreground of the SMC.
1590. VI light curves of SMC type II Cepheids
ID:
ivo://CDS.VizieR/J/AcA/60/91
Title:
VI light curves of SMC type II Cepheids
Short Name:
J/AcA/60/91
Date:
21 Oct 2021
Publisher:
CDS
Description:
The eighth part of the OGLE-III Catalog of Variable Stars (OIII-CVS) contains type II Cepheids in the Small Magellanic Cloud (SMC). The sample consists of 43 objects, including 17 BL Her, 17 W Vir and 9 RV Tau stars (first examples ever found in the SMC). Seven stars have been classified as peculiar W Vir stars - a recently identified subclass of type II Cepheids. These stars have distinctive light curves, are brighter and bluer than the ordinary W Vir variables. We confirm that a large fraction of the peculiar W Vir stars are members of binary systems.

Limit your search