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We present the design and first results of a real-time search for transients within the 650 sq. deg. area around the Magellanic Clouds, conducted as part of the OGLE-IV project and aimed at detecting supernovae, novae and other events. The…

Over the years, directed surveys and incidental spectroscopy have identified 12 Wolf-Rayet (WR) stars in the SMC and 139 in the LMC, numbers which are often described as "essentially} complete." Yet, new WRs are discovered in the LMC almost…

太阳与恒星天体物理 · 物理学 2015-06-19 Philip Massey , Kathryn F. Neugent , Nidia Morrell , D. John Hillier

The Optical Gravitational Lensing Experiment identified over 1,800 carbon-rich Mira and semi-regular variables in the Small Magellanic Cloud. Multi-epoch infrared photometry reveals that the semi-regulars and Miras follow different…

太阳与恒星天体物理 · 物理学 2015-05-15 G. C. Sloan , E. Lagadec , K. E. Kraemer , M. L. Boyer , S. Srinivasan , I. McDonald , A. A. Zijlstra

We present J, H, Ks photometry from the the Multi conjugate Adaptive optics Demonstrator (MAD), a visitor instrument at the VLT, of a resolved stellar population in a small crowded field in the bar of the Large Magellanic Cloud near the…

天体物理仪器与方法 · 物理学 2015-05-30 G. Fiorentino , E. Tolstoy , E. Diolaiti , E. Valenti , M. Cignoni , A. D. Mackey

A survey of extended objects in the Large Magellanic Cloud was carried out on the ESO/SERC R and J Sky Survey Atlases, checking entries in previous catalogs and searching for new objects. The census provided 6659 objects including star…

天体物理学 · 物理学 2008-11-26 Eduardo L. D. Bica , Henrique R. Schmitt , Carlos , M. Dutra , Humberto L. Oliveira

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…

We report on observations of the Large Magellanic Cloud with the Fermi Gamma-Ray Space Telescope. The LMC is clearly detected with the Large Area Telescope (LAT) and for the first time the emission is spatially well resolved in gamma-rays.…

高能天体物理现象 · 物理学 2019-08-14 Jürgen Knödlseder , Pierre Jean

We present a comprehensive analysis of the photometric variability of (presumably single) nitrogen-rich Wolf-Rayet (WN) stars in the Magellanic Clouds, using long-term observations from the OGLE survey. Our sample comprises 47 stars with no…

太阳与恒星天体物理 · 物理学 2026-02-06 Jana Marković , Guadalupe Sáez-Cano , Yaël Nazé , María del Mar Rubio-Díez , Igor Soszyński , Andrzej Udalski

The number of star clusters that populate the Large Magellanic Cloud (LMC) at deprojected distances < 4 deg has been recently found to be nearly double the known size of the system. Because of the unprecedented consequences of this outcome…

星系天体物理 · 物理学 2018-02-14 Andrés E. Piatti

We present determination of age of clusters from 2.4 square degree region of the SMC bar. The photometric data were taken from the BVI maps of the SMC and catalog of clusters in this galaxy obtained during the OGLE-II microlensing survey.…

天体物理学 · 物理学 2007-05-23 G. Pietrzynski , A. Udalski

The stellar mass-luminosity relation is poorly constrained by observations for high mass stars. We describe our program to find eclipsing massive binaries in the Magellanic Clouds using photometry of regions rich in massive stars, and our…

太阳与恒星天体物理 · 物理学 2015-06-03 Philip Massey , Nidia I. Morrell , Kathryn F. Neugent , Laura R. Penny , Kathleen-DeGioia Eastwood , Douglas R. Gies

We present new reddening maps of the SMC and LMC based on the data of the third phase of the Optical Gravitational Lensing Experiment (OGLE III). We have used two different methods to derive optical reddening maps. We adopt a theoretical…

星系天体物理 · 物理学 2011-04-14 Raoul Haschke , Eva K. Grebel , Sonia Duffau

The Large Magellanic Cloud (LMC) has been observed by both the Midcourse Space Experiment (MSX) in the mid-infrared and the Two Micron All Sky Survey (2MASS) in the near-infrared. We have performed a cross-correlation of the 1806 MSX…

天体物理学 · 物理学 2009-11-06 Michael P. Egan , Schuyler D. Van Dyk , Stephan D. Price

We present new B, V, I photometry in the standard Johnson-Cousins photometric system of two regions near the bar of the Large Magellanic Cloud (LMC), one of which is very close to LMC field used for the "Coimbra test on the synthetic CMD…

天体物理学 · 物理学 2007-05-23 G. Clementini , A. Bragaglia , M. Maio , E. Carretta , R. G. Gratton , L. Di Fabrizio

The Large and Small Magellanic Clouds (LMC and SMC) are the Milky Way's nearest interacting galaxy pair, offering a unique laboratory for studying tidal effects on galactic disks. Despite extensive survey efforts, the three-dimensional…

The One Thousand and One Magellanic Fields (1001MC) survey aims to measure the kinematics and elemental abundances of many different stellar populations that sample the history of formation and interaction of the Magellanic Clouds. The…

The photometric data collected during 2001 season OGLE-III planetary/low luminosity object transit campaign were reanalyzed with the new transit search technique -- the BLS method by Kovacs, Zucker and Mazeh. In addition to all presented in…

天体物理学 · 物理学 2007-05-23 A. Udalski , K. Zebrun , M. Szymanski , M. Kubiak , I. Soszynski , O. Szewczyk , L. Wyrzykowski , G. Pietrzynski

We present the fifth part of the OGLE Catalog of Periodic Variable Stars in the Galactic bulge. 574 variable stars: 44 pulsating, 369 eclipsing and 161 miscellaneous type were detected in four fields located symmetrically in galactic…

天体物理学 · 物理学 2007-05-23 A. Udalski , A. Olech , M. Szymanski , J. Kaluzny , M. Kubiak , M. Mateo , W. Krzeminski , K. Z. Stanek

We present the first three-dimensional reddening maps of the Large and Small Magellanic Clouds (LMC and SMC) constructed using fundamental-mode RR Lyrae stars from the OGLE-IV survey. By applying a period-amplitude-color relation and a…

星系天体物理 · 物理学 2026-03-17 Shunxuan He , Yang Huang

The EROS-2 collaboration has conducted a survey of the Magellanic Clouds between July 1996 and February 2003 (6.7 years), in order to search for microlensing phenomena due to putative machos (massive astronomical compact halo objects).…

天体物理学 · 物理学 2007-05-23 Patrick Tisserand , Alain Milsztajn