Acta Astronomica is an academic journal focused on the field of astronomy, dedicated to publishing high-quality research papers and review articles that cover various aspects of astronomy.

《Acta Astronomica》是一本专注于天文学领域的学术期刊，致力于发表高质量的研究论文和综述文章，涵盖天文学的各个方面。

Acta Astronomica

A. Hamanowicz

P. Pietrukowicz

A. Udalski

P. Mróz

I. Soszyński

M. K. Szymański

J. Skowron

R. Poleski

Ł. Wyrzykowski

S. Kozłowski

M. Pawlak

K. Ulaczyk

OGLE Study of the Sagittarius Dwarf Spheroidal Galaxy and its M54 Globular Cluster

OGLE 对人马座矮椭球星系及其M54球状星团的观测研究

We analyzed a sample of 9418 fundamental-mode and first-overtone Classical Cepheids from the OGLE-IV Collection of Classical Cepheids. The distance to each Cepheid was calculated using the period-luminosity relation for the Wesenheit magnitude, fitted to our data. 
The classical Cepheids in the LMC are situated mainly in the bar and in the northern arm. The eastern part of the LMC is closer to us and the plane fit to the whole LMC sample yields the inclination $i=24.2\pm0.7$ deg and position angle ${\rm P.A.}=151.4\pm1.7$ deg. We redefined the LMC bar by extending it in the western direction and found no offset from the plane of the LMC contrary to previous studies. On the other hand, we found that the northern arm is offset from a plane by about $-0.5$ kpc, which was not observed before. The age distribution of the LMC Cepheids shows one maximum at about 100 Myr. 
We demonstrate that the SMC has a non-planar structure and can be described as an extended ellipsoid. We identified two large ellipsoidal off-axis structures in the SMC. The northern one is located closer to us and is younger, while the south-western is farther and older. The age distribution of the SMC Cepheids is bimodal with one maximum at 110 Myr, and another one at 220 Myr. Younger stars are located in the closer part of this galaxy while older ones are more distant. 
We classified nine Cepheids from our sample as Magellanic Bridge objects. These Cepheids show a large spread in three-dimensions although five of them form a connection between the Clouds. The closest one is closer than any of the LMC Cepheids, while the farthest one -- farther than any SMC Cepheid. All but one Cepheids in the Magellanic Bridge are younger than 300 Myr. The oldest one can be associated with the SMC Wing.

A. M. Jacyszyn-Dobrzeniecka

D. M. Skowron

OGLE-ing the Magellanic System: Three-Dimensional Structure of the Clouds and the Bridge Using Classical Cepheids

利用经典造父变星研究麦哲伦系统：云与桥的三维结构

I.S. Savanov

V.I. Puzin

E.S. Dmitrienko

S.V. Karpov

G.M. Beskin

A.V. Biryukov

S.F. Bondar

E.A. Ivanov

E.V. Katkova

N. Orekhova

A.V. Perkov

V.V. Sasyuk

I.I. Romanyuk

E.A. Semenko

D. Kudryavtsev

S. Karmakar

J.C. Pandey

S.B. Pandey

S.M. Joshi and

Photometric Observations of LO Peg in 2014–2015

2014-2015年LO Peg的光度观测

We present a three-dimensional analysis of a sample of 22 859 type $ab$ RR Lyrae stars in the Magellanic System from the OGLE-IV Collection of RR Lyrae stars. The distance to each object was calculated based on its photometric metallicity and a theoretical relation between color, absolute magnitude and metallicity. The LMC RR Lyrae distribution is very regular and does not show any substructures. We demonstrate that the bar found in previous studies may be an overdensity caused by blending and crowding effects. The halo is asymmetrical with a higher stellar density in its north-eastern area, which is also located closer to us. Triaxial ellipsoids were fitted to surfaces of a constant number density. Ellipsoids farther from the LMC center are less elongated and slightly rotated toward the SMC. The inclination and position angle change significantly with the $a$ axis size. The median axis ratio is $1:1.23:1.45$. The RR Lyrae distribution in the SMC has a very regular, ellipsoidal shape and does not show any substructures or asymmetries. All triaxial ellipsoids fitted to surfaces of a constant number density have virtually the same shape (axis ratio) and are elongated along the line of sight. The median axis ratio is $1:1.10:2.13$. The inclination angle is very small and thus the position angle is not well defined. We present the distribution of RR Lyrae stars in the Magellanic Bridge area, showing that the Magellanic Clouds' halos overlap. A comparison of the distributions of RR Lyrae stars and Classical Cepheids shows that the former are significantly more spread and distributed regularly, while the latter are very clumped and form several distinct substructures.

Anna M. Jacyszyn-Dobrzeniecka

OGLE-ing the Magellanic System: Three-Dimensional Structure of the Clouds and the Bridge using RR Lyrae Stars

利用RR Lyrae星研究麦哲伦系统：云层与桥的三维结构

Searching for Potential Mergers among 22 500 Eclipsing Binary Stars in the OGLE-III Galactic Bulge Fields

在OGLE-III银河系核球区域22500颗食双星中寻找潜在合并目标

J. M. Benkő

Á. Sódor

A. Pál

Photometric and Spectroscopic Investigations of the Galactic Field RRc Candidates V764 Mon and HY Com

银河场RRc候选体V764 Mon和HY Com的光度和光谱研究

银河系场RRc候选体V764 Mon和HY Com的光度和光谱研究

Abbreviation
Journal Impact	2.04
Quartiles(Global)	ASTRONOMY & ASTROPHYSICS(Q2)

ISSN	0001-5237
h-index	66

Publication Information	Publisher: Copernicus Foundation for Polish Astronomy，Publishing cycle: Quarterly，Journal Type: journal，Open Access Journals: No
Basic data	Year of publication: 1996，Proportion of original research papers: 100.00%，Self Citation Rate:10.00%， Gold OA Rate: 0.00%
Average review cycle	网友分享经验：>12周，或约稿
Average recruitment ratio	网友分享经验：较易

Acta Astronomica

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OGLE Study of the Sagittarius Dwarf Spheroidal Galaxy and its M54 Globular Cluster

OGLE-ing the Magellanic System: Three-Dimensional Structure of the Clouds and the Bridge Using Classical Cepheids

Photometric Observations of LO Peg in 2014–2015

OGLE-ing the Magellanic System: Three-Dimensional Structure of the Clouds and the Bridge using RR Lyrae Stars

Searching for Potential Mergers among 22 500 Eclipsing Binary Stars in the OGLE-III Galactic Bulge Fields

Photometric and Spectroscopic Investigations of the Galactic Field RRc Candidates V764 Mon and HY Com

Photometric and Spectroscopic Investigations of the Galactic Field RRc Candidates V764 Mon and HY Com

Photometric and Spectroscopic Investigations of the Galactic Field RRc Candidates V764 Mon and HY Com

Photometric and Spectroscopic Investigations of the Galactic Field RRc Candidates V764 Mon and HY Com

Photometric and Spectroscopic Investigations of the Galactic Field RRc Candidates V764 Mon and HY Com