Results 1 to 10 of about 411 (243)

A Three-dimensional Map of the Milky Way Using 66,000 Mira Variable Stars

The Astrophysical Journal Supplement Series, 2023
We study the three-dimensional structure of the Milky Way using 65,981 Mira variable stars discovered by the Optical Gravitational Lensing Experiment survey.
Patryk Iwanek, Radosław Poleski, Szymon Kozłowski, Igor Soszyński, Paweł Pietrukowicz, Makiko Ban, Jan Skowron, Przemysław Mróz, Marcin Wrona, Andrzej Udalski, Michał K. Szymański, Dorota M. Skowron, Krzysztof Ulaczyk, Mariusz Gromadzki, Krzysztof Rybicki, Milena Ratajczak   +15 more
doaj   +4 more sources

MONITORING OF SPECTRAL VARIATIONS OF MIRA-TYPE AND SEMIREGULAR VARIABLE STARS

Odessa Astronomical Publications, 2017
The results of monitoring of a sample of late-type variable stars (Mira Ceti-type and semiregulars) are reported. Since 1980 a sample of 60 stars has been observed in the maser line of the H2O molecule at a wavelength of 1.35 cm. These observations are
G. M. Rudnitskij
doaj   +3 more sources

A Distance Measurement to M33 Using Optical Photometry of Mira Variables

The Astronomical Journal, 2023
We present a systematic analysis to determine and improve the pulsation periods of 1637 known long-period Mira variables in M33 using gri -band light curves spanning ∼18 yr from several surveys, including the M33 variability survey, Panoramic Survey ...
Jia-Yu Ou, Chow-Choong Ngeow, Anupam Bhardwaj, Matthew J. Graham, Russ R. Laher, Frank J. Masci, Reed Riddle   +6 more
doaj   +1 more source

Miras as a distance indicator in the CSST, JWST, and Gaia era

Frontiers in Astronomy and Space Sciences, 2023
Mira variables are important distance indicators owing to the clear period–luminosity relation at infrared wavelengths. We have compiled a sample of 343 Galactic Miras selected from the American Association of Variable Star Observers database and Gaia ...
Yan Sun, Jingdong Zhang, Jingdong Zhang, Bo Zhang, Shuangjing Xu, Xiaofeng Mai, Xiaofeng Mai, Hao Ding, Wen Chen, Wen Chen, Shiming Wen   +10 more
doaj   +1 more source

Shocks and Photoionization of the Inner 650 au Jet of the Interacting Binary Star R Aquarii from Multiwavelength Hubble Space Telescope Observations

The Astrophysical Journal, 2023
Astrophysical jets are present in a range of environments, including young stellar objects, X-ray binaries, and active galactic nuclei, but their formation is still not fully understood.
Caroline D. Huang, Margarita Karovska, Warren Hack, John C. Raymond, Rodolfo Montez Jr., Vinay L. Kashyap   +5 more
doaj   +1 more source

SEARCH FOR VARIABLE STARS AND THEIR STUDY

Odessa Astronomical Publications, 2016
We search for variable stars and study them using our CCD observations, observations available in the CSS, NSVS, ASAS-3 and Super-WASP online public archives.Our CCD observations were performed using the Zeiss- 1000 telescope of the V.G.
R. I. Kokumbaeva, V. A. Zakhozhay, A. V. Khruslov   +2 more
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INFLUENCE OF SHOCK WAVES ON THE LIGHT CURVES OF LONG-PERIOD VARIABLES

Odessa Astronomical Publications, 2017
The shapes of light curves of Mira-type variable stars is analyzed. It is shown that some features of the light curves may be explained by passage of shock waves in the stars' atmospheres. In particular, it is noted that "steps" of the ascending branches
L. S. Kudashkina, G. M. Rudnitskij
doaj   +1 more source

ATLAS OF LIGHT CURVES OF FAINT MIRA-TYPE STARS. STATISTICAL RELATIONS BETWEEN THE CHARACTERISTICS OF SMOOTHED PHASE LIGHT CURVES

Odessa Astronomical Publications, 2010
We propose a set of the photometric parameters which could be useful for the classiffication of the pulsating Mira-type stars and related objects and determination of the EAGB and TPAGB stages of the stellar evolution.
L. S. Kudashkina, I. L. Andronov
doaj   +1 more source

Convection Theory and Related Problems in Stellar Structure, Evolution, and Pulsational Stability II. Turbulent Convection and Pulsational Stability of Stars

Frontiers in Astronomy and Space Sciences, 2021
Using our non-local and time-dependent theory of convection and a fixed set of convective parameters (C1,  C2/C1 ,   C3)= (0.70,   0.50,   3.0) calibrated against the Sun, the linear non-adiabatic oscillations for evolutionary models with masses 1–20 M ...
Da-run Xiong
doaj   +1 more source

Zwicky Transient Facility and Globular Clusters: The gr-band Period–Luminosity Relations for Mira Variables at Maximum Light and their Applications to Local Galaxies

The Astronomical Journal, 2023
Based on 14 Miras located in seven globular clusters, we derived the first gr -band period–luminosity (PL) at maximum light for the large-amplitude Mira variables using the multiyear light-curve data collected from the Zwicky Transient Facility (ZTF ...
C.-C. Ngeow, Jia-Yu Ou, Anupam Bhardwaj, Josiah Purdum, Ben Rusholme, Avery Wold   +5 more
doaj   +1 more source