Results 11 to 20 of about 411 (243)

LINEAR PULSATION CHARACTERISTICS OF MIRA VARIABLE STARS [PDF]

Journal of Sciences, Islamic Republic of Iran, 2003
The linear adiabatic pulsation-periods of Mira variable stars have been derived. Approximately 2701[1]models were calculated for M = 0.7 MΘ to 2 MΘ stars with radii from 180 RΘ to 340 RΘ and luminosities from 2800 LΘ to 10,000 LΘ.
M.Y. Rahimi Ardabili
doaj   +2 more sources

The period–luminosity relation of Mira variable stars [PDF]

Proceedings of the International Astronomical Union, 2012
AbstractWe use astrometry to measure the distances to Galactic Mira variable stars. Our purpose is to determine a precise period–luminosity relation (PLR). At present, we do not have a precise PLR for Galactic Mira stars because of the large uncertainties affecting their distance estimates. To reduce the uncertainties, we adopted the Very Long Baseline
Akiharu Nakagawa, Tomoharu Kurayama, Toshihiro Omodaka, Tatsuya Kamezaki, Yoshiro Nishida, Makoto Matsui   +5 more
openaire   +1 more source

The OGLE Collection of Variable Stars: Nearly 66,000 Mira Stars in the Milky Way

The Astrophysical Journal Supplement Series, 2022
Abstract We present a collection of 65,981 Mira-type variable stars found in the Optical Gravitational Lensing Experiment (OGLE) project database. Two-thirds of our sample (40,356 objects) are located in the Galactic bulge fields, whereas 25,625 stars are in the Galactic disk.
Patryk Iwanek, Igor Soszyński, Szymon Kozłowski, Radosław Poleski, Paweł Pietrukowicz, Jan Skowron, Marcin Wrona, Przemysław Mróz, Andrzej Udalski, Michał K. Szymański, Dorota M. Skowron, Krzysztof Ulaczyk, Mariusz Gromadzki, Krzysztof Rybicki, Milena Ratajczak   +14 more
openaire   +3 more sources

The first known Mira-type variable star in IC 1613 [PDF]

Astronomy & Astrophysics, 2001
5 pages, 5 figures, accepted in A& ...
Kurtev, R., Georgiev, L., Borissova, J., Li, W. D., Filippenko, A. V., Treffers, R. R.   +5 more
openaire   +2 more sources

Multiwavelength Studies of Mira Ceti-type Variable Stars [PDF]

Symposium - International Astronomical Union, 1999
Since 1994, observations of a sample of about 20 Mira Ceti-type and semiregular variables have been carried out in three spectral ranges: radio (H2O maser line λ = 1.35 cm), optical (spectroscopy and UBV photometry) and infrared (JHKLM photometry). Time series of the Hα emission intensity and H2O line flux, covering several periods of the stars, have ...
V.F. Esipov, M.I. Pashchenko, G.M. Rudnitskij, M.V. Kozin, E.E. Lekht, A.E. Nadjip, S.V. Fomin   +6 more
openaire   +1 more source

NLTE Synthetic Spectra of Mira-Type Variable Stars [PDF]

International Astronomical Union Colloquium, 1993
AbstractWe present NLTE radiative transfer in hydrodynamic models representative of Mira-type variable stars. Calculations were carried out with the PANDORA code of the Bowen models using a snapshot approximation.
Donald G. Luttermoser, George H. Bowen, Lee Anne Willson   +2 more
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Phase-dependent Spectroscopy of Mira Variable Stars

The Astronomical Journal, 2000
Spectroscopic measurements of Mira variable stars, as a function of phase, probe the stellar atmospheres and underlying pulsation mechanisms. For example, measuring variations in TiO, VO, and ZrO with phase can be used to help determine whether these molecular species are produced in an extended region above the layers where Balmer line emission occurs
Castelaz, Michael W., Luttermoser, Donald G., Caton, Daniel B., Piontek, Robert A.   +3 more
openaire   +3 more sources

OH/IR stars and the Period-Luminosity Relation of Mira variables

Proceedings of the International Astronomical Union, 2022
AbstractThe OH/IR stars evolving on the Asymptotic Giant Branch are large-amplitude variable stars with periods in the range of ~400 to 2500 days, significantly longer than those of the related Mira variables. We use preliminary results from a monitoring program of the 1612-MHz OH maser variations of a sample of > 70 OH/IR stars to study a possible ...
D. Engels, S. Etoka, F. Jiménez-Esteban, W. Herrmann, B. López-Martí   +4 more
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Simultaneous inference of periods and period-luminosity relations for Mira variable stars [PDF]

The Annals of Applied Statistics, 2021
The Period--Luminosity relation (PLR) of Mira variable stars is an important tool to determine astronomical distances. The common approach of estimating the PLR is a two-step procedure that first estimates the Mira periods and then runs a linear regression of magnitude on log period.
He, Shiyuan, Lin, Zhenfeng, Yuan, Wenlong, Macri, Lucas M., Huang, Jianhua Z.   +4 more
openaire   +2 more sources

Annual parallax measurement of a Mira variable star BX Cam with VERA [PDF]

Publications of the Astronomical Society of Japan, 2020
10 pages, 6 figures, 5 tables, Accepted by ...
Matsuno, Masako, Nakagawa, Akiharu, Morita, Atsushi, Kurayama, Tomoharu, Omodaka, Toshihiro, Nagayama, Takumi, Honma, Mareki, Shibata, Katsunori M, Ueno, Yuji, Jike, Takaaki, Tamura, Yoshiaki   +10 more
openaire   +3 more sources