Variable stars classification based on photometric data from the "Pi of the Sky" project

2009 ◽  
Author(s):  
A. Majczyna ◽  
M. Nalezyty ◽  
M. Siudek ◽  
K. Malek ◽  
A. Barnacka ◽  
...  
Keyword(s):  
Variable Stars ◽  
Photometric Data ◽  
Stars Classification

scholarly journals New results on OGLE Cepheids and PL relations in the LMC and SMC

2004 ◽  
Vol 193 ◽  
pp. 75-82
Author(s):  
A. Udalski
Keyword(s):  
Gravitational Lensing ◽  
Variable Stars ◽  
Magellanic Clouds ◽  
Photometric Data ◽  
Second Phase ◽  
Internet Archive ◽  
Pulsating Stars ◽  
Third Phase ◽  
Pulsating Variable Stars ◽  
Star Field

AbstractWe present results of the search for pulsating variable stars in the Magellanic Cloud fields covering central parts of these galaxies. The data were collected during the second phase of the Optical Gravitational Lensing Experiment survey (OGLE-II) from 1997 to 2000. In total, several thousand pulsating stars (Cepheids, RR Lyr) were found in both Magellanic Clouds. The photometric data of all objects are available to the astronomical community from the OGLE Internet archive. We present basic properties of pulsating stars in the Magellanic Clouds including Period–Luminosity relations for Cepheids. We also discuss observational prospects for the pulsating star field in the ongoing third phase of the OGLE project (OGLE-III) which started in 2001.

scholarly journals The Carina Dwarf Galaxy Variable Star Population

2002 ◽  
Vol 185 ◽  
pp. 134-135
Author(s):  
V. Ripepi ◽  
M. Dall’Ora ◽  
L. Pulone ◽  
M. Castellani ◽  
C. Corsi ◽  
...  
Keyword(s):  
Variable Star ◽  
Dwarf Galaxy ◽  
Variable Stars ◽  
Photometric Data ◽  
Wide Field ◽  
Preliminary Results

AbstractWe present some preliminary results based on new observations of the variable stars belonging to the Carina Dwarf Galaxy (DG). Photometric data were collected with the two wide field imagers available at ESO ([email protected].) and CTIO (4m prime focus).

scholarly journals Asteroseismology from Dome A, Antarctica

2013 ◽  
Vol 9 (S301) ◽  
pp. 409-410
Author(s):  
J. N. Fu ◽  
W. K. Zong ◽  
Y. Yang ◽  
A. Moore ◽  
M. C. B. Ashley ◽  
...  
Keyword(s):  
Time Series ◽  
Variable Stars ◽  
Photometric Data ◽  
Dome A ◽  
Pulsating Variable Stars ◽  
Scientific Potential

AbstractGattini and CSTAR have been installed at Dome A, Antarctica, which provide time-series photometric data for a large number of pulsating variable stars. We present the study for several variable stars with the data collected with the two facilities in 2009 to demonstrate the scientific potential of observations from Dome A for asteroseismology.

scholarly journals Direct detection of multiple periods in variable stars

2004 ◽  
Vol 193 ◽  
pp. 283-286 ◽  
Author(s):  
C. Schoenaers ◽  
J. Cuypers
Keyword(s):  
Observational Data ◽  
Direct Detection ◽  
Variable Stars ◽  
Photometric Data ◽  
Data Sets ◽  
Large Set ◽  
Significant Frequency ◽  
Observational Material

AbstractIn some observational data sets of variable stars, multiperiodicity was not always recognized as such, and only became apparent when other observational material became available. In other cases, consecutive prewhitening starting with the obviously most significant frequency could lead to a wrong multifrequency solution. A few examples illustrating this are given. Searching directly for a multifrequency solution can often remedy this. Examples are given and the results of applying this technique to a large set of Hipparcos photometric data are communicated. An overview of the multiple periodicities found in β Cephei stars and SPB stars is reported in detail.

Observational Properties of Miras in the KELT Survey

2018 ◽  
Vol 14 (S343) ◽  
pp. 349-350
Author(s):  
R. A. Arnold ◽  
M. Virginia McSwain ◽  
Joshua Pepper ◽  
Keivan G. Stassun ◽  
Keyword(s):  
Theoretical Work ◽  
Variable Stars ◽  
Photometric Data ◽  
Asymptotic Giant Branch ◽  
Mode Stability ◽  
Type Variable

AbstractWe present a catalog of the observed properties of Mira-type variable stars detected with the Kilodegree Extremely Little Telescope (KELT). Asymptotic giant branch (AGB) candidates were identified in KELT using a combination of photometric data from KELT and 2MASS colors. Of the 4 million objects with KELT photometry, 3332 Mira-like variables were identified. Here, we present their observed periods and luminosities which will place important constraints on future theoretical work on the effect convection has on pulsation periods and mode stability.

Monitoring Period Variations of Variable Stars using Precise Photometric Surveys

2017 ◽  
Vol 14 (S339) ◽  
pp. 110-113
Author(s):  
Z. Mikulášek ◽  
M. Zejda ◽  
S. Hümmerich ◽  
J. Krtička ◽  
K. Bernhard ◽  
...  
Keyword(s):  
Variable Stars ◽  
Period Change ◽  
Photometric Data ◽  
Universal Method ◽  
Rotational Period ◽  
Monitoring Period ◽  
Chemically Peculiar ◽  
Period Variations ◽  
Long Term Changes

AbstractThe period variations of rotating, pulsating and eclipsing variable stars bear valuable astrophysical information about the presence of companions, evolutionary effects, and the inner structure of the stars. This talk described a universal method for de-trending and re-scaling precise photometric data (Kepler, MOST, CoRoT, OGLE, …) appropriate for period-change diagnostics of periodic variables. We demonstrated the potential of the method by analysing the period variability of one of the newly-identified Kepler magnetic chemically-peculiar (mCP) stars. We showed that, surprisingly, our target star displays near-sinusoidal changes in its observed light-variations, with a period of 2.85(6) years, which is apparently the result of the presence of a nearby stellar companion. The expected long-term changes of the rotational period, as have been observed in several mCP stars, have not been identified among the sample of Kepler mCP stars.

scholarly journals Future of the General Catalogue of Variable Stars from the Experience of Recent Name-lists

2021 ◽  
Vol 30 (1) ◽  
pp. 122-126
Author(s):  
Nikolay N. Samus ◽  
Elena V. Kazarovets ◽  
Olga V. Durlevich ◽  
Natalia N. Kireeva ◽  
Elena N. Pastukhova ◽  
...  
Keyword(s):  
Globular Clusters ◽  
Variable Star ◽  
Star Clusters ◽  
Positional Information ◽  
Variable Stars ◽  
Photometric Data ◽  
Star Data ◽  
General Catalogue ◽  
The Future ◽  
History Of

Abstract We briefly outline the history of the General Catalogue of Variable Stars (GCVS) and the New Catalogue of Suspected Variable Stars (NSV catalogue). Recently, we have completed a revision of the NSV catalogue. Positional information was checked for all its stars and, in many cases, new photometric data were added. As a result, one third of all NSV stars have been transferred to the GCVS. Having determined equatorial coordinates for variable stars in globular star clusters, we began to add them to the GCVS. Two Name-lists published so far contain more than 1700 variable stars in 36 globular clusters; an additional Name-list (about 900 variable stars in 27 globular clusters) will be published before the end of 2021. We discuss problem cases in the literature and in the Catalogue of Variable Stars in Galactic Globular Clusters revealed during our preparation of the Name-lists. The future of traditional catalogues of variable stars (GCVS; AAVSO Variable-star Data Index VSX) is discussed.

scholarly journals Tycho Photometry: Calibration and First Results

1993 ◽  
Vol 136 ◽  
pp. 346-351
Author(s):  
V. Großmann
Keyword(s):  
Broad Band ◽  
Calibration Procedure ◽  
Variable Stars ◽  
Photometric Data ◽  
Galactic Latitude ◽  
First Results

AbstractThe star mappers on board the ESA Hipparcos satellite will be used as one part of the Tycho project to obtain photometric data of a quasi B and V band magnitude for the 500,000 brightest stars and one broad-band magnitude T for a further 500,000 stars. Approximately 150 million single observations of these stars will be collected during a 4.5-year mission of the satellite.The accuracy of the photometric data gained is expected to be 0.03 mag on the average at B = 10.5 mag for non-variable stars. We shall get T magnitudes for stars down to a limiting magnitude of about B = 12 mag depending on the galactic latitude. We will give an overview of the calibration procedure and present some of the first results.

scholarly journals Predictions on the Number of Variable Stars for the GAIA Space Mission and for Surveys such as the Ground-Based International Liquid Mirror Telescope

2000 ◽  
Vol 176 ◽  
pp. 71-72 ◽  
Author(s):  
Laurent Eyer ◽  
Jan Cuypers
Keyword(s):  
Time Series ◽  
Space Mission ◽  
Variable Stars ◽  
Photometric Data ◽  
Huge Number ◽  
Future Space ◽  
Survey Instruments ◽  
Mirror Telescope ◽  
Stars Survey

AbstractFuture space and ground-based survey programmes will produce an impressive amount of photometric data. The GAIA space mission will map the complete sky down to V = 20m, and produce time series for about 1 billion stars. Survey instruments such as the International Liquid Mirror Telescope will observe slices of the sky down to V = 23m. In both experiments, the opportunity exists to discover a huge number of variable stars. Predictions of the expected total number of variable stars and the number of variables in specific subgroups are given.

scholarly journals On a New Technique for Discovering Variable Stars

2003 ◽  
Vol 12 (4) ◽  
Author(s):  
A. V. Mironov ◽  
A. I. Zakharov ◽  
F. N. Nikolaev
Keyword(s):  
Numerical Experiments ◽  
Correlation Coefficients ◽  
Variable Stars ◽  
Photometric Data ◽  
New Technique ◽  
A New Technique

AbstractA technique for discovering variable stars based on the calculation of the correlation coefficients is proposed. Applications of the technique are shown on the results of numerical experiments and on the Hipparcos photometric data.

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