[ITAL]BVI[/ITAL] Time-Series Data of the Galactic Globular Cluster NGC 3201. I. RR Lyrae Stars

2002 ◽  
Vol 124 (3) ◽  
pp. 1528-1554 ◽  
Author(s):  
A. M. Piersimoni ◽  
G. Bono ◽  
V. Ripepi
Keyword(s):  
Time Series ◽  
Globular Cluster ◽  
Time Series Data ◽  
Series Data ◽  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
Lyrae Stars

scholarly journals Blazhko effect in Cepheids and RR Lyrae stars

2013 ◽  
Vol 9 (S301) ◽  
pp. 241-248
Author(s):  
Róbert Szabó
Keyword(s):  
Time Series Data ◽  
Period Doubling ◽  
High Order ◽  
Series Data ◽  
Theoretical Point ◽  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
Starting Point ◽  
Blazhko Effect ◽  
Lyrae Stars

AbstractThe Blazhko effect is the conspicuous amplitude and phase modulation of the pulsation of RR Lyrae stars that was discovered in the early 20th century. The field of study of this mysterious modulation has recently been invigorated thanks to the space photometric missions providing long, uninterrupted, ultra-precise time-series data. In this paper I give a brief overview of the new observational findings related to the Blazhko effect, such as extreme modulations, irregular modulation cycles and additional periodicities. I argue that these findings together with dedicated ground-based efforts provide us now with a fairly complete picture and a good starting point to theoretical investigations. Indeed, new, unpredicted dynamical phenomena have been discovered in Blazhko RR Lyrae stars, such as period doubling, high-order resonances, three-mode pulsation and low-dimensional chaos. These led to the proposal of a new explanation to this century-old enigma, namely a high-order resonance between radial modes. Along these lines I present the latest efforts and advances from the theoretical point of view. Lastly, amplitude variations in Cepheids are discussed.

STRucture and Evolution of the GAlaxy (STREGA): The case of Pal 3

2019 ◽  
Vol 14 (S351) ◽  
pp. 478-481
Author(s):  
M. I. Moretti ◽  
I. Musella ◽  
M. Marconi ◽  
V. Ripepi ◽  
R. Molinaro
Keyword(s):  
Time Series ◽  
Globular Cluster ◽  
Variable Stars ◽  
Rr Lyrae Stars ◽  
North East ◽  
The North ◽  
Rr Lyrae ◽  
The Galaxy ◽  
Lyrae Stars ◽  
Candidate Variable

AbstractIn the context of the STRucture and Evolution of the GAlaxy survey, we describe the preliminary results obtained for the fields around the globular cluster Pal 3 (about 2.75 square degrees), by exploiting the obtained g, r, i time series photometry. The final aim is to use variable stars as tools to verify and study the presence of streams around Pal 3. We found 20 candidate variable stars of which 7 RR Lyrae stars possibly belonging to Pal 3, also at large distance from the center. The distribution of the candidate RR Lyrae seems to confirm a preferential distribution in the north-east direction, confirming previous results in literature.

scholarly journals Time Series CCD Photometry of the Globular Cluster M 53

2002 ◽  
Vol 185 ◽  
pp. 140-141
Author(s):  
Y.-B. Jeon ◽  
S.-L. Kim ◽  
H. Lee ◽  
M.G. Lee
Keyword(s):  
Time Series ◽  
Globular Cluster ◽  
Light Curves ◽  
Ccd Photometry ◽  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
Blue Straggler ◽  
Magnitude Diagram ◽  
Lyrae Stars

AbstractThrough time-series CCD photometry of the globular cluster M 53, we have discovered eight new SX Phoenicis type stars. All the new SX Phoenicis stars are located in the blue straggler star region in the color-magnitude diagram of M 53. In addition, we have obtained light curves for 45 known RR Lyrae stars.

scholarly journals A Century in Period Changes of the Variables in M15

1995 ◽  
Vol 155 ◽  
pp. 387-388
Author(s):  
Katalin Barlai ◽  
B. Szeidl
Keyword(s):  
Globular Cluster ◽  
Period Change ◽  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
Lyrae Stars ◽  
Linear Period

AbstractPeriod behaviour of 62 RR Lyrae stars in the M15 globular cluster has been investigated. About one half of the sample (30 stars) exhibited linear period change. The remaining 32 variables can be characterized by abrupt or erratic changes in their periods.

Double-Mode RR Lyrae Stars in the Globular Cluster M15

1995 ◽  
Vol 110 ◽  
pp. 1712 ◽  
Author(s):  
Patricia Purdue ◽  
N. A. Silbermann ◽  
Pamela Gay ◽  
Horace A. Smith
Keyword(s):  
Globular Cluster ◽  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
Lyrae Stars

The RR Lyrae stars in and around the LMC globular cluster NGC 2257

1985 ◽  
Vol 57 ◽  
pp. 287 ◽  
Author(s):  
J. M. Nemec ◽  
J. E. Hesser ◽  
P. P. Ugarte
Keyword(s):  
Globular Cluster ◽  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
Lyrae Stars

scholarly journals Detailed study of the Milky Way globular cluster Laevens 3

2019 ◽  
Vol 490 (2) ◽  
pp. 1498-1508
Author(s):  
Nicolas Longeard ◽  
Nicolas Martin ◽  
Rodrigo A Ibata ◽  
Michelle L M Collins ◽  
Benjamin P M Laevens ◽  
...  
Keyword(s):  
Globular Cluster ◽  
Globular Clusters ◽  
Milky Way ◽  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
Magnitude Diagram ◽  
Mass Segregation ◽  
Stellar Properties ◽  
Lyrae Stars ◽  
Gaia Dr2

ABSTRACT We present a photometric and spectroscopic study of the Milky Way satellite Laevens 3. Using MegaCam/Canada–France–Hawaii Telescope $g$ and $i$ photometry and Keck II/DEIMOS multi-object spectroscopy, we refine the structural and stellar properties of the system. The Laevens 3 colour–magnitude diagram shows that it is quite metal-poor, old ($13.0 \pm 1.0$ Gyr), and at a distance of $61.4 \pm 1.0$ kpc, partly based on two RR Lyrae stars. The system is faint ($M_V = -2.8^{+0.2}_{-0.3}$ mag) and compact ($r_h = 11.4 \pm 1.0$ pc). From the spectroscopy, we constrain the systemic metallicity (${\rm [Fe/H]}_\mathrm{spectro} = -1.8 \pm 0.1$ dex) but the metallicity and velocity dispersions are both unresolved. Using Gaia DR2, we infer a mean proper motion of $(\mu _\alpha ^*,\mu _\delta)=(0.51 \pm 0.28,-0.83 \pm 0.27)$ mas yr−1, which, combined with the system’s radial velocity ($\langle v_r\rangle = -70.2 \pm 0.5 {\rm \, km \,\, s^{-1}}$), translates into a halo orbit with a pericenter and apocenter of $40.7 ^{+5.6}_{-14.7}$ and $85.6^{+17.2}_{-5.9}$ kpc, respectively. Overall, Laevens 3 shares the typical properties of the Milky Way’s outer halo globular clusters. Furthermore, we find that this system shows signs of mass segregation that strengthens our conclusion that Laevens 3 is a globular cluster.

scholarly journals OVERTONE AND MULTI-MODE RR LYRAE STARS IN THE GLOBULAR CLUSTER M3

2015 ◽  
Vol 219 (2) ◽  
pp. 25 ◽  
Author(s):  
J. Jurcsik ◽  
P. Smitola ◽  
G. Hajdu ◽  
Á. Sódor ◽  
J. Nuspl ◽  
...  
Keyword(s):  
Globular Cluster ◽  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
Lyrae Stars ◽  
Multi Mode

scholarly journals ON THE DISTANCE OF THE GLOBULAR CLUSTER M4 (NGC 6121) USING RR LYRAE STARS. II. MID-INFRARED PERIOD–LUMINOSITY RELATIONS

2015 ◽  
Vol 808 (1) ◽  
pp. 11 ◽  
Author(s):  
J. R. Neeley ◽  
M. Marengo ◽  
G. Bono ◽  
V. F. Braga ◽  
M. Dall’Ora ◽  
...  
Keyword(s):  
Globular Cluster ◽  
Rr Lyrae Stars ◽  
Mid Infrared ◽  
Rr Lyrae ◽  
Lyrae Stars
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