J/AJ/144/39 Galactic RRab stars from the GEOS RR Lyr Survey (Le Borgne+, 2012)
The all-sky GEOS RR Lyr survey with the TAROT telescopes:
analysis of the Blazhko effect.
Le Borgne J.-F., Klotz A., Poretti E., Boer M., Butterworth N., Dumont M.,
Dvorak S., Hambsch F.-J., Hund F., Kugel F., Vandenbroere J., Vilalta J.M.
<Astron. J., 144, 39 (2012)>
=2012AJ....144...39L 2012AJ....144...39L
ADC_Keywords: Stars, variable ; Photometry
Keywords: astronomical databases: miscellaneous - stars: evolution -
stars: horizontal-branch - stars: variables: RR Lyrae
Abstract:
We used the GEOS database to study the Blazhko effect of galactic RRab
stars. The database is continuously enriched by maxima supplied by
amateur astronomers and by a dedicated survey by means of the two
TAROT robotic telescopes. The same value of the Blazhko period is
observed at different values of the pulsation periods and different
values of the Blazhko periods are observed at the same value of the
pulsation period. There are clues suggesting that the Blazhko effect
is changing from one cycle to the next. The secular changes in the
pulsation and Blazhko periods of Z CVn are anticorrelated. The
diagrams of magnitudes against phases of the maxima clearly show that
the light curves of Blazhko variables can be explained as modulated
signals, both in amplitude and in frequency. The closed curves
describing the Blazhko cycles in such diagrams have different shapes,
reflecting the phase shifts between the epochs of the brightest
maximum and the maximum O-C. Our sample shows that both clockwise
and counterclockwise directions are possible for similar shapes. The
improved observational knowledge of the Blazhko effect, in addition to
some peculiarities of the light curves, has yet to be explained by a
satisfactory physical mechanism.
Description:
The Groupe Europeen d Observations Stellaires (GEOS) RR Lyr Database
(http://rr-lyr.ast.obs-mip.fr/dbrr/) was started in 2000 and now
contains 61000 maxima of 3600 stars. The main contribution to the GEOS
RR Lyr database comes from the GEOS RR Lyr Survey and particularly
from the observations of the two 25cm automated robotic telescopes
Telescope a Action Rapide pour les Objets Transitoires (TAROT) located
in France (Calern Observatory) and in Chile (La Silla Observatory).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 83 32 *RRab stars showing blazhko effect observed with TAROTs
table2.dat 48 104 RRab stars showing a known blazhko effect and not
discussed in this paper
--------------------------------------------------------------------------------
Note on table1.dat: Table1 corrected at CDS to remove the duplicated line 5.
--------------------------------------------------------------------------------
See also:
B/corot : CoRoT observation log Release 13 (CoRoT, 2009-2013)
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)
J/A+A/549/A101 : Known Galactic field Blazhko stars (Skarka, 2013)
J/MNRAS/415/1577 : CoRoT 105288363 Blazhko modulation (Guggenberger+, 2011)
J/A+A/520/A108 : CoRoT 101128793 light curves (Poretti+, 2010)
J/A+A/510/A39 : CoRoT light curves of V1127 Aql (Chadid+, 2010)
J/AJ/133/1470 : TAROT suspected variable star catalog (Damerdji+, 2007)
J/A+A/476/307 : Period variations in galactic RRab stars (Le Borgne+, 2007)
J/MNRAS/368/1757 : Catalogue of RR Lyrae from NSVS (Wils+, 2006)
J/ApJ/651/197 : OGLE RR Lyr in Galactic Bulge (Collinge+, 2006)
J/A+A/430/1049 : RR Gem BV(RI)c differential photometry (Jurcsik+, 2005)
J/A+A/371/986 : Monoperiodic pulsating stars in OGLE (Poretti, 2001)
J/A+A/322/817 : Theoretical RRab light curves properties (Feuchtinger+ 1997)
http://rr-lyr.ast.obs-mip.fr/dbrr/ : The GEOS database
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- Stat Status: I=stars with known Blazhko effect,
or II=new Blazhko RR Lyr stars
4- 9 A6 --- Star Star name
11- 16 F6.4 d Per [0.3687/0.6539] Pulsational period
18- 24 F7.3 d PB1 [7.23/533]? Known Blazhko period
26 A1 --- r_PB1 Reference for PB1 (1)
28- 30 I3 --- Nmax [9/136] Number of maxima collected
32- 35 F4.2 mag Amp [0.8/1.35]? Amplitude
37- 43 F7.3 d PB2 [7.209/532.481] New Blazhko period
45 A1 --- u_PB2 Uncertainty flag on PB2
47- 51 F5.3 d A(O-C) [0.004/0.063] Full amplitude of the O-C
(observed minus calculated time of maximum
brightness Tmax) value
53- 54 A2 --- l_A(Vmax) [≥] Upper limit on A(Vmax)
56- 59 F4.2 mag A(Vmax) [0.1/0.75]? Full amplitude of the Vmax
(magnitude at maximum) value
61- 68 F8.3 d Ep(O-C) Epoch (HJD-2450000) of the O-C (observed
minus calculated Tmax) value
70- 77 F8.3 d Ep(Vmax) [152.137/5609.961]? Epoch (HJD-2450000) of
the Vmax (magnitude at maximum) value
79- 83 F5.2 d Phase ? Phase shift ΔΦ(PB) between the
epochs of the brightest maximum and the
maximum O-C (expressed as a function of the
Blazhko period)
--------------------------------------------------------------------------------
Note (1): Reference as follows:
1 = Kholopov (1988, Cat. II/139, obsoleted by Cat. B/gcvs);
2 = Wils & Sodor (2005IBVS.5655....1W 2005IBVS.5655....1W);
3 = Wils et al. (2006, Cat. J/MNRAS/368/1757);
4 = Le Borgne et al. (2007, Cat. J/A+A/476/307);
5 = Kanyo (1966IBVS..146....1K 1966IBVS..146....1K);
6 = Jurcsik et al. (2005, Cat. J/A+A/430/1049);
7 = Hurta et al. (2008AJ....135..957H 2008AJ....135..957H).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- Star Star name
18 A1 --- f_Star Flag on Star (1)
20- 24 F5.3 d Per Pulsational period
26- 27 A2 --- l_PB1 Lower limit on PB1
29- 34 F6.2 d PB1 Known Blazhko period
36 A1 --- u_PB1 Uncertainty flag on PB1
38 A1 --- r_PB1 [a] Origin of PB1 (2)
40- 41 I2 d PB2 ? Second value for the known Blazhko period
43 A1 --- r_PB2 [b] Origin of PB2 (2)
45- 48 A4 --- Ref Reference (3)
--------------------------------------------------------------------------------
Note (1): New names are provided by the General Catalogue of Variable Stars
(Cat. B/gcvs) for the newly discovered RRab Blazhko variables. Other names:
a = V1124 Her is NSV 8170 (Jurcsik et al., 2005AcA....55..303J 2005AcA....55..303J);
b = PQ Lup is NSV 7330 (Wils & Sodor, 2005IBVS.5655....1W 2005IBVS.5655....1W);
c = DZ Oct is NSV 4350 (Wils & Sodor, 2005IBVS.5655....1W 2005IBVS.5655....1W);
d = CS Phe is NSV 420 (Wils & Sodor, 2005IBVS.5655....1W 2005IBVS.5655....1W);
e = AL Pic is NSV 1700 (Wils & Sodor, 2005IBVS.5655....1W 2005IBVS.5655....1W);
f = V1280 Ori is NSV 2724 (Wils et al., 2006, Cat. J/MNRAS/368/1757);
g = NS UMa is NSV 4034 (Wils et al., 2006, Cat. J/MNRAS/368/1757);
Note (2): Flag on Blazhko period as follows:
a = Blazhko period from Lee & Schmidt (2001PASP..113..835L 2001PASP..113..835L);
b = Blazhko period from Wils et al. (2006, Cat. J/MNRAS/368/1757);
Note (3): Reference as follows:
1 = Smith (1995obas.book.....S 1995obas.book.....S);
2 = Wils & Sodor (2005IBVS.5655....1W 2005IBVS.5655....1W);
3 = Sodor & Jurcsik (2005IBVS.5641....1S 2005IBVS.5641....1S);
4 = Jurcsik et al. (2005AcA....55..303J 2005AcA....55..303J);
5 = Wils et al. (2006, Cat. J/MNRAS/368/1757);
6 = Jurcsik et al. (2009MNRAS.400.1006J 2009MNRAS.400.1006J);
7 = Szabo et al. (2009, Stellar pulsation: challenges for theory and
observation (AIP Conf. Proc. 1170), ed. J. A. Guzik & P. A. Bradley
(Melville, NY: AIP), 273);
8 = Lee & Schmidt (2001PASP..113..835L 2001PASP..113..835L);
9 = Benko et al. (2010MNRAS.409.1585B 2010MNRAS.409.1585B);
10 = Guggenberger et al. (2012MNRAS.424..649G 2012MNRAS.424..649G).
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Sylvain Guehenneux [CDS] 24-Sep-2013