2012A&A...540A..68C


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.28CET14:22:58

2012A&A...540A..68C - Astronomy and Astrophysics, volume 540A, 68-68 (2012/4-1)

Detection of multiple modes in a new double-mode RR Lyrae star.

CHADID M.

Abstract (from CDS):

We present the first long-time coverage of high precision and uninterrupted light curve of a new double-mode RRLyrae star allowing the determination of accurate Fourier components and the estimatation of fundamental parameters. We used high-precision space data of a new star CoRoT ID 0101368812, obtained by the satellite CoRoT, towards an understanding of double-mode RRLyrae stars and the stellar evolution & pulsation. The CoRoT data were corrected using jump and trend filtering codes and we applied the period-finding technique Period04. Non-linearly coupled frequencies f0=2.049d–1 (P0=0.488d) and f1=2.750d–1 (P1=0.364d) are found up to the tenth order with a period ratio P1/P0 of 0.745 and an amplitude ratio A1/A0 of 2.705. The frequencies f0 and f1 are interpreted as radial modes. The first overtone is the dominant pulsation mode. A large number of 22 linear combinations of these modes are also detected. An unprecedented number of additional frequencies and their linear combinations, are detected in addition to the fundamental radial mode, the first overtone radial mode, and their linear combinations. The most surprising result is the unexpected period ratios 0.458, 0.285, and 0.217 of additional frequencies to fundamental radial mode, which imply a possible simultaneous excitation of fundamental, first, and third overtone radial modes, in addition to non-radial modes. The newly discovered CoRoT ID 0101368812 is the first member of a new class of RR Lyrae stars. These results give us an opportunity to test the theoretical models of mode saturation and growth in RRd pulsators.

Abstract Copyright:

Journal keyword(s): hydrodynamics - shock waves - techniques: photometric - stars: atmospheres - stars: variables: RR Lyrae - stars: Population II

CDS comments: In ref list Olech & Moskalik 2009, A&A, 494, 170 is a misprint for Olech & Moskalik 2009, A&A, 494, L17

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5505 1
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14558 1
3 V* AQ Leo RR* 11 23 55.2750743728 +10 18 59.080007685           A1 69 0
4 V* CU Com RR* 12 24 46.6093358310 +22 24 28.243102858     13.26     ~ 26 0
5 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 2955 0
6 Cl* NGC 5139 NJL 6 RR* 13 27 30.1260242195 -47 28 05.695517390 15.263 15.242 14.753 14.621 14.244 ~ 29 0
7 Cl* NGC 5139 B V105 RR* 13 27 46.0375856383 -47 32 44.264488061 15.204 14.899 14.746 14.364 14.166 ~ 26 0
8 V* BS Com RR* 13 34 39.2101577233 +24 16 38.025273010   12.64 12.69     kA2.5hA8.5 20 0
9 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11259 0
10 2MASS J19281363+0040423 RR* 19 28 13.632 +00 40 42.34     15.864     ~ 9 0

    Equat.    Gal    SGal    Ecl

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2020.02.28-14:22:58

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