RR Lyrae mode switching in globular cluster M 68 (NGC 4590)

Noé Kains; Daniel Martyn Bramich; A. Arellano Ferro; Roberto Jose Figuera Jaimes

doi:10.1051/0004-6361/201526819

RR Lyrae mode switching in globular cluster M 68 (NGC 4590)

Noé Kains, Daniel Martyn Bramich, A. Arellano Ferro, Roberto Jose Figuera Jaimes

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

We build on our detailed analysis of time-series observations of the globular cluster M 68 to investigate the irregular pulsational behaviour of four of the RR Lyrae stars in this cluster. M 68 is one of only two globular clusters in which mode switching of RR Lyrae stars has previously been reported. We discuss one additional case, as well as a case of irregular behaviour, and we briefly revisit the two previously reported cases with a homogeneous analysis. We find that in 2013, V45 was pulsating in the first-overtone mode alone, despite being previously reported as a double-mode (fundamental and first overtone) pulsator in 1994, and that the amplitude of the fundamental mode in V7 is increasing with time. We also suggest that V21 might not have switched pulsation modes as previously reported, although the first overtone seems to be becoming less dominant. Finally, our analysis of available archival data confirms that V33 lost a pulsation mode between 1950 and 1986.

Original language	English
Number of pages	6
Journal	Astronomy & Astrophysics
Volume	582
DOIs	https://doi.org/10.1051/0004-6361/201526819
Publication status	Published - 22 Oct 2015

Keywords

Stars: variables: RR Lyrae
Globular clusters: individual: M 68 (NGC 4590)

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10.1051/0004-6361/201526819

Jaimes_2015_A&A_RR
© ESO, 2015. Reproduced with permission from Astronomy & Astrophysics, © ESO. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at: http://dx.doi.org/10.1051/0004-6361/201526819
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@article{dba11baa340c41ebbf40aee5e9b04c8d,

title = "RR Lyrae mode switching in globular cluster M 68 (NGC 4590)",

abstract = "We build on our detailed analysis of time-series observations of the globular cluster M 68 to investigate the irregular pulsational behaviour of four of the RR Lyrae stars in this cluster. M 68 is one of only two globular clusters in which mode switching of RR Lyrae stars has previously been reported. We discuss one additional case, as well as a case of irregular behaviour, and we briefly revisit the two previously reported cases with a homogeneous analysis. We find that in 2013, V45 was pulsating in the first-overtone mode alone, despite being previously reported as a double-mode (fundamental and first overtone) pulsator in 1994, and that the amplitude of the fundamental mode in V7 is increasing with time. We also suggest that V21 might not have switched pulsation modes as previously reported, although the first overtone seems to be becoming less dominant. Finally, our analysis of available archival data confirms that V33 lost a pulsation mode between 1950 and 1986.",

keywords = "Stars: variables: RR Lyrae, Globular clusters: individual: M 68 (NGC 4590)",

author = "No{\'e} Kains and Bramich, {Daniel Martyn} and {Arellano Ferro}, A. and {Figuera Jaimes}, {Roberto Jose}",

note = "D.M.B. acknowledges NPRP grant # X-019-1-006 from the Qatar National Research Fund (a member of Qatar Foundation). A.A.F. acknowledges the support of DGAPA-UNAM through project IN106615-17. ",

year = "2015",

month = oct,

day = "22",

doi = "10.1051/0004-6361/201526819",

language = "English",

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TY - JOUR

T1 - RR Lyrae mode switching in globular cluster M 68 (NGC 4590)

AU - Kains, Noé

AU - Bramich, Daniel Martyn

AU - Arellano Ferro, A.

AU - Figuera Jaimes, Roberto Jose

N1 - D.M.B. acknowledges NPRP grant # X-019-1-006 from the Qatar National Research Fund (a member of Qatar Foundation). A.A.F. acknowledges the support of DGAPA-UNAM through project IN106615-17.

PY - 2015/10/22

Y1 - 2015/10/22

N2 - We build on our detailed analysis of time-series observations of the globular cluster M 68 to investigate the irregular pulsational behaviour of four of the RR Lyrae stars in this cluster. M 68 is one of only two globular clusters in which mode switching of RR Lyrae stars has previously been reported. We discuss one additional case, as well as a case of irregular behaviour, and we briefly revisit the two previously reported cases with a homogeneous analysis. We find that in 2013, V45 was pulsating in the first-overtone mode alone, despite being previously reported as a double-mode (fundamental and first overtone) pulsator in 1994, and that the amplitude of the fundamental mode in V7 is increasing with time. We also suggest that V21 might not have switched pulsation modes as previously reported, although the first overtone seems to be becoming less dominant. Finally, our analysis of available archival data confirms that V33 lost a pulsation mode between 1950 and 1986.

AB - We build on our detailed analysis of time-series observations of the globular cluster M 68 to investigate the irregular pulsational behaviour of four of the RR Lyrae stars in this cluster. M 68 is one of only two globular clusters in which mode switching of RR Lyrae stars has previously been reported. We discuss one additional case, as well as a case of irregular behaviour, and we briefly revisit the two previously reported cases with a homogeneous analysis. We find that in 2013, V45 was pulsating in the first-overtone mode alone, despite being previously reported as a double-mode (fundamental and first overtone) pulsator in 1994, and that the amplitude of the fundamental mode in V7 is increasing with time. We also suggest that V21 might not have switched pulsation modes as previously reported, although the first overtone seems to be becoming less dominant. Finally, our analysis of available archival data confirms that V33 lost a pulsation mode between 1950 and 1986.

KW - Stars: variables: RR Lyrae

KW - Globular clusters: individual: M 68 (NGC 4590)

U2 - 10.1051/0004-6361/201526819

DO - 10.1051/0004-6361/201526819

M3 - Article

AN - SCOPUS:84945918477

SN - 0004-6361

VL - 582

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

ER -

RR Lyrae mode switching in globular cluster M 68 (NGC 4590)

Abstract

Keywords

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