An extensive photometric study of the Blazhko RR Lyrae star MW Lyr - II. Changes in the physical parameters

J. Jurcsik, Á Sódor, B. Szeidl, Z. Kolláth, H. A. Smith, Z. Hurta, M. Váradi, A. Henden, I. Dékány, I. Nagy, K. Posztobányi, A. Szing, K. Vida, N. Vityi

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The analysis of the multicolour photometric observations of MW Lyr, a large modulation amplitude Blazhko variable, shows for the first time how the mean global physical parameters vary during the Blazhko cycle. About 1-2 per cent changes in the mean radius, luminosity and surface effective temperature are detected. The mean radius and temperature changes are in good accordance with pulsation model results, which show that these parameters do indeed vary within this order of magnitude if the amplitude of the pulsation changes significantly. We interpret the phase modulation of the pulsation to be a consequence of period changes. Its magnitude corresponds exactly what one expects from the detected changes of the mean radius assuming that the pulsation constant remains the same during the modulation. Our results indicate that during the modulation the pulsation remains purely radial, and the underlying mechanism is most probably a periodic perturbation of the stellar luminosity with the modulation period.

Original languageEnglish
Pages (from-to)1553-1562
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume393
Issue number4
DOIs
Publication statusPublished - Mar 2009

Fingerprint

stars
modulation
radii
temperature
perturbation
stellar luminosity
phase modulation
luminosity
cycles
parameter
analysis

Keywords

  • Methods: data analysis
  • Stars: horizontal branch
  • Stars: individual: MW Lyr
  • Stars: oscillations
  • Stars: variables: other
  • Techniques: photometric

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

An extensive photometric study of the Blazhko RR Lyrae star MW Lyr - II. Changes in the physical parameters. / Jurcsik, J.; Sódor, Á; Szeidl, B.; Kolláth, Z.; Smith, H. A.; Hurta, Z.; Váradi, M.; Henden, A.; Dékány, I.; Nagy, I.; Posztobányi, K.; Szing, A.; Vida, K.; Vityi, N.

In: Monthly Notices of the Royal Astronomical Society, Vol. 393, No. 4, 03.2009, p. 1553-1562.

Research output: Contribution to journalArticle

Jurcsik, J. ; Sódor, Á ; Szeidl, B. ; Kolláth, Z. ; Smith, H. A. ; Hurta, Z. ; Váradi, M. ; Henden, A. ; Dékány, I. ; Nagy, I. ; Posztobányi, K. ; Szing, A. ; Vida, K. ; Vityi, N. / An extensive photometric study of the Blazhko RR Lyrae star MW Lyr - II. Changes in the physical parameters. In: Monthly Notices of the Royal Astronomical Society. 2009 ; Vol. 393, No. 4. pp. 1553-1562.
@article{40d3ab6e5abc4c57b8d0a4a73e0fbb51,
title = "An extensive photometric study of the Blazhko RR Lyrae star MW Lyr - II. Changes in the physical parameters",
abstract = "The analysis of the multicolour photometric observations of MW Lyr, a large modulation amplitude Blazhko variable, shows for the first time how the mean global physical parameters vary during the Blazhko cycle. About 1-2 per cent changes in the mean radius, luminosity and surface effective temperature are detected. The mean radius and temperature changes are in good accordance with pulsation model results, which show that these parameters do indeed vary within this order of magnitude if the amplitude of the pulsation changes significantly. We interpret the phase modulation of the pulsation to be a consequence of period changes. Its magnitude corresponds exactly what one expects from the detected changes of the mean radius assuming that the pulsation constant remains the same during the modulation. Our results indicate that during the modulation the pulsation remains purely radial, and the underlying mechanism is most probably a periodic perturbation of the stellar luminosity with the modulation period.",
keywords = "Methods: data analysis, Stars: horizontal branch, Stars: individual: MW Lyr, Stars: oscillations, Stars: variables: other, Techniques: photometric",
author = "J. Jurcsik and {\'A} S{\'o}dor and B. Szeidl and Z. Koll{\'a}th and Smith, {H. A.} and Z. Hurta and M. V{\'a}radi and A. Henden and I. D{\'e}k{\'a}ny and I. Nagy and K. Posztob{\'a}nyi and A. Szing and K. Vida and N. Vityi",
year = "2009",
month = "3",
doi = "10.1111/j.1365-2966.2008.14261.x",
language = "English",
volume = "393",
pages = "1553--1562",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "4",

}

TY - JOUR

T1 - An extensive photometric study of the Blazhko RR Lyrae star MW Lyr - II. Changes in the physical parameters

AU - Jurcsik, J.

AU - Sódor, Á

AU - Szeidl, B.

AU - Kolláth, Z.

AU - Smith, H. A.

AU - Hurta, Z.

AU - Váradi, M.

AU - Henden, A.

AU - Dékány, I.

AU - Nagy, I.

AU - Posztobányi, K.

AU - Szing, A.

AU - Vida, K.

AU - Vityi, N.

PY - 2009/3

Y1 - 2009/3

N2 - The analysis of the multicolour photometric observations of MW Lyr, a large modulation amplitude Blazhko variable, shows for the first time how the mean global physical parameters vary during the Blazhko cycle. About 1-2 per cent changes in the mean radius, luminosity and surface effective temperature are detected. The mean radius and temperature changes are in good accordance with pulsation model results, which show that these parameters do indeed vary within this order of magnitude if the amplitude of the pulsation changes significantly. We interpret the phase modulation of the pulsation to be a consequence of period changes. Its magnitude corresponds exactly what one expects from the detected changes of the mean radius assuming that the pulsation constant remains the same during the modulation. Our results indicate that during the modulation the pulsation remains purely radial, and the underlying mechanism is most probably a periodic perturbation of the stellar luminosity with the modulation period.

AB - The analysis of the multicolour photometric observations of MW Lyr, a large modulation amplitude Blazhko variable, shows for the first time how the mean global physical parameters vary during the Blazhko cycle. About 1-2 per cent changes in the mean radius, luminosity and surface effective temperature are detected. The mean radius and temperature changes are in good accordance with pulsation model results, which show that these parameters do indeed vary within this order of magnitude if the amplitude of the pulsation changes significantly. We interpret the phase modulation of the pulsation to be a consequence of period changes. Its magnitude corresponds exactly what one expects from the detected changes of the mean radius assuming that the pulsation constant remains the same during the modulation. Our results indicate that during the modulation the pulsation remains purely radial, and the underlying mechanism is most probably a periodic perturbation of the stellar luminosity with the modulation period.

KW - Methods: data analysis

KW - Stars: horizontal branch

KW - Stars: individual: MW Lyr

KW - Stars: oscillations

KW - Stars: variables: other

KW - Techniques: photometric

UR - http://www.scopus.com/inward/record.url?scp=61349203464&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=61349203464&partnerID=8YFLogxK

U2 - 10.1111/j.1365-2966.2008.14261.x

DO - 10.1111/j.1365-2966.2008.14261.x

M3 - Article

AN - SCOPUS:61349203464

VL - 393

SP - 1553

EP - 1562

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 4

ER -