Pulsating stars in binary systems: a review

Murphy, Simon J.

doi:10.48550/arxiv.1811.12659

Cited by 11 publications

(12 citation statements)

References 107 publications

(137 reference statements)

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“…These constraints are very useful for asteroseismical studies of pulsating stars in binaries. Various types of pulsating stars are known as members of binary systems (see the review by Murphy 2018). We placed V404 Lyr (KIC 3228863, Gaia DR2 2051369705923204224) on our spectroscopic observation program for eclipsing binaries (EBs) in 2016.…”

Section: Introductionmentioning

confidence: 99%

Absolute Properties of the Eclipsing γ Dor Star V404 Lyrae

Lee

Hong

Koo

et al. 2019

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We present the first high-resolution spectra for the eclipsing binary V404 Lyr showing γ Dor pulsations, which we use to study its absolute properties. By fitting models to the disentangling spectrum of the primary star, we found that it has an effective temperature of T eff,1 = 7, 330 ± 150 K and a rotational velocity of v 1 sini = 148 ± 18 km s −1 . The simultaneous analysis of our double-lined radial velocities and the pulsation-subtracted Kepler data gives us accurate stellar and system parameters of V404 Lyr. The masses, radii, and luminosities are M 1 = 2.17±0.06 M ⊙ , R 1 = 1.91±0.02 R ⊙ , and L 1 = 9.4±0.8 L ⊙ for the primary, and M 2 = 1.42±0.04 M ⊙ , R 2 = 1.79±0.02 R ⊙ , and L 2 = 2.9±0.2 L ⊙ for the secondary. The tertiary component orbiting the eclipsing pair has a mass of M 3b = 0.71±0.15 M ⊙ in an orbit of P 3b = 642±3 days, e 3b = 0.21±0.04, and a 3b = 509±2 R ⊙ . The third light of l 3 = 4.1 ± 0.2% could be partly attributable to the K-type circumbinary object. By applying a multiple frequency analysis to the eclipsesubtracted light residuals, we detected 45 frequencies with signal to noise amplitude ratios larger than 4.0. Identified as independent pulsation modes, seven frequencies (f 1 − f 6 , f 9 ), their new pulsation constants, and the location in the Hertzsprung-Russell diagram indicate that the pulsating primary is a γ Dor-type variable star.

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Section: Introductionmentioning

confidence: 99%

Absolute Properties of the Eclipsing γ Dor Star V404 Lyrae

Lee

Hong

Koo

et al. 2019

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“…Given that B stars are known to have a high rate of multiplicity (Abt et al 1990;Sana et al 2013;Moe & Di Stefano 2017), it is noteworthy that we find so few in binary systems here. This is presumably due to the fact that B-type stars, like most classes of variable star, are not well-suited to a phase modulation analysis (Murphy 2018). Generally, high-frequency oscillators are more useful clocks, but the B stars that do oscillate at high frequencies -the sdB stars and white dwarfs -often show intrinsic phase modulation that make them poor clocks (Østensen et al 2014;Silvotti et al 2018;Zong et al 2018).…”

Section: Resultsmentioning

confidence: 99%

“…Faster clocks (shorter-period pulsations) and more stable clocks allow the orbit to be determined more precisely. So far, the class of intermediate-mass stars on the main sequence known as δ Scuti stars has proved the most valuable for pulsationtiming studies (Compton et al 2016;Murphy 2018).…”

Section: Introductionmentioning

confidence: 99%

Finding binaries from phase modulation of pulsating stars with Kepler – VI. Orbits for 10 new binaries with mischaracterized primaries

Murphy

Barbara

Hey

et al. 2020

Monthly Notices of the Royal Astronomical Society

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Measuring phase modulation in pulsating stars has proved to be a highly successful way of finding binary systems. The class of pulsating main-sequence A and F variables known as δ Scuti stars are particularly good targets for this, and the Kepler sample of these has been almost fully exploited. However, some Kepler δ Scuti stars have incorrect temperatures in stellar properties catalogues, and were missed in previous analyses. We used an automated pulsation classification algorithm to find 93 new δ Scuti pulsators among tens of thousands of F-type stars, which we then searched for phase modulation attributable to binarity. We discovered 10 new binary systems and calculated their orbital parameters, which we compared with those of binaries previously discovered in the same way. The results suggest that some of the new companions may be white dwarfs.

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“…A few months later, Kahraman Aliçavuş et al ( 2017) almost doubled the threshold of P orb by taking into account only the eclipsing systems. Murphy (2018) published a review for binaries with pulsating components including also those with δ Scuti members. Qian et al (2018), using the LAMOST spectra of more than 760 δ Scuti stars, found that 88 of them are possibly members of binary or multiple systems.…”

Section: Introductionmentioning

confidence: 99%

Asteroseismology of two Kepler detached eclipsing binaries

Liakos

2020

Preprint

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The present work contains light curve, spectroscopic and asteroseismic analyses for KIC 04851217 and KIC 10686876. These systems are detached eclipsing binaries hosting a pulsating component of δ Scuti type and have been observed with the unprecedented accuracy of the Kepler space telescope. Using ground based spectroscopic observations, the spectral types of the primary components of the systems were estimated as A6V and A5V for KIC 04851217 and KIC 10686876, respectively, with an uncertainty of one subclass. The present spectral classification together with literature radial velocities curves were used to model the light curves of the systems and, therefore, to calculate the absolute parameters of their components with higher certainty. The photometric data were analysed using standard eclipsing binary modeling techniques, while their residuals were further analysed using Fourier transformation techniques in order to extract the pulsation frequencies of their host δ Scuti stars. The oscillation modes of the independent frequencies were identified using theoretical models of δ Scuti stars. The distances of the systems were calculated using the relation between the luminosity and the pulsation period for δ Scuti stars. The physical and the oscillation properties of the pulsating components of these systems are discussed and compared with others of the same type. Moreover, using all the currently known cases of δ Scuti stars in detached binaries, updated correlations between orbital and dominant pulsation periods and between log g and pulsation periods were derived. It was found that the proximity of the companion plays significant role to the evolution of the pulsational frequencies.

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Pulsating stars in binary systems: a review

Cited by 11 publications

References 107 publications

Absolute Properties of the Eclipsing γ Dor Star V404 Lyrae

Absolute Properties of the Eclipsing γ Dor Star V404 Lyrae

Finding binaries from phase modulation of pulsating stars with Kepler – VI. Orbits for 10 new binaries with mischaracterized primaries

Asteroseismology of two Kepler detached eclipsing binaries

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