ASTEROSEISMOLOGY OF THE NEARBY SN-II PROGENITOR: RIGEL. I. THE<i>MOST</i>HIGH-PRECISION PHOTOMETRY AND RADIAL VELOCITY MONITORING

Moravveji, E.; Guinan, E. F.; Shultz, Matt; Williamson, Michael H.; Moya, A.

doi:10.1088/0004-637x/747/2/108

Cited by 28 publications

(23 citation statements)

References 39 publications

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“…Moreover, B type stars were shown to exhibit a much larger diversity in their variability than expected before from ground-based observations. CoRoT and Kepler photometry combined with high-resolution ground-based spectroscopy revealed, e.g., stars with spotted (or at least inhomogeneous) surface configurations (e.g., Degroote et al 2011, Pápics et al 2012) pointing towards the presence of a magnetic field (e.g., Briquet et al 2013), pulsating stars outside and constant stars inside the theoretical instability strips (e.g., Briquet et al 2011, Pápics et al 2011 calculated with current stellar evolution models and oscillation codes, stars exhibiting gravito-inertial modes (Pápics et al 2012, Thoul et al 2013, and pulsations driven by more rare excitation mechanisms, such as tidal excitation and non-linear resonant excitation (Pápics et al 2013) in addition to the ε-mechanism in blue supergiants (Moravveji et al 2012b). …”

Section: Classical Pulsatorsmentioning

confidence: 99%

The PLATO 2.0 mission

et al. 2014

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Section: Classical Pulsatorsmentioning

confidence: 99%

The PLATO 2.0 mission

et al. 2014

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“…With the availability of high-cadence µmag-level precision space photometry, a new era has begun for the detection and interpretation of blue supergiant variability. The few earliest data sets revealed large diversity in behaviour and periodicities, making it clear that the search for optimal asteroseismology targets among blue supergiants is challenging (Lefèvre et al 2005;Saio et al 2006;Moffat et al 2008;Aerts et al 2010;Moravveji et al 2012;Aerts et al 2013). A step forward was achieved from combined Kepler photometry and long-term high-resolution spectroscopy of the O9.5Iab star HD 188209 (Aerts et al 2017a).…”

Section: Introductionmentioning

confidence: 99%

K2 photometry and HERMES spectroscopy of the blue supergiant ρ Leo: rotational wind modulation and low-frequency waves

Aerts

Bowman

Simón‐Díaz

et al. 2018

Monthly Notices of the Royal Astronomical Society

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We present an 80-d long uninterrupted high-cadence K2 light curve of the B1Iab supergiant ρ Leo (HD 91316), deduced with the method of halo photometry. This light curve reveals a dominant frequency of f rot = 0.0373 d −1 and its harmonics. This dominant frequency corresponds with a rotation period of 26.8 d and is subject to amplitude and phase modulation. The K2 photometry additionally reveals multiperiodic low-frequency variability (< 1.5 d −1 ) and is in full agreement with low-cadence high-resolution spectroscopy assembled during 1800 days. The spectroscopy reveals rotational modulation by a dynamic aspherical wind with an amplitude of about 20 km s −1 in the Hα line, as well as photospheric velocity variations of a few km s −1 at frequencies in the range 0.2 to 0.6 d −1 in the Si III 4567Å line. Given the large macroturbulence needed to explain the spectral line broadening of the star, we interpret the detected photospheric velocity as due to travelling super-inertial low-degree large-scale gravity waves with dominant tangential amplitudes and discuss why ρ Leo is an excellent target to study how the observed photospheric variability propagates into the wind.

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“…An additional obstacle is the relatively short campaign lengths ranging from weeks (MOST) to months (CoRoT; Kepler 2; BRITE) which is not sufficient to investigate longer oscillation periods reaching up to several months in the case of OB supergiants (e.g. Moravveji et al 2012). The long-term high-duty-cycle monitoring is also useful for main-sequence variables (β Cep and SPB stars) to check the possible long-term frequency or amplitude variability.…”

Section: Introductionmentioning

confidence: 99%

Variability survey of brightest stars in selected OB associations

Laur

Eenmäe

Tuvikene

et al. 2017

A&A

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Context. The stellar evolution theory of massive stars remains uncalibrated with high-precision photometric observational data mainly due to a small number of luminous stars that are monitored from space. Automated all-sky surveys have revealed numerous variable stars but most of the luminous stars are often overexposed. Targeted campaigns can improve the time base of photometric data for those objects. Aims. The aim of this investigation is to study the variability of luminous stars at different timescales in young open clusters and OB associations. Methods. We monitored 22 open clusters and associations from 2011 to 2013 using a 0.25-m telescope. Variable stars were detected by comparing the overall light-curve scatter with measurement uncertainties. Variability was analysed by the light curve feature extraction tool FATS. Periods of pulsating stars were determined using the discrete Fourier transform code SigSpec. We then classified the variable stars based on their pulsation periods and available spectral information. Results. We obtained light curves for more than 20 000 sources of which 354 were found to be variable. Amongst them we find 80 eclipsing binaries, 31 α Cyg, 13 β Cep, 62 Be, 16 slowly pulsating B, 7 Cepheid, 1 γ Doradus, 3 Wolf-Rayet and 63 late-type variable stars. Up to 55% of these stars are potential new discoveries as they are not present in the Variable Star Index (VSX) database. We find the cluster membership fraction for variable stars to be 13% with an upper limit of 35%.

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ASTEROSEISMOLOGY OF THE NEARBY SN-II PROGENITOR: RIGEL. I. THEMOSTHIGH-PRECISION PHOTOMETRY AND RADIAL VELOCITY MONITORING

Cited by 28 publications

References 39 publications

The PLATO 2.0 mission

The PLATO 2.0 mission

K2 photometry and HERMES spectroscopy of the blue supergiant ρ Leo: rotational wind modulation and low-frequency waves

Variability survey of brightest stars in selected OB associations

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