A search for period changes in<i>δ</i>Scuti stars with the super-LOTIS sky patrol system

Blake, Cullen H.; Fox, D. B.; Park, H. S.; Williams, G. G.

doi:10.1051/0004-6361:20021676

Cited by 6 publications

(4 citation statements)

References 25 publications

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“…Our results suggest that resonant three-mode interactions can be significant in δ Sct stars, and the ubiquity of large μ across all of our models may explain why amplitude variations (Bowman et al 2016) and large P P  (Breger & Pamyatnykh 1998;Blake et al 2003;Bowman et al 2021) are commonly observed. However, our analysis did not model the parent driving and therefore did not solve for the overall mode amplitudes, nor for their relation to the surface flux perturbations.…”

Section: Discussionmentioning

confidence: 62%

“…Similarly, Bowman et al (2021) find that the fundamental and first-overtone radial modes of the HADS star KIC 5950759 exhibits a linear period change P P 10 yr 6 1   -over a timescale of several years, at least two orders of magnitude higher than predicted by evolutionary models. Both Breger & Pamyatnykh (1998) and Bowman et al (2021) suggest (see also Blake et al 2003) that the rapid period changes could be the result of nonlinear mode interactions. These interactions can enable a fast transfer of energy among the modes and induce rapid amplitude-dependent variations in their oscillation periods.…”

Section: Introductionmentioning

confidence: 99%

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Resonant Mode Coupling in δ Scuti Stars

Mohammed

Weinberg

2023

ApJ

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Delta Scuti (δ Sct) variables are intermediate-mass stars that lie at the intersection of the main sequence and the instability strip on the Hertzsprung–Russell diagram. Various lines of evidence indicate that nonlinear mode interactions shape their oscillation spectra, including the particularly compelling detection of resonantly interacting mode triplets in the δ Sct star KIC 8054146. Motivated by these observations, we use the theory of three-mode coupling to study the strength and prevalence of nonlinear mode interactions in 14 δ Sct models that span the instability strip. For each model, we calculate the frequency detunings and nonlinear coupling strengths of ∼104 unique combinations of mode triplets. We find that all the models contain at least ∼100 well-coupled triplets whose detunings and coupling strengths are consistent with the triplets identified in KIC 8054146. Our results suggest that resonant mode interactions can be significant in δ Sct stars and may explain why many exhibit rapid changes in amplitude and oscillation period.

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Section: Discussionmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Resonant Mode Coupling in δ Scuti Stars

Mohammed

Weinberg

2023

ApJ

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“…We suggest that the classifying methods of survey data should be more precise by adding more criteria, specifically to discriminate between the HADS and W UMa stars. Blake et al (2003) studied the period changes of 18 ROTSE-I δ Scuti stars by comparing their result with ROTSE-I data. Four of their objects are the same with this study.…”

Section: Discussionmentioning

confidence: 99%

Multiband photometric re-classification of ROTSE-IδScuti type stars

Jin

Kim

Kwon

et al. 2003

A&A

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Abstract. We present multi-passband CCD photometry of 20 ROTSE-I δ Scuti type pulsating stars and 1 RR Lyrae star to reclassify their variable types using the comparison of amplitudes between V and I passbands. For the re-classification, we used a criterion that pulsating stars have larger amplitude differences between passbands than eclipsing binaries because brightness changes of pulsating stars are mainly due to the temperature variations. As a result, only six stars were re-confirmed as δ Scuti variables and thirteen stars turned out to be W UMa type eclipsing binaries. The other two stars were identified as one cataclysmic variable and one non-variable, respectively. Our results suggest that a number of ROTSE-I δ Scuti type stars, which do not show typical pulsating light curves of high amplitude δ Scuti stars, are W UMa type eclipsing binaries.

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“…From 1999 to 2003 Super-LOTIS was configured with a prime focus imager in order to provide better coverage of the large Burst and Transient Source Experiment (BATSE) error boxes. Selected results from that system and its predecessor, LOTIS, are included in Park et al [2], Williams et al [3], Schaefer et al [4], Park et al [5], Hurley et al [6], Castro Cerón et al [7], and Blake et al [8].…”

Section: System Overviewmentioning

confidence: 99%

The Robotic Super-LOTIS Telescope: Results & Future Plans

Williams¹,

Milne²,

Park³

et al. 2008

AIP Conference Proceedings

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We provide an overview of the robotic Super-LOTIS (Livermore Optical Transient Imaging System) telescope and present results from gamma-ray burst (GRB) afterglow observations using Super-LOTIS and other Steward Observatory telescopes. The 0.6-m Super-LOTIS telescope is a fully robotic system dedicated to the measurement of prompt and early time optical emission from GRBs. The system began routine operations from its Steward Observatory site atop Kitt Peak in April 2000 and currently operates every clear night. The telescope is instrumented with an optical CCD camera and a four position filter wheel. It is capable of observing Swift Burst Alert Telescope (BAT) error boxes as early or earlier than the Swift UV/Optical Telescope (UVOT). Super-LOTIS complements the UVOT observations by providing early R- and I-band imaging. We also use the suite of Steward Observatory telescopes including the 1.6-m Kuiper, the 2.3-m Bok, the 6.5-m MMT, and the 8.4-m Large Binocular Telescope to perform follow-up optical and near infrared observations of GRB afterglows. These follow-up observations have traditionally required human intervention but we are currently working to automate the 1.6-m Kuiper telescope to minimize its response time.Comment: 4 pages, submitted to the proceedings of Gamma Ray Bursts 2007, Santa Fe, New Mexico, November 5-9 200

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A search for period changes inδScuti stars with the super-LOTIS sky patrol system

Cited by 6 publications

References 25 publications

Resonant Mode Coupling in δ Scuti Stars

Resonant Mode Coupling in δ Scuti Stars

Multiband photometric re-classification of ROTSE-IδScuti type stars

The Robotic Super-LOTIS Telescope: Results & Future Plans

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