Observational and Theoretical Studies of 27 δ Scuti Stars with Investigation of the Period–Luminosity Relation

Poro, Atila; Paki, Ehsan; Mazhari, Golnaz; Sarabi, Soroush; Aliçavuş, Filiz Kahraman; Farahani, Farzaneh Ahangarani; Guilani, Hamidreza; Popov, A.; Zubareva, A. M.; Jalalabadi, Behjat Zarei; Nourmohammad, Mahshid; Davoudi, Fatemeh; Arani, Zahra Sabaghpour; Ghalee, Amir

doi:10.1088/1538-3873/ac12dc

Cited by 18 publications

(16 citation statements)

References 44 publications

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“…The excess of second-ridge stars was identified by Ziaali et al (2019), and also noted by Jayasinghe et al (2020) and Poro et al (2021). Note that Poro et al (2021, their figure 4) identified this ridge with firstovertone modes but that is not consistent with the well-established period ratio of 0.77 between the fundamental and first overtone in 𝛿 Sct stars (Petersen & Christensen-Dalsgaard 1996).…”

Section: Second Ridge Starsmentioning

confidence: 91%

“…The P-L relations of classical pulsators have a long history, particularly with Cepheids (Leavitt & Pickering 1912) and RR Lyr variables, making these stars indispensable distance indicators. The P-L relations for their mainsequence cousins-the 𝛿 Scuti stars-were studied by McNamara (1997McNamara ( , 2011 using parallaxes from Hipparcos and have recently been revisited using Gaia parallaxes to refine the luminosities (Ziaali et al 2019;Jayasinghe et al 2020;Poro et al 2021;Gaia Collaboration et al 2022). However, in many cases the catalogued periods were determined decades ago from ground-based photometry.…”

Section: Introductionmentioning

confidence: 99%

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Revisiting bright delta Scuti stars and their period-luminosity relation with TESS and Gaia DR3

Barac¹,

Bedding²,

Murphy³

et al. 2022

Preprint

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We have used NASA's TESS mission to study catalogued 𝛿 Scuti stars. We examined TESS light curves for 434 stars, including many for which few previous observations exist. We found that 62 are not 𝛿 Scuti pulsators, with most instead showing variability from binarity. For the 372 𝛿 Scuti stars, we provide a catalogue of the period and amplitude of the dominant pulsation mode. Using Gaia DR3 parallaxes, we place the stars in the period-luminosity diagram and confirm previous findings that most stars lie on a ridge that corresponds to pulsation in the fundamental radial mode, and that many others fall on a second ridge that is a factor two shorter in period. This second ridge is seen more clearly than before, thanks to the revised periods and distances. We demonstrate the value of the period-luminosity diagram in distinguishing 𝛿 Scuti stars from short-period RR Lyrae stars, and we find several new examples of high-frequency 𝛿 Scuti stars with regular sequences of overtone modes, including XX Pyx and 29 Cyg. Finally, we revisit the sample of 𝛿 Scuti stars observed by Kepler and show that they follow a tight period-density relation, with a pulsation constant for the fundamental mode of 𝑄 = 0.0315 d.

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Section: Second Ridge Starsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Revisiting bright delta Scuti stars and their period-luminosity relation with TESS and Gaia DR3

Barac¹,

Bedding²,

Murphy³

et al. 2022

Preprint

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“…In order to improve the P-L relationship and be used as standard candles, Fernie (1992) examined combining a few Cepheids and δ Scuti stars. In the following decades, other studies made an effort to improve the P-L relationship for δ Scuti stars, such as Laney et al (2002), McNamara et al (2004, 2007, McNamara (2011), Ziaali et al (2019, Jayasinghe et al (2020), Poro et al (2021), Barac et al (2022), andMartínez-Vázquez et al (2022).…”

Section: Introductionmentioning

confidence: 99%

Period–Luminosity Relationship for δ Scuti Stars Revisited

Poro,

Jafarzadeh,

Harzandjadidi

et al. 2024

Res. Astron. Astrophys.

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The Gaia DR3 parallax approach was used to estimate the absolute parameters of 2375 $\delta$ Scuti stars from the ASAS catalog. The selected stars have a variety of observational characteristics, with a higher than 80\% probability of being $\delta$ Scuti stars. We have displayed all the stars in the Hertzsprung-Russell (H-R) diagram along with the $\delta$ Scuti instability strip, the Zero Age Main Sequence (ZAMS), and the Terminal-Age Main Sequence (TAMS). Then, we determined which fundamental and overtone modes each star belongs to using pulsation constant ($Q$) calculations. In addition, we evaluated the parameters in the $Q$ calculation equation using three machine learning methods, which showed that surface gravity and temperature have the greatest effect on its calculation. The Period-Luminosity ($P-L$) relationship of the $\delta$ Scuti stars was also revisited. Eventually, using least squares linear regression, we made four linear fits for fundamental and overtone modes and updated their relationships.

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“…mustafaturansaglam@ogr.iu.edu.tr Robotic telescopes or surveys from space allow to detect numerous Delta Scuti variables like in the case of TESS (Antoci et al 2019) or OGLE (Soszyński et al 2021). All these stars are then used to construct or update the period-luminosity relation which is a powerful tool to derive luminosities and thus distances for Delta Scuti variables (McNamara 2011;Poro et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Discovery of a Short Period Pulsator from Istanbul University Observatory

SAĞLAM

ÇÖRDÜK

Aliş

et al. 2022

Turkish Journal of Astronomy and Astrophysics

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Ötegezegen barındıran XO-2 yıldızının alanında yeni bir kısa dönemli zonklayan değişenin keşfini bildiriyoruz. Değişen yıldız, mukayese olarak kullanılırken farkedildi. Kaynağın değişkenliğinin belirlenmesi için kapsamlı bir takip programı izlendi. Çoklu dalgaboyunda elde edilen ışık eğrilerinin analizinden periyodunun yaklaşık P~0.95 saat olduğu belirlendi. Değişim periyodu, genliği ve renk indeksi bu kaynağın büyük olasılıkla bir delta Scuti türü değişen olduğunu gösteriyor. Mutlak parlaklığı (M_{v}) ve renk indeksi ((B-V)_{0}) sırasıyla 2.76 ve 0.22 olarak belirlendi. Bu renk indeksi A7 tayf türüne ve yaklaşık 7725 K'lik bir etkin sıcaklığa karşılık geliyor. Işık eğrilerinin ayrıca makine öğrenmesi yöntemiyle analizi değişenin ortalama %73 olasılıkla delta Scuti türü olduğunu gösteriyor.

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Observational and Theoretical Studies of 27 δ Scuti Stars with Investigation of the Period–Luminosity Relation

Cited by 18 publications

References 44 publications

Revisiting bright delta Scuti stars and their period-luminosity relation with TESS and Gaia DR3

Revisiting bright delta Scuti stars and their period-luminosity relation with TESS and Gaia DR3

Period–Luminosity Relationship for δ Scuti Stars Revisited

Discovery of a Short Period Pulsator from Istanbul University Observatory

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