KeplerGO/lightkurve: Lightkurve v1.6.0

Based on the TESS (Transiting Exoplanet Survey Satellite) phase dependent light curves, we confirm the eclipsing type variability nature for two G – type dwarfs: TYC 1417-891-1 and TYC 1478-742-1. Both objects show EA (Algol – type) light curves morphology. Orbital period for TYC 1417-891-1 is P ≈ 8.0 day and for TYC 1478-742-1, P ≈ 13.6 day. We present Gaia EDR3 and TESS catalogue important physical parameters as well as LAMOST spectra. Both objects are relatively bright and are located at a distance of 260.59 (±3.21) pc (TYC 1417-891-1) and 117.42 (±0.74) pc (TYC 1478-742-1). The TESS light curve of TYC 1478-742-1 show also flares as well. We discuss possible nature of the secondary and faint objects around these stars.

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“…We downloaded the PDCSAP light curves for these stars from the MAST using the lightkurve package (Barentsen et al, 2019).…”

Section: Tess Light Curvesmentioning

confidence: 99%

TYC 1417-891-1 and TYC 1478-742-1: Eclipsing Variable Stars. The Gaia EDR3 and TESS Photometric Data

Gigoyan

Kostandyan

2023

ComBAO

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“…The amplitude of variability is 0.4 m , the period is 19.74 days. The lightkurve package based on Python was used to analyze the TESS light curve (Barentsen et al, 2019).…”

Section: Tessmentioning

confidence: 99%

Investigations of late-type giant stars from the First Byurakan Spectral Sky Survey

Kostandyan

Gigoyan

2023

ComBAO

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We study late-type giants found in the First Byurakan Survey (FBS) data base. The third Gaia data release (Gaia EDR3) photometric and astrometric data have been used to characterize our sample of 1 100 M-type giants and 130 C-type stars found at high latitudes. Phase dependent light-curves from large sky area variability data bases such as Catalina Sky Survey (CSS) and The light curves from the Catalina Sky Survey (CSS), All-Sky Automated Survey for Supernovae (ASAS-SN) and Transiting Exoplanet Survey Satellite (TESS) databases were exploited to study their variability nature. Using TESS light curves, the variability types of some objects have been established for the first time.

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Rotational Velocities of Am and Non-chemical-peculiar Stars Based on Kepler and LAMOST DR5

Qin

Luo

Hou

et al. 2021

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Rotation is a critical physical process operating in the formation of Am stars. There is a strong correlation between low-velocity rotation and chemical peculiarity. However, the existence of many non-chemical-peculiar slow rotators challenges the understanding of Am stars. The purpose of our work is to search for low-velocity rotating non-chemical-peculiar A-type stars and Am stars and to make a comparative analysis. In this paper, we pick out a sample from the LAMOST–Kepler project, including 21 Am stars, 125 non-chemical-peculiar slow rotators, and 53 non-chemical-peculiar fast rotators. We calculate the rotational frequencies through a periodic change of light curves caused by inhomogeneous stellar surfaces and then obtain the rotational velocities. For slow rotators, the age of Am stars is statistically younger than that of non-chemical-peculiar stars in the same temperature bin. In the comparison of the period, the average amplitude, and stellar mass of Am and non-chemical-peculiar stars, we discover that there is no difference in the photometric variability between Am and non-chemical-peculiar stars, which implies similar inhomogeneities on the surfaces. The average amplitude of non-chemical-peculiar stars has a downward trend with the increase of effective temperature and stellar mass, which is consistent with the theoretical prediction caused by weak dynamo-generated magnetic fields in A-type stars. In addition, we confirm four non-chemical-peculiar stars that have flares by checking field-of-view images, pixel images, and pixel-level light curves.

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KeplerGO/lightkurve: Lightkurve v1.6.0

Cited by 3 publications

References 0 publications

TYC 1417-891-1 and TYC 1478-742-1: Eclipsing Variable Stars. The Gaia EDR3 and TESS Photometric Data

TYC 1417-891-1 and TYC 1478-742-1: Eclipsing Variable Stars. The Gaia EDR3 and TESS Photometric Data

Investigations of late-type giant stars from the First Byurakan Spectral Sky Survey

Rotational Velocities of Am and Non-chemical-peculiar Stars Based on Kepler and LAMOST DR5

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