Lithium-Rich Classical Cepheid V1033 Cyg: Evolutionary Status

Udovichenko, S. N.; Kovtyukh, V. V.; Keir, L. E.

doi:10.18524/1810-4215.2019.32.182232

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…5, where we have also plotted, for a comparison, the other four MW lithium-rich DCEPs. We adopted the T eff values from Kovtyukh et al (2019) for ASAS J075842-2536.1, ASAS J131714-6605.0 and V371 Per, while for V1033 Cyg we adopted the measure by Udovichenko et al (2019). The luminosities were estimated by integrating the SEDs, which, as for V363 Cas, were calculated using the VOSA software.…”

Section: Discussionmentioning

confidence: 99%

V363 Cassiopeiae: a new lithium-rich Galactic Cepheid

Catanzaro

Ripepi

Clementini³

et al. 2020

A&A

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Context. Classical Cepheids (DCEPs) are important astrophysical objects not only as standard candles in the determination of the cosmic distance ladder, but also as a testbed for the stellar evolution theory. This is based on the strict connection between their pulsation (period(s) and amplitudes) and stellar parameters (luminosity, mass, effective temperature, and metallicity). Aims. We examine the nature of the Galactic DCEP V363 Cas and other DCEPs that show cosmic abundances of lithium in their atmospheres. Methods. We collected three epochs of high-resolution spectroscopy for V363 Cas with HARPS-N at the TNG. We measured accurate stellar parameters: the effective temperatures, gravities, microturbulences, radial velocities, and metal abundances. Results. We detected a lithium abundance of A(Li) = 2.86 ± 0.10 dex, along with iron, carbon, and oxygen abundances of [Fe/H] = −0.30 ± 0.12 dex, [C/H] = −0.06 ± 0.15 dex, and [O/H] = 0.00 ± 0.12 dex. V363 Cas is the fifth of the Milky Way DCEPs to exhibit a Li-rich feature. An analysis of historical time-series spanning a 100-year interval shows that the period of V363 Cas is increasing, with a sharp acceleration after HJD = 2 453 000 days. This is a clear indication of a first crossing of the instability strip. Conclusions. Our results favour the scenario in which the five Galactic Li-rich DCEPs are on their first crossing of the instability strip and have had slowly rotating progenitors during their main-sequence phase.

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Section: Discussionmentioning

confidence: 99%

V363 Cassiopeiae: a new lithium-rich Galactic Cepheid

Catanzaro

Ripepi

Clementini³

et al. 2020

A&A

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“…(APASS, 2010), check=UCAC4-539-050615). The 48 cm reflector AZT-3 with the f/4.5 Newtonian focus and CCD photometer with chip Sony ICX429ALL (600x800 pixels), equipped with V filter, Peltier cooler were used (Udovichenko, 2012). The hermetic housing and thermoelectric (Peltier) cooler provide a temperature difference between the sensor CCD and the environment of about -40 o C, and the temperature was supported by a constant.…”

Section: Observationsmentioning

confidence: 99%

Photometry and Blazhko Effect in Rr Lyr-Type Star Ae Leo

Udovichenko

Keir

2017

OAP

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The photometric observations for the RR Lyr-type star AE Leo in the Astronomical station near Odessa using the 48-cm reflector AZT-3 and the CCD photometer equipped with the V filter have been carried out. The light curves shows variable amplitude of light maxima and the moderate Blazhko effect. The analysis of the O-C light maxima for our observations and the ASAS, NSVS data indicates the secular period changes.

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Evolutionary Status and Fundamental Parameters of the Cepheid V1033 Cyg

Fadeyev

2020

Astron. Lett.

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Lithium-Rich Classical Cepheid V1033 Cyg: Evolutionary Status

Cited by 3 publications

References 5 publications

V363 Cassiopeiae: a new lithium-rich Galactic Cepheid

V363 Cassiopeiae: a new lithium-rich Galactic Cepheid

Photometry and Blazhko Effect in Rr Lyr-Type Star Ae Leo

Evolutionary Status and Fundamental Parameters of the Cepheid V1033 Cyg

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