François Cheng, du Tao à la « Voie christique »

Bertaud, Madeleine

doi:10.3917/trans.124.0129

Cited by 3 publications

(2 citation statements)

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“…Campaign HD 73045 is classified as an Am star by Bidelman ( 1956 ) and Bertaud ( 1960 ) with a spectral type of A7.2 (Kraus & Hillenbrand 2007 ) and is classified as an SB1 (Debernardi et al 2000 ;Carquillat & Prieur 2007 ). This star was e xtensiv ely studied by Fossati et al ( 2007Fossati et al ( , 2008, who derived the basic physical parameters and chem-ical composition.…”

Section: Starmentioning

confidence: 99%

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Study of chemically peculiar stars – I. High-resolution spectroscopy and K2 photometry of Am stars in the region of M44

Joshi

Trust

Semenko

et al. 2022

Monthly Notices of the Royal Astronomical Society

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We present a study based on the high-resolution spectroscopy and K2 space photometry of five chemically peculiar stars in the region of the open cluster M44. The analysis of the high-precision photometric K2 data reveals that the light variations in HD 73045 and HD 76310 are rotational in nature and caused by spots or cloud-like co-rotating structures, which are non-stationary and short-lived. The time-resolved radial velocity measurements, in combination with the K2 photometry, confirm that HD 73045 does not show any periodic variability on time-scales shorter than 1.3 d, contrary to previous reports in the literature. In addition to these new rotational variables, we discovered a new heartbeat system, HD 73619, where no pulsational signatures are seen. The spectroscopic and spectropolarimetric analyses indicate that HD 73619 belongs to the peculiar Am class, with either a weak or no magnetic field, considering the 200-G detection limit of our study. The least-squares deconvolution profiles for HD 76310 indicate a complex structure in its spectra, suggesting that this star is either part of a binary system or surrounded by a cloud shell. When placed in the Hertzsprung–Russell diagram, all studied stars are evolved from the main sequence and situated in the δ Scuti instability strip. This work is relevant for further detailed studies of chemically peculiar stars, for example on inhomogeneities (including spots) in the absence of magnetic fields and the origin of the pulsational variability in heartbeat systems.

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Section: Starmentioning

confidence: 99%

“…HD 73618 is classified as A0 spectral type (Cannon & Pickering 1993 ). It is also referred to as an Am star (Bidelman 1956 ;Bertaud 1960 ;Rebeirot 1966 ). The vsin i value for this star has been reported as 51 km s −1 (Abt & Willmarth 1999 ) and 44 km s −1 (Debernardi et al 2000 ).…”

Section: Hd 73618/kw 224 (Praesepe)mentioning

confidence: 99%