<i>uvby</i> photometry of the magnetic chemically peculiar 
 stars HD 37776, HR 2258, HR 6958, and 108 Aquarii

Adelman, Saul J.

doi:10.1051/aas:1997211

Cited by 16 publications

(2 citation statements)

References 8 publications

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“…HD 37776 is a well-known He-strong B2 IV star showing rotationally modulated spectroscopic, magnetic and photometric variations with the period 1.538675(5) days (Adelman, 1997). Mikulášek et al, 2007a suspected that the period is increasing.…”

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confidence: 99%

The extremely rapid rotational braking of the magnetic helium-strong star HD 37776

Mikulášek

Krtička²,

Henry

et al. 2008

A&A

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Context. Light and spectrum variations of the magnetic chemically peculiar (mCP) stars are explained by the oblique rigid rotator model with a rotation period usually assumed to be stable on a long time scale. A few exceptions, such as CU Vir or 56 Ari, have been reported as displaying an increase in their rotation period. A possible increase in the period of light and spectrum variations has also been suggested from observations of the helium-strong mCP star HD 37776 (V901 Ori). Aims. In this paper we attempt to confirm the possible period change of HD 37776 and discuss a possible origin of this change as a consequence of i) duplicity; ii) precession; iii) evolutionary changes; and iv) continuous/discrete/transient angular momentum loss. Results. We confirm the previously suspected gradual increase in the 1. d 5387 period of HD 37776 and find that it has lengthened by a remarkable 17.7 ± 0.7 s over the past 31 years. We also note that a decrease in the rate of the period change is not excluded by the data. The shapes of light curves in all colours were found to be invariable. Conclusions. After ruling out light-time effects in a binary star, precession of the rotational axis, and evolutionary changes as possible causes for the period change, we interpret this ongoing period increase as a braking of the star's rotation, at least in its surface layers, due to the momentum loss through events or processes in the extended stellar magnetosphere.

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confidence: 99%

The extremely rapid rotational braking of the magnetic helium-strong star HD 37776

Mikulášek

Krtička²,

Henry

et al. 2008

A&A

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“…The photometric period has been refined a number of times since (Kodaira 1973;North & Burnet 1991), and more recently to 3.735239±0.000024 d using photometry and magnetic measurements . Changes in the shape of the light curve over time have been proposed to be indicative of precession of the magnetic axis (Adelman & Knox 1994;Adelman 1997Adelman , 1999. This star was also observed with Hipparcos, and an automated period search yielded a value of 3.7342 d .…”

Section: Notes On Individual Starsmentioning

confidence: 90%

Magnetic OB[A] Stars with TESS: probing their Evolutionary and Rotational properties (MOBSTER) – I. First-light observations of known magnetic B and A stars

David-Uraz

Neiner

Sikora

et al. 2019

Monthly Notices of the Royal Astronomical Society

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In this paper we introduce the MOBSTER collaboration and lay out its scientific goals. We present first results based on the analysis of nineteen previously known magnetic O, B and A stars observed in 2-minute cadence in sectors 1 and 2 of the Transiting Exoplanet Survey Satellite (TESS ) mission. We derive precise rotational periods from the newly obtained light curves and compare them to previously published values. We also discuss the overall photometric phenomenology of the known magnetic massive and intermediate-mass stars and propose an observational strategy to augment this population by taking advantage of the high-quality observations produced by TESS.

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On‐line database of photometric observations of magnetic chemically peculiar stars

Mikulášek¹,

Janík

Zverko

et al. 2007

Astron Nachr

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We present our extensive project of the On-line database of photometric observations of magnetic chemically peculiar stars to collect published data of photometric observations of magnetic chemically peculiar (mCP) stars in the optical and near IR regions. Now the nascent database contains more than 107 000 photometric measurements of 102 mCP stars and will be continually supplemented with published or new photometric data on these and about 150 additional mCP stars. This report describes the structure and organization of the database. Moreover, for the all included data we estimated the error of measurements and the effective amplitudes of the light curves.

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uvby photometry of the magnetic chemically peculiar stars HD 37776, HR 2258, HR 6958, and 108 Aquarii

Cited by 16 publications

References 8 publications

The extremely rapid rotational braking of the magnetic helium-strong star HD 37776

The extremely rapid rotational braking of the magnetic helium-strong star HD 37776

Magnetic OB[A] Stars with TESS: probing their Evolutionary and Rotational properties (MOBSTER) – I. First-light observations of known magnetic B and A stars

On‐line database of photometric observations of magnetic chemically peculiar stars

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