The variations of the magnetic AP star 49 Cam.

Bonsack, W. K.; Pilachowski, Catherine A.; Wolff, Sidney C.

doi:10.1086/152623

Cited by 18 publications

(16 citation statements)

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“…in 1987-1992, during a program to search for binaries among cool Ap stars , using the CORAVEL scanner attached to the 1-m Swiss telescope at Observatoire de Haute Provence. The mean value of six RV estimations was equal to +7.96 ± 0.31 km s -1 , and is close to values given by Bonsack et al (1974). To check further the variability of 49 Cam, observations were continued in 1996, 1997 and 1998 both at Sternberg Astronomical Institute (Moscow) and Haute Provence Observatory.…”

Section: Radial Velocities Of the Roap Star 7 Equsupporting

confidence: 79%

“…49 Cam was suspected to be a RV variable star during the year 1994, thanks to a joint program of search for RV variability in selected cool Ap stars (Mkrtichian et al 1997), carried out by the Astronomical Institute (Moscow, Russia) and the Odessa Observatory (Ukraine), using the CORAVEL-type scanner (hereafter RVS) (Tokovinin 1987). The 1994 observations of 49 Cam show a significant departure of RV (approximately +13 km s _1 ) from the value +1.4 ± 1.5 km s -1 given in Wilson's General Catalog of Radial Velocities (Wilson 1953;Young 1945) as well as from the available published RVs of 49 Cam such as +5.3 ± 0.3 km s-1 (van den Heuvel 1971) and +7.2 ± 0.12 km s" 1 (Bonsack et al 1974). Due to the suspected binarity of the star, the 1994 observations were continued in 1995.…”

Section: Radial Velocities Of the Roap Star 7 Equmentioning

confidence: 64%

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On the Binarity of the F0p Magnetic Stars ϒ Equ and 49 Cam

Mkrtichian

Samus

Gorynya

et al. 1999

International Astronomical Union Colloquium

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The magnetic field investigations of the rapidly-oscillating (ro)Ap star ϒ Equ show a very long magnetic (rotational) period of about 74 years (Leroy et al. 1994; Bychkov & Shtol 1997). No significant changes of radial velocities were detected during the history of investigations of this star. Recently, Scholz et al. (1997) (hereafter S97) reported a rapid increase of radial velocity (RV) of ϒ Equ from the mean value of -16.81 km s−1 up to a maximum at -4.28 km s−1 within the interval JD 2449608 – JD 2450356, and suggested that ϒ Equ is a long-period binary star with high eccentricity. Such a probable discovery of binary motion of ϒ Equ is very interesting, since it opens the possibility to compare asteroseismic parameters of the star with those obtained from the binary orbit.

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Section: Radial Velocities Of the Roap Star 7 Equsupporting

confidence: 79%

Section: Radial Velocities Of the Roap Star 7 Equmentioning

confidence: 64%

On the Binarity of the F0p Magnetic Stars ϒ Equ and 49 Cam

Mkrtichian

Samus

Gorynya

et al. 1999

International Astronomical Union Colloquium

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“…HJD (v max ) = 2 441 254.08 + 4.28679(±0.000005) E. Figure 3 shows the light curves of 49 Cam with crosses (×'s) being the observations of Bonsack et al (1974), closed squares those of Adelman (1997b), and open circles those of this paper.…”

Section: Cammentioning

confidence: 90%

“…Adelman (1997b) used 89 FCAPT uvby observations obtained between 1990 and 1996 as well as 11 uvby values from Bonsack et al (1974) to adjust the ephemeris of Leroy et al (1994) and Leroy (1995). During the 2003−04 observing season (year 14 for FCAPT observations) 75 new uvby observations were made.…”

Section: Cammentioning

confidence: 99%

uvby FCAPT photometry of the mCP stars HD 32633, $\mathsf{\theta}$ Aur, 49 Cam, and 3 Hya

Adelman¹,

Kaewkornmaung²

2005

A&A

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“…The Ap star 49 Cam (HD 62140) was classified as F0p (SrEu) by Cowley (1968) and later as A8p (SrEu) by Leone et al (2000a). An early detailed study of 49 Cam was carried out by Bonsack et al (1974), who examined the photometric and spectroscopic variations of this star. Later, a detailed analysis of the magnetic field geometry was performed by Leroy et al (1994) and Leroy et al (1996) using broadband linear polarisation measurements.…”

Section: Introductionmentioning

confidence: 99%

The complex magnetic field topology of the cool Ap star 49 Cam

Silvester¹,

Kochukhov²,

Rusomarov³

et al. 2017

Monthly Notices of the Royal Astronomical Society

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49 Cam is a cool magnetic chemically peculiar star which has been noted for showing strong, complex Zeeman linear polarisation signatures. This paper describes magnetic and chemical surface maps obtained for 49 Cam using the INVERS10 magnetic Doppler imaging code and high-resolution spectropolarimetric data in all four Stokes parameters collected with the ES-PaDOnS and Narval spectropolarimeters at the Canada-France-Hawaii Telescope and Pic du Midi Observatory. The reconstructed magnetic field maps of 49 Cam show a relatively complex structure. Describing the magnetic field topology in terms of spherical harmonics, we find significant contributions of modes up to = 3, including toroidal components. Observations cannot be reproduced using a simple low-order multipolar magnetic field structure. 49 Cam exhibits a level of field complexity that has not been seen in magnetic maps of other cool Ap stars. Hence we concluded that relatively complex magnetic fields are observed in Ap stars at both low and high effective temperatures. In addition to mapping the magnetic field, we also derive surface abundance distributions of nine chemical elements, including Ca, Sc, Ti, Cr, Fe, Ce, Pr, Nd, Eu. Comparing these abundance maps with the reconstructed magnetic field geometry, we find no clear relationship of the abundance distributions with the magnetic field for some elements. However, for other elements some distinct patterns are found. We discuss these results in the context of other recent magnetic mapping studies and theoretical predictions of radiative diffusion.

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The variations of the magnetic AP star 49 Cam.

Cited by 18 publications

References 0 publications

On the Binarity of the F0p Magnetic Stars ϒ Equ and 49 Cam

On the Binarity of the F0p Magnetic Stars ϒ Equ and 49 Cam

uvby FCAPT photometry of the mCP stars HD 32633, $\mathsf{\theta}$ Aur, 49 Cam, and 3 Hya

The complex magnetic field topology of the cool Ap star 49 Cam

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