Catalogue of Ap, HgMn and Am stars

Renson, Pierre; Manfroid, Jean

doi:10.1051/0004-6361/200810788

Cited by 375 publications

(496 citation statements)

References 26 publications

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“…HD 42659 (HIP 29365, BD-15 1299, UV Lep) is classified as A3 Sr Cr Eu star in the catalogue from Renson & Manfroid (2009). Its visual magnitude is given as V = 6.75 ± 0.01 (Høg et al 2000).…”

Section: Stellar Properties Of Hd 42659mentioning

confidence: 99%

A radial-velocity survey of Ap stars with HARPS

Hartmann

Hatzes

2015

A&A

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Context. Chemically peculiar Ap stars are main-sequence stars of spectral type B8-F3 which show large overabundances of some chemical elements (e.g., Si, Sr, Cr), especially of rare-earth elements, compared to normal A-type stars. Furthermore, they have strong, global magnetic fields and low rotational velocities. Some Ap stars exhibit high-overtone, low-degree, non-radial p-mode pulsations with periods of 6-24 min and are called rapidly oscillating Ap (roAp) stars. Interestingly, no roAp star is known to be a spectroscopic binary (SB), while many non-oscillating Ap (noAp) stars are found in SB systems. Aims. The goal of this survey was to carry out a systematic search for sub-stellar and stellar companions around Ap stars. Methods. Between 2004 and 2009, we observed 65 chemically peculiar stars with the HARPS spectrograph at the 3.6-m telescope at the European Southern Observatory (La Silla, Chile). The radial-velocity (RV) measurements were obtained using a new software called HARPS-TERRA which is based on a least-squares matching of each individual spectrum to a high signal-to-noise ratio template for each star. Results. We find significant variability with a period of 93.2 days and a semi-amplitude of 11.85 km s −1 in the RVs of HD 42659, a star of our sample that belongs to the group of roAp stars. This variability is caused by a stellar companion with a minimum mass of 0.47 M in a slightly eccentric (e = 0.146) orbit at a separation of 0.55 AU.Conclusions. This detection makes HD 42659 the first confirmed SB around a roAp star in a relatively close orbit. It shows that tidal interactions in binaries do not necessarily inhibit pulsations in Ap stars.

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Section: Stellar Properties Of Hd 42659mentioning

confidence: 99%

A radial-velocity survey of Ap stars with HARPS

Hartmann

Hatzes

2015

A&A

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“…Bychkov et al (2009) listed upper limits of the magnetic fields for these objects of 89 G and 49 G, respectively. They list a spectral classification of B8 Si, taken from Renson & Manfroid (2009), for HD 52965 which is probably wrong. The only found reference in this respect is from Young & Martin (1973) which lists "B9 p: Si ii (4128/4130) slightly enhanced".…”

Section: Ngc 2323mentioning

confidence: 99%

“…There are two CP stars listed in the catalogue by Renson & Manfroid (2009), namely HD 13402 (W34) and HD 13412 (CP1, W31). The first star is a high-mass supergiant (B0.5Iab) with a very small proper motion and is probably misclassified (Skiff 2013).…”

Section: Stockmentioning

confidence: 99%

Photoelectric search for peculiar stars in open clusters

Paunzen

Netopil

Maitzen³

et al. 2014

A&A

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Context. The chemically peculiar (CP) stars of the upper main sequence are mainly characterized by strong overabundances of heavy elements. Two subgroups (CP2 and CP4) have strong local magnetic fields which make them interesting targets for astrophysical studies. This star group, in general, is often used for the analysis of stellar formation and evolution in the context of diffusion as well as meridional circulation. Aims. In continuation of a long term study of CP stars (initiated in the 1980s), we present new results based on photoelectric measurements for ten open clusters that are, with one exception, younger than 235 Myr. Observations in star clusters are favourable because they represent samples of stars of constant age and homogeneous chemical composition. Methods. The very efficient tool of Δa photometry was applied. It samples the flux depression at 5200 Å typically for CP stars. In addition, it is able to trace emission line Be/Ae and λ Bootis stars. Virtually all CP2 and CP4 stars can be detected via this tool, and it has been successfully applied even in the Large Magellanic Cloud. For all targets in the cluster areas, we performed a kinematic membership analysis. Results. We obtained new photoelectric Δa photometry of 304 stars from which 207 objects have a membership probability higher than 50%. Our search for chemically peculiar objects results in fifteen detections. The stars have masses between 1.7 M and 7.7 M and are between the zero-and terminal-age-main-sequence. We discuss the published spectral classifications in the light of our Δa photometry and identify several misclassified CP stars. We are also able to establish and support the nature of known bona fide CP candidates. Conclusions. It is vital to use kinematic data for the membership determination and also to compare published spectral types with other data, such as Δa photometry. There are no doubts about the accuracy of photoelectric measurements, especially for stars brighter than 10th magnitude. The new and confirmed CP stars are interesting targets for spectroscopic follow-up observations to put constraints on the formation and evolution of CP stars.

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“…Landstreet & Borra 1978;Borra & Landstreet 1979;Bohlender 1988;Bagnulo et al 2006;Hubrig et al 2015), pointing out Hestrong stars as a sub-class of strong magnetic early B-type stars. Within the context of the "B fields in OB stars" (BOB) collaboration (Morel et al 2014(Morel et al , 2015Hubrig et al 2014aHubrig et al , 2015Fossati et al 2015b;Schöller et al 2017), here we report the detection of an exceptionally strong magnetic field in the He-strong B2IV star CPD −62 • 2124 (V = 11.04 mag ;Drilling 1981;Walborn 1983;Zboril et al 1997;Renson & Manfroid 2009). The star was observed using two different instruments (Sect.…”

Section: Introductionmentioning

confidence: 61%

B field in OB stars (BOB): The outstandingly strong magnetic field in the evolved He-strong star CPD −62° 2124

Castro

Fossati

Hubrig

et al. 2017

A&A

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The origin and evolution of magnetism in OB stars is far from being well understood. With approximately 70 magnetic OB stars known, any new object with unusual characteristics may turn out to be a key piece of the puzzle. We report the detection of an exceptionally strong magnetic field in the He-strong B2IV star CPD −62 • 2124. Spectropolarimetric FORS2 and HARPSpol observations were analysed by two independent teams and procedures, concluding on a strong longitudinal magnetic field of approximately 5.2 kG. The quantitative characterisation of the stellar atmosphere yields an effective temperature of 23 650 ± 250 K, a surface gravity of 3.95 ± 0.10 dex and a surface helium fraction of 0.35 ± 0.02 by number. The metal composition is in agreement with the cosmic abundance standard, except for Mg, Si and S, which are slightly non-solar. The strong and broad (∼300 km s −1 ) disc-like emission displayed by the Hα line suggests a centrifugal magnetosphere supported by the strong magnetic field. Our results imply that CPD −62 • 2124 is an early B-type star hosting one of the strongest magnetic fields discovered to date, and one of the most evolved He-strong stars known, with a fractional main-sequence lifetime of approximately 0.6.

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Catalogue of Ap, HgMn and Am stars

Abstract: We present a catalogue of 8205 known or suspected Ap, HgMn and Am stars. This paper is a major update of our first edition of the catalog of Ap and Am stars and includes revised identifications, additional stars and revised information obtained from the literature.

Cited by 375 publications

References 26 publications

A radial-velocity survey of Ap stars with HARPS

A radial-velocity survey of Ap stars with HARPS

Photoelectric search for peculiar stars in open clusters

B field in OB stars (BOB): The outstandingly strong magnetic field in the evolved He-strong star CPD −62° 2124

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