Spectroscopic study of early-type multiple stellar systems

Veramendi, M. E.; González, J. F.

doi:10.1051/0004-6361/201322840

Cited by 3 publications

(1 citation statement)

References 47 publications

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“…However, the observational results published in the literature on systems with early-type components are insufficient, both in quantity and detail, to establish overall conclusions on the frequency and properties of this type of systems (see Veramendi & González 2014, hereafter Paper I, and references therein). For that reason, we carried out a spectroscopic investigation of a sample of 30 systems with catalogued components with types O, B, and A, selected from the Multiple Star Catalogue (MSC; Tokovinin 1997).…”

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confidence: 99%

Spectroscopic study of early-type multiple stellar systems

Veramendi

González

2014

A&A

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Context. This work is part of a long-term spectroscopic study of a sample of 30 multiple stars with early-type components. In this second paper we present the results for six multiple systems in which new stellar components have been detected. Aims. The main aim is to increase the knowledge of stellar properties and dynamical structure of early-type multiple stellar systems. Methods. Using spectroscopic observations taken over a time baseline of more than five years we measured radial velocities by crosscorrelations and spectrally separated the double-lined systems. In addition to the discovery of objects with double-lined spectra, the existence of new spectroscopic subsystems were inferred from the radial velocity variations of single-lined components and through the variation of the barycentric velocity of double-lined subsystems. Orbital elements were calculated when possible. Results. Seven new stellar components and two members that we expect to confirm with new observations have been discovered in the six studied multiples. We present orbital parameters for two double-lined binaries and preliminary orbits for three single-lined spectroscopic binaries. Five of the six analysed systems are quadruples, while the remaining has five components distributed on four hierarchical levels. These multiplicity orders are in fact lower limits, since these systems lack high-resolution visual observations and additional hierarchical levels might exist in that separation range. Conclusions. The six analysed systems have a higher degree of multiplicity and a more complex hierarchical structure than previously known, which suggests that high-order multiple systems are significantly more frequent than currently estimated. The long-term spectroscopic monitoring of multiple systems has shown to be useful for the detection of companions in intermediate hierarchical levels.

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Section: Introductionmentioning

confidence: 99%

Spectroscopic study of early-type multiple stellar systems

Veramendi

González

2014

A&A

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The two eccentric eclipsing binaries in multiple systems: V539 Arae and V335 Serpentis

et al. 2022

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Discovery of new mercury–manganese stars, including a fast rotator

González

Nuñez

Saffe

et al. 2021

Monthly Notices of the Royal Astronomical Society

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The origin of mercury–manganese (HgMn) stars is still poorly understood and the statistical analysis of an extensive sample of well characterized objects would be very valuable. Nevertheless, the compilation of a clean and reliable list of all known HgMn stars, and complete characterization of those objects, is still a pending issue. We report the identification of 13 new HgMn stars from our own spectroscopic observations and from publicly available spectral libraries. In addition, we perform a thorough literature search to give a list of 46 confirmed HgMn stars (plus a further nine suspected HgMn stars) discovered over the last years or neglected by other compilations. When required, we performed specific observations to confirm doubtful cases. For the 13 newly identified HgMn stars we derived photospheric chemical abundances by spectral synthesis. Besides Hg and Mn, which are overabundant in the whole sample, P, Ga, and Xe are overabundant in the hottest stars of the sample, and Sr, Zr, and Pt among the coolest; Y is present in most stars of the sample. Three of these new HgMn stars are members of open clusters: HD 93549 in IC 2602, HD 96473 in NGC 3532, and HD 322659 in NGC 6281. Furthermore, our sample includes HD 145842, an object remarkable for its high rotation. In fact, its projected rotational velocity of ve sin i = 124 km s−1 is the highest measured in any HgMn star and is more than 30 per cent above the theoretical limit predicted by the diffusion theory, which makes HD 145842 a challenging test case for the current models.

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Spectroscopic study of early-type multiple stellar systems

Cited by 3 publications

References 47 publications

Spectroscopic study of early-type multiple stellar systems

Spectroscopic study of early-type multiple stellar systems

The two eccentric eclipsing binaries in multiple systems: V539 Arae and V335 Serpentis

Discovery of new mercury–manganese stars, including a fast rotator

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