Radial 
velocities

Grenier, S.; Baylac, M.-O.; Rolland, L.; Burnage, R.; Arenou, Frédéric; Briot, Danielle; Delmas, F.; Duflot, M.; Genty, V.; Gómez, A.; Halbwachs, J. L.; Marouard, M.; Oblak, E.; Sellier, A.

doi:10.1051/aas:1999489

Cited by 124 publications

(130 citation statements)

References 10 publications

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“…Target selection 32 targets from the HIPPARCOS catalogue have been selected according to the following criteria: 1) brighter than magnitude 8; 2) spectral type ranging from A0 to F2; 3) showing some indication of radial velocity variability (Grenier et al 1999); and 4) preferentially with less than ten references in the bibliography recorded in the SIMBAD database at the CDS. The selected targets are ordered by increasing HD number in Table 1, with the HIP number (Col. 2), number of references in SIMBAD (Col. 3), V magnitude (Col. 4) and spectral type (Col. 5) from Grenier et al (1999).…”

Section: Observations and Data Reductionmentioning

confidence: 99%

“…In their catalogue of stellar radial velocities, Grenier et al (1999) noticed that 32% of the sample of B8-F2 type stars observed by the Hipparcos satellite have variable velocities and assumed that this variability was due to multiplicity only. Though this conclusion remains valid when performing statistics on the overall occurrence of multiplicity, it is realistic to think that some of the studied stars are also non-radial pulsators showing line profile variations (LPVs).…”

Section: Introductionmentioning

confidence: 99%

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Search for pulsation among suspected A-type binaries and the new multiperiodic δ Scuti star HD 217860

Frémat

Lampens

Cauteren

et al. 2007

A&A

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Context. In the H-R diagram, the intersection of the main sequence and the classical Cepheid instability strip corresponds to a domain where a rich variety of atmospheric phenomena are at play (including pulsation, radiative diffusion, convection). Main-sequence A-type stars are among the best candidates to study the complex interplay between these various phenomena. Aims. We have explored a sample of suspected A-type binaries in a systematic way, both spectroscopically and photometrically. The sample consists of main-sequence A-type stars for which the few existing radial velocity measurements may show variability, but for which other essential information is lacking. Due to their location in the H-R diagram, indications of pulsation and/or chemical peculiarities among these suspected binary (or multiple) systems may be found. Methods. High-resolution spectroscopy obtained with the ELODIE and MUSICOS spectrographs was used in combination with a few nights of differential CCD photometry in order to search for pulsation(s). In order to search as well for chemical peculiarities or for possible hidden component(s), we derived the atmospheric stellar parameters by fitting the observed spectra with LTE synthetic ones. Results. Of the 32 investigated targets, eight are spectroscopic binaries, one of which is a close binary also showing eclipses, and three have been identified as δ Scuti pulsators with rapid line-profile variations. Conclusions. Among the latter stars, HD 217860 reveals interesting multiperiodic photometric and spectroscopic variations, with up to eight frequencies common to two large photometric data sets. We suggest that at least one radial overtone mode is excited among the two most dominant frequencies, on the basis of the computation of the pulsation constants as well as of the predicted frequencies and the expected behaviour of the amplitude ratio and the phase difference in two passbands using adequate theoretical modelling. We furthermore found evidence for a strong modulation of the amplitude(s) and/or the (radial) frequency content of this intriguing δ Scuti star.

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Section: Observations and Data Reductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Search for pulsation among suspected A-type binaries and the new multiperiodic δ Scuti star HD 217860

Frémat

Lampens

Cauteren

et al. 2007

A&A

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“…Enfin, les vitesses radiales obtenues par Fehrenbach et sonéquipe (Fehrenbach et al 1987)à l'aide du spectrographe Marly ontété améliorées par la mesure de nouveaux clichés obtenus au même spectrographe (Grenier et al 1999). Nous avons donc introduit ces nouveaux résultatsà la place des anciens, mais nous n'avons pas pris en compte les résultats concernant leś etoiles ne figurant pas dans la première publication.…”

Section: Origine Des Vitesses Radiales Utiliséesunclassified

Catalogue général de vitesses radiales moyennes pour les étoiles galactiques

Barbier-Brossat¹,

Figon²

2000

Astron. Astrophys. Suppl. Ser.

193

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Abstract. We present a catalogue of mean radial velocities for Galactic stars which supplements the catalogue WEB (Duflot et al. 1995) with observations published through december 1990. The catalogue contains new mean velocities for 20574 stars. Only observations obtained with adequate spectral resolution and standardized to the IAU or Wilson (1953) velocity systems have been used. Entries in the WEB mean radial velocities catalogue have been taken to represent the mean of all earlier measurements, to which the new data have been combined. The sources of new data are referenced. To make the work of users easier, we have included in our catalogue the results of the catalogue WEB, with agreement of the author.

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“…In the older literature spectral types A2 V (Osawa 1959;Eggen 1960) and A2 IV (Cowley et al 1969) can be found, whereas Abt & Morell (1995) or Grenier et al (1999) give A2 III. Therefore, in Table 4 we have calculated the eclipse parameters for two models which fulfill the mass function: one with A2 V + K7 V, the other with A2 III + K3 V. The masses, radii and semi-major axis a are expressed in corresponding solar units, and the minimum distance of both components a min = (1−e) a in radii of the primary.…”

Section: Resultsmentioning

confidence: 94%

HD 169981 -an overlooked photometric binary?

Lehmann¹,

Hildebrandt²,

Panov³

et al. 2001

A&A

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Abstract. In 1999 and 2000 we obtained spectroscopic and photometric observations of the A-type binary star HD 169981. The observations were part of a campaign to search for short-term photometric and radial-velocity variations among early-type binaries. From the radial velocities of 18 metal lines we derived more precise orbital elements. Quite unexpectedly, our photometric data show a dip that could be caused by an eclipse. The same feature is also visible in the Hipparcos data. From our analysis of the available observations we have estimated the physical parameters of the binary. Neither the spectroscopic nor the photometric observations hint at any short-term variations.

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Radial velocities

Cited by 124 publications

References 10 publications

Search for pulsation among suspected A-type binaries and the new multiperiodic δ Scuti star HD 217860

Search for pulsation among suspected A-type binaries and the new multiperiodic δ Scuti star HD 217860

Catalogue général de vitesses radiales moyennes pour les étoiles galactiques

HD 169981 -an overlooked photometric binary?

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