- ID:
- ivo://CDS.VizieR/J/MNRAS/356/545
- Title:
- Radial velocities of DG Leo
- Short Name:
- J/MNRAS/356/545
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- DG Leo is a spectroscopic triple system composed of three stars of late-A spectral type, one of which was suggested to be a delta Scuti star. Seven nights of observations at high spectral and high time-resolution at the Observatoire de Haute-Provence with the ELODIE spectrograph were used to obtain the component spectra by applying a Fourier transform spectral disentangling technique. Comparing these with synthetic spectra, the stellar fundamental parameters (effective temperature, surface gravity, projected rotation velocity and chemical composition) are derived. The inner binary consists of two Am components, at least one of which is not yet rotating synchronously at the orbital period though the orbit is a circular one. The distant third component is confirmed to be a delta Scuti star with normal chemical composition.
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- ID:
- ivo://CDS.VizieR/J/AJ/137/3100
- Title:
- Radial velocities of 4 dSph galaxies
- Short Name:
- J/AJ/137/3100
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present spectroscopic data for individual stars observed from 2004 March through 2008 August as part of our Michigan/MIKE Fiber System (MMFS) survey of four dwarf spheroidal (dSph) galaxies: Carina, Fornax, Sculptor, and Sextans. Using MMFS at the Magellan/Clay Telescope at Las Campanas Observatory, we have acquired 8855 spectra from 7103 red-giant candidates in these Galactic satellites. We list measurements of each star's line-of-sight velocity (median error +/-2.1km/s) and spectral line indices for iron and magnesium absorption features.
- ID:
- ivo://CDS.VizieR/J/A+A/461/1077
- Title:
- Radial velocities of DW Car
- Short Name:
- J/A+A/461/1077
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have studied the high-mass short-period detached eclipsing binary DW Carinae using high-resolution echelle spectroscopy and photoelectric Stroemgren uvby light curves. We derived masses and radii accurate to 1% as well as the effective temperatures and reddening of the system. The high rotational velocities of the component stars meant that blending was a major problem when deriving radial velocities from the spectroscopy. Only helium lines provided good results, and a critique of different methods of measurement showed that spectral disentangling and fitting double Gaussians showed that these were the best able to provide reliable results in this case. The final spectroscopic orbit was calculated using spectral disentangling but we also provided radial velocities by fitting double Gaussians to the He-I 4472-A spectral line in each spectrum as this gives a good idea as to the quality of the data whilst providing a result very close to that adopted to calculate the masses. The light curves of DW Car are published as part of an accompanying paper (Clausen et al., 2006, Cat. <J/A+A/461/1065>).
- ID:
- ivo://CDS.VizieR/J/A+A/649/A109
- Title:
- Radial velocities of 4 eclipsing binaries
- Short Name:
- J/A+A/649/A109
- Date:
- 16 Mar 2022 00:18:30
- Publisher:
- CDS
- Description:
- The surface brightness-colour relation (SBCR) is a basic tool for establishing precise and accurate distances within the Local Group. Detached eclipsing binary stars with accurately determined radii and trigonometric parallaxes allow calibration of the SBCRs with unprecedented accuracy. We analysed four nearby eclipsing binary stars containing late F-type main sequence components: AL Ari, AL Dor, FM Leo, and BN Scl. We determined very precise spectroscopic orbits and combined them with high-precision ground- and space-based photometry. We derived the astrophysical parameters of their components with mean errors of 0.1% for mass and 0.4% for radius. We combined those four systems with another 24 nearby eclipsing binaries with accurately known radii from the literature for which Gaia EDR3 parallaxes are available in order to derive the SBCRs. The resulting SBCRs cover stellar spectral types from B9 V to G7 V. For calibrations, we used Johnson optical B and V , Gaia GBP and G, and 2MASS JHK bands. The most precise relations are calibrated using the infrared K band and allow angular diameters of A-, F-, and G-type dwarf and subgiant stars to be predicted with a precision of 1%
- ID:
- ivo://CDS.VizieR/J/A+A/387/850
- Title:
- Radial velocities of eclipsing binaries
- Short Name:
- J/A+A/387/850
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Spectroscopic orbits of the 12 eclipsing binary systems, TW And, CD And, RS Ari, RU Cnc, TW Cnc, UU Cnc, V788 Cyg, AW Her, MM Her, RV Lib, EW Ori and ZZ UMa are obtained from Coravel and Elodie radial velocity measurements. We obtain a first orbit for CD And, RS Ari, TW Cnc, and V788 Cyg. For the systems TW And, RU Cnc, UU Cnc, AW Her, MM Her, RV Lib, EW Ori and ZZ UMa, the new spectroscopic orbits are either better or of quality comparable to that previously published. The physical properties of these systems were estimated with the photometric parameters from available data except CD And, TW Cnc, UU Cnc, V788 Cyg and RV Lib for which we found a model compatible with the observations. The systems RU Cnc, AW Her, MM Her and RV Lib belong to RS CVn group. In general these systems were difficult to observe with Coravel, on the one hand because the stars are relatively weak and on the other hand because of nature of the components giving peaks of correlation with weak contrast.
- ID:
- ivo://CDS.VizieR/J/A+A/402/745
- Title:
- Radial velocities of ER Vul
- Short Name:
- J/A+A/402/745
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- ER Vul is an eclipsing binary consisting of two solar type stars in a very close orbit with a period of 0.7d. Accordingly, the two stars rotate very fast, leading to a blending of many spectral features at all phases. Therefore, measuring the radial velocity curve without systematic errors is not trivial. Here, we use a two-dimensional cross-correlation method applied to 137 high quality spectra, collected over 3 years, in order to obtain the radial velocity curve and determine the orbital and some physical parameters of the system from it. Primarily, we improve the binary period to 0.69809458d+/-0.00000014d, and find that the two amplitudes are slightly smaller than those measured by others, while the mass ratio is still similar. While at least the primary almost fills its Roche lobe, the system is still detached, i.e. not yet a fully fledged W UMa-system. The behaviour of the CaII IRT line at 8662{AA} confirms that the secondary is the more active component, and that the chromospheric emission is not symmetrically distributed over the surfaces of either star.
- ID:
- ivo://CDS.VizieR/J/A+A/613/A47
- Title:
- Radial velocities of 12 evolved stars
- Short Name:
- J/A+A/613/A47
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present radial velocities and line bisectors for 12 giants with high Li abundance. We report the discovery of two new planetary systems around HD238914 and TYC3318-01333-1, reveal a binary Li-rich giant HD181368. Although our current phase coverage is not complete, we suggest the presence of planetary mass companions around TYC3663-01966-1 and TYC3105-00152-1. We confirm the previous result for BD+48 740 (Adamow et al, 2012ApJ...754L..15A).
- ID:
- ivo://CDS.VizieR/J/A+A/427/313
- Title:
- Radial velocities of evolved stars. III.
- Short Name:
- J/A+A/427/313
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Rotational velocity measurements are presented for a sample of 78 double-lined binary systems with an evolved component. This work is the third part of the large survey carried out with the CORAVEL spectrometer to establish the behavior the rotation for stars evolving off the main sequence (De Medeiros & Mayor, 1999, Cat. <J/A+AS/139/433>; De Medeiros et al. 2002, Cat. <J/A+A/395/97>). Some of the stars show an orbital motion which require some further analysis; the corresponding results will be included in a forthcoming paper. The stars concerned are HD 5303, 82543, 169268, 172088 and 250810.
- ID:
- ivo://CDS.VizieR/J/MNRAS/472/4193
- Title:
- Radial velocities of 1453 FGK
- Short Name:
- J/MNRAS/472/4193
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the second paper of a series of publications aiming at obtaining a better understanding regarding the nature of type Ia supernovae (SN Ia) progenitors by studying a large sample of detached F, G and K main-sequence stars in close orbits with white dwarf companions (i.e. WD+FGK binaries). We employ the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) data release 4 spectroscopic data base together with Galaxy Evolution Explorer (GALEX) ultraviolet fluxes to identify 1549 WD+FGK binary candidates (1057 of which are new), thus doubling the number of known sources. We measure the radial velocities of 1453 of these binaries from the available LAMOST spectra and/or from spectra obtained by us at a wide variety of different telescopes around the globe. The analysis of the radial velocity data allows us to identify 24 systems displaying more than 3{sigma} radial velocity variation that we classify as close binaries. We also discuss the fraction of close binaries among WD+FGK systems, which we find to be ~10 per cent, and demonstrate that high-resolution spectroscopy is required to efficiently identify double-degenerate SN Ia progenitor candidates.
- ID:
- ivo://CDS.VizieR/J/ApJS/194/38
- Title:
- Radial velocities of 11 field RR Lyrae
- Short Name:
- J/ApJS/194/38
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present new radial velocities (RVs), improved pulsation periods, and reference epochs of 11 field RR Lyrae ab-type variables: AS Vir, BS Aps, CD Vel, DT Hya, RV Oct, TY Gru, UV Oct, V1645 Sgr, WY Ant, XZ Aps, and Z Mic. This study is based on high-resolution spectra obtained with the echelle spectrograph of the 2.5m du Pont telescope at Las Campanas Observatory. We obtained ~200 spectra per star (i.e., a total of ~2300 spectra), distributed more or less uniformly throughout their pulsation cycles. RV curves and photometric light curves phased to our new ephemerides are presented for all program stars.
