- ID:
- ivo://CDS.VizieR/J/A+A/469/861
- Title:
- Radial velocities of A115 galaxies
- Short Name:
- J/A+A/469/861
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of a new spectroscopic and photometric survey of the hot, binary X-ray cluster A115 at z=0.193, containing a radio relic. Our analysis is based on new spectroscopic data obtained at the Telescopio Nazionale Galileo for 115 galaxies and on new photometric data obtained at the Isaac Newton Telescope in a large field. We combine galaxy velocity and position information to select 85 galaxies recognized as cluster members, determine global dynamical properties and detect substructures.
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Search Results
- ID:
- ivo://CDS.VizieR/J/A+A/416/839
- Title:
- Radial velocities of A2219 galaxies
- Short Name:
- J/A+A/416/839
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of the dynamical analysis of the rich, hot, and X-ray very luminous galaxy cluster A2219, containing a powerful diffuse radio-halo. Our analysis is based on new redshift data for 27 galaxies in the cluster region, measured from spectra obtained at the Telescopio Nazionale Galileo (TNG), with the addition of other 105 galaxies recovered from reduction of CFHT archive data in a cluster region of about 5-arcmin radius (about 0.8Mpc/h at the cluster distance) centered on the cD galaxy. The investigation of the dynamical status is also performed by using X-ray data stored in the Chandra archive. Further, valuable information comes from other bands - optical photometric, infrared, and radio data - which are analyzed and/or discussed, too. Our analyses support the view of the connection between extended radio emission and merging phenomena in galaxy clusters.
- ID:
- ivo://CDS.VizieR/J/A+A/488/409
- Title:
- Radial velocities of {alpha} Per stars
- Short Name:
- J/A+A/488/409
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The Alpha Persei open cluster (Melotte 20) is one of the nearby clusters (d<500pc) for which a long-term systematic radial-velocity monitoring of the solar-type stars has not been published so far. We undertook an observing program in 1982 to study the membership, duplicity, and rotation of the main-sequence stars and to compare the results with those of the other nearby clusters. Radial-velocity observations of 60 solar-type stars in Mel 20 were obtained with CORAVEL, and of 44 fainter stars with ELODIE spectrographs, in the magnitude range 9.5<V<13.85 The membership of 37 stars from the list compiled by Heckmann is confirmed according to their proper motions, radial velocities, and photometry. We discovered twelve spectroscopic binaries (3 double-lined, 8 single-lined, 1 suspected) among the members and determined an orbit for the double-lined binary He 848. The observed frequency of spectroscopic binaries is therefore 32% (12/37). Four stars are photometric binaries. In addition, the membership of 33 stars with AP numbers is supported by the present radial velocities. Two single-lined and three double-lined binaries were detected in this sample. The cluster mean radial velocity is -1.39+/-0.17km/s based on 18 stars within 2{sigma}. We found a systematic difference of 3.67+/-1.48km/s between observed- and astrometric radial velocities. The Alpha Persei cluster members define a tight main sequence in the colour-magnitude diagrams. The remaining scatter observed in the colour- magnitude diagrams and in radial velocities may be due to the difficulty of separating the core Alpha Persei stars from the extended comoving stream.
- ID:
- ivo://CDS.VizieR/J/AJ/149/49
- Title:
- Radial velocities of AW UMa
- Short Name:
- J/AJ/149/49
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- High-resolution spectroscopic observations of AW UMa, obtained on three consecutive nights with a median time resolution of 2.1minutes, have been analyzed using the broadening function method in the spectral window of 22.75nm around the 518nm MgI triplet region. Doppler images of the system reveal the presence of vigorous mass motions within the binary system; their presence puts into question the solid-body rotation assumption of the contact binary model. AW UMa appears to be a very tight, semi-detached binary; the mass transfer takes place from the more massive to the less massive component. The primary, a fast-rotating star with Vsini=181.4+/-2.5km/s, is covered with inhomogeneities: very slowly drifting spots and a dense network of ripples more closely participating in its rotation. The spectral lines of the primary show an additional broadening component (called the "pedestal") that originates either in the equatorial regions, which rotate faster than the rest of the star by about 50km/s, or in an external disk-like structure. The secondary component appears to be smaller than predicted by the contact model. The radial velocity field around the secondary is dominated by accretion of matter transferred from (and possibly partly returned to) the primary component. The parameters of the binary are Asini=2.73+/-0.11R_{sun}_ and M_1_sin^3^i=1.29+/-0.15M_{sun}_, M_2_sin^3^i=0.128+/-0.016M_{sun}_. The mass ratio, q_sp_=M_2_/M_1_=0.099+/-0.003, while still the most uncertain among the spectroscopic elements, is substantially different from the previous numerous and mutually consistent photometric investigations which were based on the contact model. It should be studied why photometry and spectroscopy give such discrepant results and whether AW UMa is an unusual object or if only very high-quality spectroscopy can reveal the true nature of W UMa-type binaries.
- ID:
- ivo://CDS.VizieR/III/273
- Title:
- Radial velocities of 107 B8-A0 stars
- Short Name:
- III/273
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The observations of radial velocities of B8-A0 stars were produced in 1932-1937 with one-prism spectrograph and short camera giving a dispersion of 75{AA}/mm at H{gamma}. When reducing the observations the systematic error as described in our previous paper (I) has been taken into account. From the comparison of the radial velocities of 7 stars in common with two catalogues the systematic correction to our radial velocities was deduced, viz.+0.44+/-1.51km/s in the sense Moore-Simeis. In table XII there are given the final radial velocities for 91 stars with mean value of p.e. equal to +/-3.57km/s. In table XII are given observed velocities for 16 stars with variable radial velocities. Very large velocity of the star HD 161817 leads to the conclusion that this star belongs to the class of high-velocity stars.
- ID:
- ivo://CDS.VizieR/J/A+A/512/A46
- Title:
- Radial velocities of BD-08 2823
- Short Name:
- J/A+A/512/A46
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report the detection of a planetary system around BD-08 2823, that includes at least one Uranus-mass planet and one Saturnmass planet. This discovery serendipitously originates from a search for planetary transits in the Hipparcos photometry database. This program preferentially selected active stars and did not allow the detection of new transiting planets. It allowed however the identification of the K3V star BD-08 2823 as a target harboring a multiplanet system, that we secured and characterized thanks to an intensive monitoring with the HARPS spectrograph at the 3.6-m ESO telescope in La Silla. The stellar activity level of BD-08 2823 complicates the analysis but does not prohibit the detection of two planets around this star. BD-08 2823b has a minimum mass of 14.4+/-2.1M_{earth}_ and an orbital period of 5.60days, whereas BD-08 2823c has a minimum mass of 0.33+/-0.03M_{Jup}_ and an orbital period of 237.6days. This new system strengthens the fact that low-mass planets are preferentially found in multiplanetary systems, but not around high-metallicity stars as this is the case for massive planets. It also supports the belief that active stars should not be neglected in exoplanet searches, even when searching for low-mass planets.
- ID:
- ivo://CDS.VizieR/J/A+A/512/A45
- Title:
- Radial velocities of BD+20 1790
- Short Name:
- J/A+A/512/A45
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- BD+20 1790 is a young active, metal-rich, late-type K5Ve star. We have undertaken a study of stellar activity and kinematics for this star over the past few years. Previous results show a high level of stellar activity, with the presence of prominence-like structures, spots on the surface, and strong flare events, despite the moderate rotational velocity of the star. In addition, radial velocity variations with a semi-amplitude of up to 1km/s were detected. We investigate the nature of these radial velocity variations, in order to determine whether they are due to stellar activity or the reflex motion of the star induced by a companion.
- ID:
- ivo://CDS.VizieR/J/A+A/496/441
- Title:
- Radial velocities of Berkeley 32 stars
- Short Name:
- J/A+A/496/441
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Measurements of lithium (Li) abundances in open clusters provide a unique tool for following the evolution of this element with age, metallicity, and stellar mass. In spite of the plethora of Li data already available, the behavior of Li in solar-type stars has so far been poorly understood. Using FLAMES/Giraffe on the VLT, we obtained spectra of 157 candidate members of the old, metal-poor cluster Berkeley 32, to determine membership and to study the Li behavior of confirmed members. Radial velocities were measured, allowing us to derive both the cluster velocity and membership information for the sample stars. The Li abundances were obtained from the equivalent width of the Li I 670.8nm feature, using curves of growth.
- ID:
- ivo://CDS.VizieR/J/A+A/455/259
- Title:
- Radial velocities of beta Cep
- Short Name:
- J/A+A/455/259
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the radial-velocity data of both components of the double-lined spectroscopic binary Beta Centauri, whose lines are blended throughout the orbit. The radial-velocity values were obtained from detailed iteration schemes involving spectral disentangling outlined in the paper.
- ID:
- ivo://CDS.VizieR/J/A+A/454/301
- Title:
- Radial velocities of 6 binaries
- Short Name:
- J/A+A/454/301
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Radial velocity measurements of the two components of three new discovered SB2 systems, HD183957, BD+15 4538, and BD+33 4462, have been obtained from optical spectra acquired with both ELODIE and AURELIE spectrographs at the Observatoire de Haute-Provence (OHP) and FRESCO spectrograph at the Osservatorio Astrofisico di Catania (OAC) by means of the cross-correlation technique (Tables 2-4). Radial velocities of three new discovered SB1 systems, HD 237215, HD 57267, and BD+38 2140, obtained with the same instruments are reported in Tables 5-7.
