Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/J/AJ/128/1324
- Title:
- Properties of the eclipsing binary star V885 Cyg
- Short Name:
- J/AJ/128/1324
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present 4179 differential observations in the V filter measured by a robotic telescope, as well as 25 pairs of radial velocities from high-resolution spectroscopic observations, of the detached, EB-type, 1.69day period double-lined eclipsing binary star V885 Cyg.
- ID:
- ivo://CDS.VizieR/J/AJ/130/794
- Title:
- Radial velocities and BV photometry of HD 144110
- Short Name:
- J/AJ/130/794
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- New spectroscopic and photometric observations of HD 144110 have been used to obtain an improved orbital element solution and determine some basic properties of the system. This chromospherically active, double-lined spectroscopic binary has an orbital period of 1.6714012days and a circular orbit. We classify the components as G5 V and K0 V and suggest that they are slightly metal-rich. The photometric observations indicate that the rotation of HD 144110 is synchronous with the orbital period. Despite the short orbital period, no evidence of eclipses is seen in our photometry.
- ID:
- ivo://CDS.VizieR/J/AJ/131/1702
- Title:
- Radial velocities for the HD 27638B components
- Short Name:
- J/AJ/131/1702
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report spectroscopic observations of HD 27638B, the secondary in a visual binary in which the physically associated primary (separation ~19") is a B9 V star. The secondary shows strong Li{lambda}6708 absorption, suggesting youth, and has attracted attention in the past as a candidate post-T Tauri star, although this has subsequently been ruled out. It was previously known to be a double-lined spectroscopic binary (F8+G6) with a period of 17.6days and to show velocity residuals indicating a more distant massive third companion with a period of at least 8yr.
- ID:
- ivo://CDS.VizieR/J/AJ/151/106
- Title:
- Radial velocities in 2006-2014 for HD 89758
- Short Name:
- J/AJ/151/106
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report that the spectroscopic binary {mu} Ursae Majoris ({mu} UMa) has secondary RV variations of 471.2 days in addition to those of 230.0 days already known. Keplerian orbit analysis yields stellar mass companions of 1.6M_{sun}_ for the 230 day period and 0.14M_{sun}_for the 471 day period. However, the HIPPARCOS photometries show a period similar to the stellar rotational period, which is one-quarter of the RV period. Variations in the bisector velocity curvature show a period of 463.6 days. We also find ~473 day variations in the equivalent width (EW) measurements of the H_{alpha}_ and H_{beta}_ lines, whose origin is probably stellar activity. We note that the nature of 471 day variations is similar to one observed in "Sequence D" of Asymptotic Giant Branch pulsating stars. We therefore conclude that the RV and the EW variations in the spectroscopic binary M giant {mu} UMa A originate from the complex pulsations and the chromospheric activity.
- ID:
- ivo://CDS.VizieR/J/AJ/150/97
- Title:
- Radial velocities in M67. I. 1278 candidate members
- Short Name:
- J/AJ/150/97
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present results from 13776 radial-velocity (RV) measurements of 1278 candidate members of the old (4Gyr) open cluster M67 (NGC 2682). The measurements are the results of a long-term survey that includes data from seven telescopes with observations for some stars spanning over 40years. For narrow-lined stars, RVs are measured with precisions ranging from about 0.1 to 0.8km/s. The combined stellar sample reaches from the brightest giants in the cluster down to about 4mag below the main-sequence turnoff (V=16.5), covering a mass range of about 1.34M_{sun}_ to 0.76M_{sun}_. Spatially, the sample extends to a radius of 30arcmin (7.4pc in projection at a distance of 850pc or 6-7 core radii). We find M67 to have a mean radial velocity of +33.64km/s (with an internal precision of +/-0.03km/s) well separated from the mean velocity of the field. For stars with >=3 measurements, we derive RV membership probabilities and identify RV variables, finding 562 cluster members, 142 of which show significant RV variability. We use these cluster members to construct a color-magnitude diagram and identify a rich sample of stars that lie far from the standard single star isochrone, including the well-known blue stragglers, sub-subgiants and yellow giants. These exotic stars have a binary frequency of (at least) 80%, more than three times that detected for stars in the remainder of the sample. We confirm that the cluster is mass segregated, finding the binaries to be more centrally concentrated than the single stars in our sample at the 99.8% confidence level (and at the 98.7% confidence level when only considering main-sequence stars). The blue stragglers are centrally concentrated as compared to the solar-type main-sequence single stars in the cluster at the 99.7% confidence level. Accounting for measurement precision, we derive an RV dispersion in M67 of 0.80+/-0.04km/s for our sample of single main-sequence stars, subgiants and giants with V{<=}15.5. When corrected for undetected binaries, this sample yields a true RV dispersion of 0.59_-0.06_^+0.07^km/s. The radial distribution of the velocity dispersion is consistent with an isothermal distribution within our stellar sample. Using the cluster RV dispersion, we estimate a virial mass for the cluster of 2100_-550_^+610^M_{sun}_.
- ID:
- ivo://CDS.VizieR/J/AJ/139/1383
- Title:
- Radial velocities in M35 (NGC 2168)
- Short Name:
- J/AJ/139/1383
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present 5201 radial-velocity (RV) measurements of 1144 stars as part of an ongoing study of the young (150Myr) open cluster M35 (NGC 2168). We have observed M35 since 1997, using the Hydra Multi-Object Spectrograph on the WIYN 3.5m telescope.
- ID:
- ivo://CDS.VizieR/J/ApJ/639/1069
- Title:
- Radial velocities in the Cas OB6 association
- Short Name:
- J/ApJ/639/1069
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of time-resolved spectroscopy of 13 O-type stars in the Cas OB6 stellar association. We conducted a survey for radial velocity variability in search of binary systems, which are expected to be plentiful in young OB associations.
- ID:
- ivo://CDS.VizieR/J/A+A/528/A127
- Title:
- Radial velocities in the globular NGC 2808
- Short Name:
- J/A+A/528/A127
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The formation mechanism of hot horizontal branch (HB) stars is still one of the most uncertain points of stellar evolution theories. In the past decade, models based on their binary origin have been very successful in reproducing the properties of field subdwarf-B stars, but the observations of their analogues in globular clusters has posed new problems. In addition, the discovery of multiple populations offered an appealing alternative scenario for the formation of these stars. We search for binaries of period P<=200days among a sample of 83 blue horizontal branch stars (Teff=12000-22000K) in NGC 2808, a cluster known to host three distinct stellar populations and a multimodal horizontal branch. The final sample, after the rejection of stars with incomplete observations or poor quality data, consists of 64 targets. The radial velocity of the targets was measured in fourteen epochs, spanning a temporal interval of ~75days. The significant variations were identified by means of a detailed error analysis and a statistical study.
- 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.
