- ID:
- ivo://CDS.VizieR/J/AJ/142/46
- Title:
- Speckle interferometry at USNO. XVII.
- Short Name:
- J/AJ/142/46
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The results of 3362 intensified CCD observations of double stars, made with the 26 inch refractor of the U.S. Naval Observatory, are presented. Each observation of a system represents a combination of over 2000 short-exposure images. These observations are averaged into 1970 mean relative positions and range in separation from 0.78" to 72.17", with a mean separation of 14.76". This is the 17th in this series of papers and covers the period 2010 January 6 through December 20. Also presented are 10 pairs that are resolved for the first time.
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Search Results
- ID:
- ivo://CDS.VizieR/J/AJ/150/136
- Title:
- Speckle interferometry at USNO. XX.
- Short Name:
- J/AJ/150/136
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Results are presented of 4222 intensified CCD observations of double stars, made with the 26 inch refractor of the U.S. Naval Observatory in 2013 and 2014. These observations are averaged into 2335 mean relative positions and range in separation from 0.53'' to 83.90'', with a median separation of 11.42''. This is the 20th in this series of papers and covers the period 2013 January 4 through 2014 December 18. Also presented are 13 pairs which are measured for the first time, 12 pairs which appear to be lost, linear elements for 17 pairs, and orbital elements for five additional pairs. Finally, we investigated apparent systematic residuals to earlier measures in this series, and modify scale factors for closer pairs observed between 1990 and the present.
- ID:
- ivo://CDS.VizieR/J/AJ/153/20
- Title:
- Speckle interferometry at USNO. XXI.
- Short Name:
- J/AJ/153/20
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The results of 2408 intensified CCD observations of double stars, made with the 26 inch refractor of the U.S. Naval Observatory, are presented. Each observation of a system represents a combination of over 2000 short-exposure images. These observations are averaged into 1602 mean relative positions and range in separation from 1.94'' to 107.41'', with a median separation of 11.96''. This is the twenty-first in this series of papers and covers the period from 2015 January 13 through 2015 December 19. Significant instrumentation changes are reported in this paper.
- ID:
- ivo://CDS.VizieR/J/AJ/139/743
- Title:
- Speckle interferometry in 2008-09
- Short Name:
- J/AJ/139/743
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The results of speckle interferometric measurements of binary and multiple stars conducted in 2008 and 2009 at the Blanco and SOAR 4m telescopes in Chile are presented. A total of 1898 measurements of 1189 resolved pairs or sub-systems and 394 observations of 285 un-resolved targets are listed. We resolved for the first time 48 new pairs, 21 of which are new sub-systems in close visual multiple stars.
- ID:
- ivo://CDS.VizieR/J/AJ/150/16
- Title:
- Speckle-interferometry in Melotte 111
- Short Name:
- J/AJ/150/16
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a high-angular resolution survey for the search of binary and multiple stars in the Galactic open cluster Melotte 111. Combining our own speckle-interferometric observations with data taken from the literature, we found a ratio of the number of single to multiple stars to be 29:8:0:0:0:1 for the most probable members, indicating a multiplicity fraction for this cluster of 25.6%+/-2%. We also observed field stars in the vicinity of the cluster and estimated a ratio of multiplicities of 286:17:1:0:0:0:1 (between one and seven companions), equivalent to a multiplicity fraction of 5.9%+/-3%. We showed that the cumulative distribution of separations for our sample stars is in agreement with Opik's law.
- ID:
- ivo://CDS.VizieR/J/other/AstBu/67.44
- Title:
- Speckle interferometry of Ap stars
- Short Name:
- J/other/AstBu/67
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of speckle interferometry of a sample of 117 chemically peculiar stars with global magnetic fields. The observations were made in December 2009 at the BTA with a spatial resolution of about 0.02 arcseconds in the visual spectral region. Twenty-nine stars were resolved into individual components, 14 of them for the first time (HD965, HD5797, HD8855, HD10783, HD16605, HD21699, HD35502, HD51418, HD64486, HD79158, HD103498, HD108651, HD213918, HD293764). In twelve cases a companion turned out to be 2-4 magnitudes fainter than the main component - a magnetic star. Young hot Bp stars HD35502 and HD213918 are exceptions, since their companions are fainter by about 1 magnitude. In all cases, the linear distance from a star to its companion at the epoch of observations in the picture plane exceeded 10^9^km. Eighty-eight magnetic CP stars revealed no secondary components within our study. Thus, the fraction of speckle interferometric binaries in our sample amounts to 25%.
- ID:
- ivo://CDS.VizieR/J/other/AstBu/69.296
- Title:
- Speckle interferometry of Ap stars. II.
- Short Name:
- J/other/AstBu/69
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of speckle interferometric observations of 156 stars possessing global magnetic fields, carried out with the 6-m BTA telescope of the Special Astrophysical Observatory. Virtually all stars were observed between 2010 and 2012. Thirty-four stars were resolved into individual components (31 double and 3 triple), of which 14 binary systems (BD+41 43, HD2887, HD30466, HD36540, HD36955, HD37479, HD61045, HD89069, HD144334, HD164258, HD349321, HD343872, HD184471, HD196691) and 2 triple systems (HD37140, HD338226) were for the first time resolved by the astrometric method.
- ID:
- ivo://CDS.VizieR/J/other/RMxAA/48.177
- Title:
- Speckle interferometry of binaries
- Short Name:
- J/other/RMxAA/48
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present speckle interferometric measurements of binary stars performed during September and October of 2009 with the 2.1m telescope of the Observatorio Astronomico Nacional at SPM (Mexico). We report here the results of 200 measurements of 196 pairs with a primary limiting magnitude of V=12.3. The measured angular separations range from 0.115" to 5.26". Ninety seven pairs have separations less than 100. The mean error in separation is 0.03" and 1.5{deg} in position angle. The usual 180{deg} ambiguity was corrected for a majority of position angles by comparison with observations performed by other observers.
- ID:
- ivo://CDS.VizieR/J/AJ/137/3358
- Title:
- Speckle interferometry of massive stars
- Short Name:
- J/AJ/137/3358
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of a speckle interferometric survey of Galactic massive stars that complements and expands upon a similar survey made over a decade ago. The speckle observations were made with the Kitt Peak National Observatory and Cerro Tololo Inter-American Observatory 4 m telescopes and USNO speckle camera, and they are sensitive to the detection of binaries in the angular separation regime between 0.03" and 5" with relatively bright companions ({Delta}V<3). We report on the discovery of companions to 14 OB stars. In total we resolved companions of 41 of 385 O-stars (11%), 4 of 37 Wolf-Rayet stars (11%), and 89 of 139 B-stars (64%; an enriched visual binary sample that we selected for future orbital determinations).
- ID:
- ivo://CDS.VizieR/J/AJ/155/215
- Title:
- Speckle interferometry of red dwarf stars
- Short Name:
- J/AJ/155/215
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report high-resolution optical speckle observations of 336 M dwarfs, which results in 113 measurements of the relative position of 80 systems and 256 other stars with no indications of duplicity. These are the first measurements for two of the systems. We also present the earliest measurements of relative position for 17 others. We include orbits for six of the systems, two revised and four reported for the first time. For one of the systems with a new orbit, G 161-7, we determine masses of 0.156+/-0.011 and 0.1175+/-0.0079 M_{sun}_ for the A and B components, respectively. All six of these new calculated orbits have short periods (between five and 38 years) and hold the promise of deriving accurate masses in the near future. For many other pairs we can establish their nature as physical or chance alignment, depending on their relative motion. Of the 80 systems, 32 have calculated orbits, 25 others are physical pairs, four are optical pairs, and 19 are currently unknown.
