Contenidos
Imágenes
Subir su imagen
DSS Images Other Images
Artículos relacionados
Binary Stars with Components of Solar Type: 25 Orbits and System Masses
Revised orbits and system masses are presented for the following 25visual double stars: WDS 00593–0040 (A 1902),WDS 00596–0111 (A 1903 AB), WDS 01023+0552(A 2003), WDS 01049+3649 (A 1515), WDS 01234+5809(STF 115 AB), WDS 02399+0009 (A 1928),WDS 03310+2937 (A 983), WDS 06573–3530 (I 65),WDS 07043–0303 (A 519), WDS 08267+2432 (A 1746BC), WDS 10585+1711 (A 2375), WDS 11308+4117 (STT 234),WDS 15370+6426 (HU 1168), WDS 16044–1122(STF 1998 AB), WDS 16283–1613 (RST 3950),WDS 17324+2848 (A 352), WDS 18466+3821 (HU 1191),WDS 19039+2642 (A 2992), WDS 19055+3352(HU 940),WDS 19282–1209 (SCJ 22), WDS 19487+1504 (A 1658),WDS 22400+0113 (A 2099), WDS 23506–5142 (SLR 14),WDS 23518–0637 (A 2700), and WDS 23529–0309(FIN 359). In all of these systems, at least one component is of solartype. Total system masses were calculated in each case from the orbitalperiod and semiaxis major together with the Hipparcos parallax, exceptin the cases for which there are no Hipparcos data or when these valuesare not precise. Other orbital and physical properties of these starsare also discussed. This paper is the second of three collating therevised double star orbits we have calculated in the past 15 yr.
| Speckle observations with PISCO in Merate: IV. Astrometric measurements of visual binaries in 2005
We present relative astrometric measurements of visual binaries madeduring the second semester of 2005, with the speckle camera PISCO at the102 cm Zeiss telescope of Brera Astronomical Observatory, in Merate. Oursample contains orbital couples as well as binaries whose motion isstill uncertain. The purpose of this long term program is to improve theaccuracy of the orbits and determine the masses of the components.\ Weperformed 130 new observations of 120 objects, with most of the angularseparations in the range 0\farcs1-4\arcsec, and with an average accuracyof 0\farcs01. Most of the position angles could be determined withoutthe usual 180° ambiguity with the application of triple-correlationtechniques, and their mean error is 0\fdg8. We have found a possible newtriple system: ADS 11077. škip0.15cm The measurements of theclosest binaries were made with a new data reduction procedure, based onmodel fitting of the background of the auto-correlations. As thisprocedure proved to be very efficient, we have re-processed the oldobservations of close binaries made with PISCO in Merate since 2004. Wethus improved 20 measurements already published and obtained 7 newmeasurements for observations that were previously reported as``unresolved".\ We finally present revised orbits for ADS 684, MCA 55Aac(in the Beta 1 Cyg-Albireo multiple system) and ADS 14783 for which thepreviously published orbits led to large residuals with our measurementsand for which the new observations made since their computation alloweda significant improvement of those old orbits. The sum of the massesthat we derived for those systems are consistent with the spectral typeof the stars and the dynamic parallaxes are in good agreement with theparallaxes measured by Hipparcos.
| Pulkovo compilation of radial velocities for 35495 stars in a common system.
Not Available
| Binary Star Speckle Interferometry: Measurements and Orbits
Results of our second observational run of binary star interferometricmeasurements with an ICCD speckle camera attached to the 1.52 mtelescope of the Observatorio Astronómico Nacional at Calar Alto(Almería, Spain) in 2000 June-July are presented. The measuredangular separations range from 0.096" to 6.558". With the use of the newspeckle data, the orbits of the visual binaries WDS 14369+4813 and WDS21597+4908 are improved.
| Planetary orbits in the elliptic restricted problem. V.. The ADS 11060 system
Numerical simulations are made within the framework of the ellipticplane restricted three-body problem, in order to determine whetherstable orbits exist for planets around one of the two components indouble stars. The ADS 11060 system is investigated here. Large stableplanetary orbits, already known to exist (more precisely, known to bepossible from the dynamical point of view) through a systematicexploration of the circular model and for several cases of the ellipticmodel (Sun-Jupiter, alpha Centauri, Sirius, eta Coronae Borealis andADS 12033), are found to exist around ADS 11060 A and ADS 11060 B up todistances from each star of the order of more than half the binary'speriastron separation. But, in this case, nearly circular stableplanetary orbits are not found to exist either in the so-called``habitable zone" around each star or anywhere else; this is very likelydue to the high value of the eccentricity of the binary's orbit.
| Speckle Interferometry at the US Naval Observatory. VIII.
The results of 2044 speckle interferometric observations of doublestars, made with the 26 inch (66 cm) refractor of the US NavalObservatory, are presented. Each speckle interferometric observation ofa system represents a combination of over a thousand short-exposureimages. These observations are averaged into 1399 mean positions andrange in separation from 0.16" to 14.97", with a mean separation of2.51". This is the eighth in a series of papers presenting measuresobtained with this system and covers the period 2001 March 18 through2001 December 30.
| Statistics of spectroscopic sub-systems in visual multiple stars
A large sample of visual multiples of spectral types F5-M has beensurveyed for the presence of spectroscopic sub-systems. Some 4200 radialvelocities of 574 components were measured in 1994-2000 with thecorrelation radial velocity meter. A total of 46 new spectroscopicorbits were computed for this sample. Physical relations are establishedfor most of the visual systems and several optical components areidentified as well. The period distribution of sub-systems has a maximumat periods from 2 to 7 days, likely explained by a combination of tidaldissipation with triple-star dynamics. The fraction of spectroscopicsub-systems among the dwarf components of close visual binaries withknown orbits is similar to that of field dwarfs, from 11% to 18% percomponent. Sub-systems are more frequent among the components of widevisual binaries and among wide tertiary components to the known visualor spectroscopic binaries - 20% and 30%, respectively. In triple systemswith both outer (visual) and inner (spectroscopic) orbits known, we findan anti-correlation between the periods of inner sub-systems and theeccentricities of outer orbits which must be related to dynamicalstability constraints. Tables 1, 2, and 6 are only available inelectronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr(130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/382/118
| Kinematics of Hipparcos Visual Binaries. II. Stars with Ground-Based Orbital Solutions
This paper continues kinematical investigations of the Hipparcos visualbinaries with known orbits. A sample, consisting of 804 binary systemswith orbital elements determined from ground-based observations, isselected. The mean relative error of their parallaxes is about 12% andthe mean relative error of proper motions is about 4%. However, even 41%of the sample stars lack radial velocity measurements. The computedGalactic velocity components and other kinematical parameters are usedto divide the stars with known radial velocities into kinematical agegroups. The majority (92%) of binaries from the sample are thin diskstars, 7.6% have thick disk kinematics and only two binaries have halokinematics. Among them, the long-period variable Mira Ceti has a verydiscordant {Hipparcos} and ground-based parallax values. From the wholesample, 60 stars are ascribed to the thick disk and halo population.There is an urgent need to increase the number of the identified halobinaries with known orbits and substantially improve the situation withradial velocity data for stars with known orbits.
| ICCD Speckle Observations of Binary Stars. XXIII. Measurements during 1982-1997 from Six Telescopes, with 14 New Orbits
We present 2017 observations of 1286 binary stars, observed by means ofspeckle interferometry using six telescopes over a 15 year period from1982 April to 1997 June. These measurements constitute the 23dinstallment in CHARA's speckle program at 2 to 4 m class telescopes andinclude the second major collection of measurements from the MountWilson 100 inch (2.5 m) Hooker Telescope. Orbital elements are alsopresented for 14 systems, seven of which have had no previouslypublished orbital analyses.
| Micrometer measurements of double stars made at the Côte D'Azur and Calar Alto observatories
We report 312 micrometer measurements of 155 visual double stars madewith the 50 cm refractor at the Côte D'Azur observatory (Nice,France) and with the 152 cm telescope at Calar Alto observatory(Almería, Spain).
| Two-colour photometry for 9473 components of close Hipparcos double and multiple stars
Using observations obtained with the Tycho instrument of the ESAHipparcos satellite, a two-colour photometry is produced for componentsof more than 7 000 Hipparcos double and multiple stars with angularseparations 0.1 to 2.5 arcsec. We publish 9473 components of 5173systems with separations above 0.3 arcsec. The majority of them did nothave Tycho photometry in the Hipparcos catalogue. The magnitudes arederived in the Tycho B_T and V_T passbands, similar to the Johnsonpassbands. Photometrically resolved components of the binaries withstatistically significant trigonometric parallaxes can be put on an HRdiagram, the majority of them for the first time. Based on observationsmade with the ESA Hipparcos satellite.
| Stochasticité parmi les orbites planétaires stables dans des systèmes d'étoiles doublesStochasticity among stable planetary orbits in double stellar systems
Not Available
| Speckle Interferometry at the US Naval Observatory. III.
Position angles and separations resulting from 2578 speckleinterferometric observations of 590 binary stars are tabulated. This isthe third in a series of papers presenting measures obtained using the66 cm refractor at the US Naval Observatory in Washington, DC, andcovers the period from 1995 June through 1996 December. Program starsrange in separation from 0.2" to 4.3", with a limiting magnitude ofV=11. Random errors are estimated to be 17.0 mas in separation and0.56d/rho in position angle, where rho is the separation in arcseconds.These are the first results acquired using an improved intensified CCDdetector. The new detector, in concert with an intensity-filteringtechnique applied in software, has permitted a 1 mag increase in dynamicrange, to 3.5 mag, for pairs separated by about 2". The instrumentationand calibration are briefly described, with an emphasis on thecharacteristics of the new detector. The software filter used toincrease the dynamic range is also described.
| Observations of Double Stars. XVIII.
Micrometer observations of 1350 pairs in 1995-1997 are listed.
| Micrometer measurements of double stars from the Spanish observatories at Calar Alto and Santiago de Compostela.
This paper reports 458 micrometer observations of visual double starsmade with the 152 cm. telescope at Calar Alto Observatory (Almeria,Spain) and with the 35 cm. telescope at Ramon Maria Aller Observatory(Santiago de Compostela, Spain). Tables 1 and 2 only available inelectronic form at CDS via anonymous ftp to cdsarc.u-strasbg.fr(130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html
| Planetary orbits in the elliptic restricted problem. IV. The ADS 12033 system
Numerical simulations are made within the frame of the elliptic planerestricted three-body problem, in order to search if stable orbits existfor planets around one of the two components in double stars. The ADS12033 system is investigated here. Large stable planetary orbits,already known to exist (more precisely, known to be possible from thedynamical point of view) through a systematic exploration of thecircular model and for several cases of the elliptic model (Sun-Jupiter,alpha Centauri, Sirius and eta Coronae Borealis), are found to existaround ADS 12033 A and ADS 12033 B up to distances from each star of theorder of more than half the binary's periastron separation. Moreover,nearly circular stable planetary orbits are found to exist in theso-called ``habitable zone" around each star.
| Stochasticity of Planetary Orbits in Double Star Systems
Cosmogonical theories as well as recent observations allow us to expectthe existence of planets around many stars other than the Sun. On another hand, double and multiple star systems are established to be morenumerous than single stars (such as the Sun), at least in the solarneighborhood. We are then faced to the following dynamical problem:assuming that planets can form in a binary early environment (I do notdeal here with), does long-term stability for planetary orbits exist indouble star systems. Although preliminary studies were ratherpessimistic about the possibility of existence of stable planetaryorbits in double or multiple star systems, modern computation have shownthat many such stable orbits do exist (but possible chaotic behavior),either around the binary as a whole (P-type) or around one component ofthe binary (S-type), this latter being explored here. The dynamicalmodel is the elliptic plane restricted three-body problem; the phasespace of initial conditions is systematically explored, and limits forstability have been established. Stable S-type planetary orbits arefound up to distance of their "sun" of the order of half the periastrondistance of the binary; moreover, among these stable orbits,nearly-circular ones exist up to distance of their "sun" of the order ofone quarter the periastron distance of the binary; finally, among thenearly-circular stable orbits, several stay inside the "habitable zone",at least for two nearby binaries which components are nearly of solartype. Nevertheless, we know that chaos may destroy this stability aftera long time (sometimes several millions years). It is thereforeimportant to compute indicators of chaos for these stable planetaryorbits to investigate their actual very long-term stability. Here wegive an example of such a computation for more than a billion years.
| Micrometer measurements of visual double stars made at the Cote d'Azur Observatory.
Not Available
| ICCD Speckle Observations of Binary Stars. XVII. Measurements During 1993-1995 From the Mount Wilson 2.5-M Telescope.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1997AJ....114.1639H&db_key=AST
| Speckle Interferometry at the US Naval Observatory. I.
We present speckle interferometer measurements of 467 binary stars takenat the US Naval Observatory in Washington, DC, using the 66 cmrefractor, from 1990 October through 1992 December. The observingprogram is designed to provide high-quality observations of binaries inthe 0."3--3."5 range of separations and as faint as 10.0 mag. More than8000 measurements have been made to date, of which we report the resultsfor 2329. Not only is it our intent to provide accurate data forinteresting binary stars, but also, by careful calibration, to firmlyrelate the "classical" astrometry of binary stars to that being obtainedtoday by speckle and that which will soon be obtained by other moderntechniques such as long-baseline optical interferometry.
| New orbits.
Not Available
| Observations of Double Stars and New Pairs. XVII.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1996ApJS..105..475H&db_key=AST
| Observations of double stars and new pairs. XV
The study reports visual and photographic measures listed for 1150 pairsobtained in the time frame 1989.91-1992.15, including 221 new doublestars. Magnitudes were estimated for a part of the objects, especiallythe fainter ones. Plate orientations were calculated from field stars ofknown positions and were precessed to the epoch; numbers of nights andof measured exposures are given. Reobservation of faint, neglected pairsreveal many corrections to the data from the old discovery lists.
| Micrometer measurements of visual double stars made at Nice
Three-hundred thirty-five micrometer measurements of visual double starsmade at Nice Observatory with the 50-cm and 74-cm refractors arereported. The tables give the Washington Catalog number, letters of thecomponents if the star is multiple, the Aitken Catalog number, theobservational epoch, the observed position angle and angular distance,the number of nights, and the name of the observer.
| ICCD speckle observations of binary stars. IV - Measurements during 1986-1988 from the Kitt Peak 4 M telescope
One thousand five hundred and fifty measurements of 1006 binary starsystems observed mostly during 1986 through mid-1988 by means of speckleinterferometry with the KPNO 4-m telescope are presented. Twenty-onesystems are directly resolved for the first time, including newcomponents to the cool supergiant Alpha Her A and the Pleiades shellstar Pleione. A continuing survey of The Bright Star Catalogue yieldedeight new binaries from 293 bright stars observed. Corrections tospeckle measures from the GSU/CHARA ICCD speckle camera previouslypublished are presented and discussed.
| Micrometer observations of double stars and new pairs. XIII
From a program of double star observations which emphasizes orbital,neglected, and newly discovered pairs, results obtained from October1984 to January 1987 are presented. A total of 3030 visual and 550photographic measures are listed. The positions in WDS format andDurchmusterung numbers are shown for 117 pairs for which firstobservations appear in this paper. Magnitudes are estimated for some ofthe objects.
| Micrometer Observations of Double Stars and New Pairs - Part Ten
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1980ApJS...44..111H&db_key=AST
| Orbital Elements of 14 Visual Double Stars
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1980A&AS...39...83B&db_key=AST
| Double star measures at Lick Observatory, Mount Hamilton, California.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1978PASP...90..465H&db_key=AST
| Micrometric measures of visual double stars.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1975PASP...87..253H&db_key=AST
|
Enviar un nuevo artículo
Enlaces relacionados
- - No se han encontrado enlaces -
En viar un nuevo enlace
Miembro de los siguientes grupos:
|
Datos observacionales y astrométricos
| Constelación: | Lira |
| Ascensión Recta: | 19h05m30.85s |
| Declinación: | +33°52'21.4" |
| Magnitud Aparente: | 8.73 |
| Distancia: | 93.633 parsecs |
| Movimiento Propio en Ascensión Recta: | 17.4 |
| Movimiento Propio en Declinación: | -31.4 |
| B-T magnitude: | 9.444 |
| V-T magnitude: | 8.789 |
Catálogos y designaciones:
|
