Seginus
| catalogues and names | Seginus, g Boo, gam Boo, 27 Boo, HR 5435, HD 127762, SAO 64203, FK5: 535, WDS 14321+3818A |
| other names | Ceginus, Haris in Becvar |
| constellation | Bootes |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | Seginus; Ceginus; Haris in Becvar. |
position, motion, parallax:
| position (J2000) | RA: 14h 32min 4,7sec | DEC: +38° 18' 30'' |
| position (J1900) | RA: 14h 28min 3sec | DEC: +38° 44' 44'' |
| proper motion (J2000) | RA: -0,114 arcsec/a | DEC: 0,153 arcsec/a |
| radial velocity | -37 km/s note: variable radial velocity |
|
| rotational velocity | 139 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,025 arcsec | |
| note (category: radial and/or rotational velocities): | Varies in period of 0.25d. |
magnitude
| visual magnitude | 3,03 (V on UBV Johnson system) |
spectral / color information
| spectral class | A7III |
| B-V-magnitude | 0,19 |
| U-B-magnitude | 0,12 |
| R-I-magnitude | 0,08 |
variability information
| variable star identification | Gam Boo |
| note (category: variability): | Delta Sct 3.02 - 3.07V, 3.23 - 3.28B, 3.20 - 3.25p, 0.2903137d. Hydrogen and Ca lines vary. |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 33,4 arcsec |
| mag difference (of double or brightest multiple) | 9,5 |
| note (category: double and multiple data): | Primary found double by speckle interferometry, sep. 0.069". Component B, optical. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 14h 32min 4,674sec | DEC: +38° 18' 29,74'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: -0,0097 arcsec/a | DEC: 0,153 arcsec/a | source: 25 | |
| radial velocity | -37 km/s | source: 25 | ||
| trigonometric parallax | 0,025 | ±0,002 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 67,24° | latitude: 66,17° | ||
| GCI unit vector (J2000) | X: -0,618178 | Y: -0,483312 | Z: 0,619892 | |
magnitude:
| visual | 3,03 (observed) | source: 25 |
| photovisual | 3 | source: 2 |
spectral information:
| spectral class | F0 | source: 96 | |
| Morgan-Keenan | A7III | source: 25 | |
| B-magnitude | 3,22 ±0,05 | B-V-magnitude | 0,19 |
| U-magnitude | 3,34 ±0,05 | U-B-magnitude | 0,12 |
variability information:
| variability type | 10 |
| var. amplitude | 0,05 |
| var. period | 0,29 |
double/multiple star system information:
| separation between brightest and second brightest component | 0,2 arcsec |
| position angle | 178 ° |
sources:
| 2 | HD and HDE Catalogs |
| Cannon, A.J., and E.C. Pickering, Harvard Annals, Vols 91-99, 1918-24, Cambridge, Massachusetts: Harvard University; Cannon, A.J., Harvard Annals, Vol. 100, 1925-36, Cambridge, Massachusetts: Harvard University; and Cannon, A.J., and M. Walton Mayall, Harvard Annals, Vol. 112, 1949, Cambridge, Massachusetts: Harvard University | |
| 15 | FK5, FK5 Extension and FK5 Supplement |
| Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 1991 | |
| 19 | WDS Catalog |
| Worley, C.E., and G.G. Douglass, Washington Catalog of Visual Double Stars 1996.0, United States Naval Observatory, 1996 | |
| 25 | Bright Star Catalogue, 5th edition |
| Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994 | |
| 30 | GCVS, 4th edition |
| Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88 | |
| 96 | SAO or HD/HDE Catalog |
| Reference from Value 1 or Reference from Value 2 | |
data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)
position and proper motion:
| position (J1950) | RA: 14h 30min 3,837sec | DEC: +38° 31' 34,12'' | ±0,004 arcsec |
| position (J2000) | RA: 14h 32min 4,679sec | DEC: +38° 18' 29,7'' | |
| proper motion J1950 (FK4) | RA: -0,0099 arcsec/a | DEC: 0,149 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0096 arcsec/a | DEC: 0,153 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | F0 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 535 |
| Durchmusterung | BD+38 2565 |
| Boss General Catalogue | 19607 |
| Henry Draper Catalogue | 127762 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 14h 32,1min | DEC: +38° 18' |
| proper motion (J2000) | RA: -0,114 arcsec/a | DEC: 0,153 arcsec/a |
double/multiple star system information:
| component | year | number of measures | position angle | angular separation | magnitude of 1st component | magnitude of 2nd component | spectral class(es) | discoverer code |
| Aa | 1975 | 2 | 78° | 0,1'' | 3,03 | - | A7III | BLM |
| 1984 | 178° | 0,2'' | ||||||
| Aa-B | 1878 | - | 99° | 26,2'' | 3,03 | 12,7 | - | BU 616 |
| 1925 | 111° | 33,4'' |
discoverer information:
| discoverer code | discoverer | reference |
| BLM | Morgan, B. et al | |
| BU 616 | Burnham, S.W. | - |
notes:
| note | Gamma Boo. A is a Delta Scuti-type system. |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (J1950) | RA: 14h 30min 3,8sec | DEC: +38° 31' 34'' |
variability informations:
| variability type | DSCTC: | pulsating variable star |
| magnitute at max. brightness | 3,02 | |
| magnitute at min. brightness | 3,07 | |
| photometric system | visual, photovisual or Johnson's V | |
| period [d] | 0,2903137 | |
| rising time | 50 % of period (uncertain) |
spectral information
| spectral class | A7III |
references
| to a study | Vol. I GCVS (see Kholopov et al. 1985-1988) |
| to a chart/photograph | no chart is avaible, but the star is contained in the 'Bonner Durchmusterung' |
miscanellous
| ID in the GCVS catalogue | 9/9003 |
| constellation | Bootes |
| notes on existence | The star is equivalent to '0099009 iot'. |
| There are notes in published catalog. | |
variability type description
| variability type | description |
| DSCTC | Variables of the Delta Scuti type. These are pulsating variables of spectral types A0-F5 III-V displaying light amplitudes from 0.003 to 0.9 mag in V (usually several hundredths of a magnitude) and periods from 0.01 to 0.2 days. The shapes of the light curves, periods, and amplitudes usually vary greatly. Radial as well as nonradial pulsations are observed. The variability of some members of this type appears sporadically and sometimes completely ceases, this being a consequence of strong amplitude modulation with the lower value of the amplitude not exceeding 0.001 mag in some cases. The maximum of the surface layer expansion does not lag behind the maximum light for more than 0.1 periods. DSCT stars are representatives of the galactic disk (flat component) and are phenomenologically close to the SX Phe variables. DSCTC Low amplitude group of Delta Sct variables (light amplitude <0.1 mag in V). The majority of this type's representatives are stars of luminosity class V; objects of this subtype generally are representative of the Delta Sct variables in open clusters. |