FX Lib
| catalogues and names | FX Lib, 48 Lib, HR 5941, HD 142983, SAO 159607, FK5: 1417 |
| constellation | Libra |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 15h 58min 11,4sec | DEC: -14° 16' 46'' |
| position (J1900) | RA: 15h 52min 35,2sec | DEC: -13° 59' 27'' |
| proper motion (J2000) | RA: -0,012 arcsec/a | DEC: -0,015 arcsec/a |
| radial velocity | -6 km/s note: spectroscopic binaries |
|
| rotational velocity | 393 km/s (uncertain) (variable) | |
| note (category: radial and/or rotational velocities): | Shell oscillations. Unstable circumstellar shell expanding -25k/s. RV has quasi period of about 10 yrs, amp. about 200k/s. |
magnitude
| visual magnitude | 4,88 (V on UBV Johnson system) |
spectral / color information
| spectral class | B5IIIp |
| B-V-magnitude | -0,1 |
| U-B-magnitude | -0,2 |
| R-I-magnitude | -0,03 |
| note (category: spectra): | Strong Lambda 4619 absorption. Shell star with variable hydrogen emission profiles. Also classified B3:IV:e-shell. |
variability information
| variable star identification | FX Lib |
| note (category: variability): | Gamma Cas 4.79 - 4.96V. Variable polarization. R-I also found at -0.13. |
miscellaneous information
| note (category: group membership): | Sco-Cen assoc.; probable member of Sco-Cen cluster; member of Pleiades group. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 15h 58min 11,374sec | DEC: -14° 16' 45,73'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: -0,0008 arcsec/a | DEC: -0,015 arcsec/a | source: 25 | |
| radial velocity | -6 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 356,39° | latitude: 28,63° | ||
| GCI unit vector (J2000) | X: -0,491167 | Y: -0,835415 | Z: -0,24665 | |
magnitude:
| visual | 4,7 (observed) | source: 31 |
| photovisual | 4,7 | source: 2 |
| photographic | 4,5 | source: 2 |
spectral information:
| spectral class | B3 | source: 96 | |
| Morgan-Keenan | B5IIIp | source: 25 | |
| B-magnitude | 4,78 ±0,05 | B-V-magnitude | -0,1 |
| U-magnitude | 4,58 ±0,05 | U-B-magnitude | -0,2 |
variability information:
| variability type | 264 |
| var. amplitude | 0,22 |
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 | |
| 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 | |
| 31 | CRM' (non-GCVS variable data) |
| Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 1994 | |
| 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: 15h 55min 23,102sec | DEC: -14° 8' 11,73'' | ±0,007 arcsec |
| position (J2000) | RA: 15h 58min 11,374sec | DEC: -14° 16' 45,74'' | |
| proper motion J1950 (FK4) | RA: -0,001 arcsec/a | DEC: -0,019 arcsec/a | ±0,002 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0008 arcsec/a | DEC: -0,015 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4,7 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | B3p |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 1417 |
| Durchmusterung | BD-13 4302 |
| Boss General Catalogue | 21439 |
| Henry Draper Catalogue | 142983 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (J1950) | RA: 15h 55min 23,1sec | DEC: -14° 8' 12'' |
variability informations:
| variability type | GCAS | eruptive variable star |
| magnitute at max. brightness | 4,74 | |
| magnitute at min. brightness | 4,96 | |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | B5IIIpe |
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 | 49/187 |
| constellation | Libra |
| notes on existence | The star is equivalent to '0490188 FY'. |
| There are notes in published catalog. | |
variability type description
| variability type | description |
| GCAS | Eruptive irregular variables of the Gamma Cas type. These are rapidly rotating B III-IVe stars with mass outflow from their equatorial zones. The formation of equatorial rings or disks is often accompanied by temporary fading. Light amplitudes may reach 1.5 mag in V. |