m Librae
catalogues and names
| catalogues and names | m Lib, NSV 06816, 7 Lib, HR 5523, HD 130559, SAO 158821, BD -13 3986, WDS 14493-1409A |
| constellation | Libra |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 14h 49min 19.1sec | DEC: -14° 8' 56'' | ||
| position (B1900) | RA: 14h 43min 50sec | DEC: -13° 43' 57'' | ||
| proper motion (J2000) | RA: -0.061 arcsec/a | DEC: -0.014 arcsec/a | ||
| radial velocity | -4 km/s note: spectroscopic binaries |
|||
| rotational velocity | 26 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.006 arcsec | |||
| galactic coordinates | longitude: 341.3° | latitude: 39.78° | ||
| note (category: dynamical parallaxes): | 0.016". |
magnitude
| visual magnitude | 5.31 (V on UBV Johnson system) |
spectral / color information
| spectral class | A1pSrCrEu |
| B-V-magnitude | 0.07 |
| U-B-magnitude | -0.05 |
| note (category: spectra): | Also classified A0III:pSrCr,s. |
variability information
| variable star identification | 6816 |
| note (category: variability): | ADS 9396AB, Alpha CV. |
double/multiple star system information
| number of components of multiple star system | 5 |
| separation | 1.8 arcsec |
| mag difference (of double or brightest multiple) | 0.9 |
| component ID | AB |
| note (category: double and multiple data): | AB and AE binary. B = Am(A2/A6/A8)s. C and D optical. E 12.5v at 27". |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 14h 49min 19.04sec | DEC: -14° 8' 55.89'' | ±0.19 arcsec | source: 16 |
| proper motion (J2000) | RA: -0.0046 arcsec/a | DEC: -0.016 arcsec/a | source: 25 | |
| radial velocity | -4 km/s | source: 25 | ||
| trigonometric parallax | 0.006 arcsec | ±0.001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 341.31° | latitude: 39.78° | ||
magnitude:
| visual | 5.31 (observed) | source: 25 |
| photovisual | 5.8 | source: 16 |
| photographic | 5.4 | source: 2 |
spectral information:
| spectral class | A2 | source: 96 | |
| Morgan-Keenan | A1pSrCrEu | source: 25 | |
| B-magnitude | 5.38 ±0.05 | B-V-magnitude | 0.07 |
| U-magnitude | 5.33 ±0.05 | U-B-magnitude | -0.05 |
double/multiple star system information:
| separation between brightest and second brightest component | 1.9 arcsec |
| magnitude difference between brightest and second brightest component | 0.9 |
| position angle | 1 ° |
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 | |
| 16 | PPM North and PPM South Catalogs and PPM Supplement |
| Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993 | |
| 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 | |
| 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 (B1950) | RA: 14h 46min 34.325sec | DEC: -13° 56' 30.44'' | ±0.014 arcsec |
| position (J2000) | RA: 14h 49min 19.074sec | DEC: -14° 8' 56.16'' | |
| proper motion B1950 (FK4) | RA: -0.0044 arcsec/a | DEC: -0.019 arcsec/a | ±0.003 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0042 arcsec/a | DEC: -0.014 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5.4 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | A2p |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
remarks for duplicity and variability
| Double star in Aitken's Double Star Catalogue (Aitken 1932) |
catalogues
| source catalogue | GC, catalogue number: 19938 |
| Durchmusterung | BD-13 3986 |
| Boss General Catalogue | 19938 |
| Henry Draper Catalogue | 130559 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 14h 49.3min | DEC: -14° 9' |
| proper motion (J2000) | RA: -0.066 arcsec/a | DEC: -0.01 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 |
| AB | 1875 | 76 | 335° | 1.4'' | 5.8 | 6.7 | A1pSrCrEu | BU 106 |
| 1991 | 1° | 1.9'' | ||||||
| AC | 1889 | 4 | 283° | 18.2'' | 5.4 | 14.5 | - | BU 106 |
| 1958 | 289° | 15'' | ||||||
| AD | 1889 | 4 | 185° | 26.1'' | 5.4 | 13.9 | - | BU 106 |
| 1958 | 174° | 25'' | ||||||
| AE | 1878 | 6 | 232° | 27.3'' | 5.4 | 12.5 | - | BU 106 |
discoverer information:
| discoverer code | discoverer | reference |
| BU 106 | Burnham, S.W. | - |
notes:
| note | Mu Lib. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 14h 46min 34.3sec | DEC: -13° 56' 30'' |
variability informations:
| variability type | ACV | rotating variable star |
| magnitute at max. brightness | 5.32 | |
| magnitute at min. brightness | ||
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | AP |
references
| to a study | 691176D (designation: mu LIB) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |
variability type description
| variability type | description |
| ACV |
Alpha2 Canum Venaticorum variables. These are main-sequence stars with spectral types B8p-A7p and displaying strong magnetic fields. Spectra show abnormally strong lines of Si, Sr, Cr, and rare earths whose intensities vary with rotation. They exhibit magnetic field and brightness changes (periods of 0.5-160 days or more). The amplitudes of the brightness changes are usually withine 0.01-0.1 mag in V. ACVO Rapidly oscillating Alpha2 CVn variables. These are nonradially pulsating, rotating magnetic variables of Ap spectral type (DO Eri). Pulsation periods are in the range of 6-12 mmag (0.004-0.01 days), while amplitudes of light variation caused by the pulsation are about 0.01 mag in V. The pulsational variations are superposed on those caused by rotation. |