QW Puppis
catalogues and names
| catalogues and names | QW Pup, HR 2740, HD 55892, SAO 218537, CD -46 2977, FK5: 275 |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 7h 12min 33.6sec | DEC: -46° 45' 34'' | ||
| position (2000.72) | RA: 7h 12min 35sec | DEC: -46° 45' 38'' | ||
| position (B1900) | RA: 7h 9min 42.5sec | DEC: -46° 35' 32'' | ||
| proper motion (J2000) | RA: -0.132 arcsec/a | DEC: 0.103 arcsec/a | ||
| radial velocity | -1 km/s | |||
| rotational velocity | 54 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.048 arcsec | |||
| galactic coordinates | longitude: 257.72° | latitude: -16.02° | ||
magnitude
| visual magnitude | 4.49 (V on UBV Johnson system) |
spectral / color information
| spectral class | F0IV |
| B-V-magnitude | 0.32 |
| U-B-magnitude | -0.01 |
| R-I-magnitude |
variability information
| variable star identification | QW Pup |
| note (category: variability): | Amp. about 0.07u, 0.04v, 0.02b, 0.04y; 0.936d. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 7h 12min 33.638sec | DEC: -46° 45' 33.83'' | ±0.06 arcsec | source: 15 |
| position (2000.72) | RA: 7h 12min 35sec | DEC: -46° 45' 38'' | JD: 2451809.25 | |
| proper motion (J2000) | RA: -0.0128 arcsec/a | DEC: 0.103 arcsec/a | source: 25 | |
| radial velocity | -1 km/s | source: 25 | ||
| trigonometric parallax | 0.048 arcsec | ±0.005 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 257.72° | latitude: -16.02° | ||
magnitude:
| visual | 4.49 (observed) | source: 25 |
| photovisual | 4.5 | source: 2 |
| photographic | 4.8 | source: 2 |
spectral information:
| spectral class | F0 | source: 96 | |
| Morgan-Keenan | F0IV | source: 25 | |
| B-magnitude | 4.81 ±0.05 | B-V-magnitude | 0.32 |
| U-magnitude | 4.8 ±0.05 | U-B-magnitude | -0.01 |
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 | |
| 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: 7h 11min 8.037sec | DEC: -46° 40' 29.97'' | ±0.011 arcsec |
| position (2000.72) | RA: 7h 12min 36sec | DEC: -46° 45' 44'' | JD: 2451809.25 |
| position (J2000) | RA: 7h 12min 33.625sec | DEC: -46° 45' 33.97'' | |
| proper motion B1950 (FK4) | RA: -0.0136 arcsec/a | DEC: 0.1 arcsec/a | ±0.003 arcsec/a in RA ±0.003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0129 arcsec/a | DEC: 0.101 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4.5 (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: 275 |
| Durchmusterung | CD-46 2977 |
| Boss General Catalogue | 9569 |
| Henry Draper Catalogue | 55892 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 7h 11min 8sec | DEC: -46° 40' 30'' |
variability informations:
| variability type | ACV | rotating variable star |
| magnitute at max. brightness | 4.47 | |
| magnitute amplitude | 0.027 | |
| photometric system | visual, photovisual or Johnson's V |
references
| to a study | H.Hensberge, H.M.Maitzen, G.Deridder, M.Gerbaldi, F.Delmas, P.Renson, C.Doom, W.W.Weiss, N.Morguleff, AsAp Suppl 46,151,1981. |
| to a chart/photograph | no chart is avaible, but the star is contained in the 'Cordoba Durchmusterung' |
miscanellous
| ID in the GCVS catalogue | 68/331 |
| constellation | Puppis |
| notes on existence | The star is equivalent to '67191'. |
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. |