SX Arietis
catalogues and names
| catalogues and names | SX Ari, 56 Ari, HR 954, HD 19832, SAO 75788, BD +26 523 |
| constellation | Aries |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 3h 12min 14.2sec | DEC: +27° 15' 25'' | ||
| position (B1900) | RA: 3h 6min 16.6sec | DEC: +26° 52' 48'' | ||
| proper motion (J2000) | RA: 0.01 arcsec/a | DEC: -0.017 arcsec/a | ||
| radial velocity | 11 km/s note: variable radial velocity |
|||
| rotational velocity | 200 km/s (uncertain) (variable) | |||
| galactic coordinates | longitude: 157.68° | latitude: -25.95° | ||
| note (category: radial and/or rotational velocities): | Period 0.728d probably rotation period. Earlier determination vsini 94k/s. |
magnitude
| visual magnitude | 5.79 (V on UBV Johnson system) |
spectral / color information
| spectral class | B9pSi |
| B-V-magnitude | -0.12 |
| U-B-magnitude | -0.42 |
variability information
| variable star identification | SX Ari |
| note (category: variability): | SX Ari 5.67 - 5.81V, 0.7278925d. Spectral variations (SiII, HeI, same period). Possible 30 min Sp. var. suggesting star spots related to magnetic field. Silicon abundance varies 10 to 100 times solar, and magnesium 0.03 to 10 times solar. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 3h 12min 14.216sec | DEC: +27° 15' 25.06'' | ±0.43 arcsec | source: 16 |
| proper motion (J2000) | RA: 0.0003 arcsec/a | DEC: -0.021 arcsec/a | source: 25 | |
| radial velocity | 11 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 157.68° | latitude: -25.95° | ||
magnitude:
| visual | 5.7 (observed) | source: 31 |
| photovisual | 5.7 | source: 2 |
| photographic | 5.6 | source: 16 |
spectral information:
| spectral class | A0 | source: 96 | |
| Morgan-Keenan | B9pSi | source: 25 | |
| B-magnitude | 5.67 ±0.05 | B-V-magnitude | -0.12 |
| U-magnitude | 5.25 ±0.05 | U-B-magnitude | -0.42 |
variability information:
| variability type | 420 |
| var. amplitude | 0.14 |
| var. period | 0.73 |
| var. epoch | 2437668 3. January 1962, 12:00:00 UT |
| next max light | 2452219.82 6. November 2001, 07:40:48 UT |
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 | |
| 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 (B1950) | RA: 3h 9min 15.105sec | DEC: +27° 4' 11.6'' | ±0.02 arcsec |
| position (J2000) | RA: 3h 12min 14.241sec | DEC: +27° 15' 25.34'' | |
| proper motion B1950 (FK4) | RA: 0.0008 arcsec/a | DEC: -0.013 arcsec/a | ±0.004 arcsec/a in RA ±0.003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0008 arcsec/a | DEC: -0.017 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5.6 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | A0p |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 3821 |
| Durchmusterung | BD+26 523 |
| Boss General Catalogue | 3821 |
| Henry Draper Catalogue | 19832 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 3h 9min 15.1sec | DEC: +27° 4' 12'' |
variability informations:
| variability type | SXARI | rotating variable star |
| magnitute at max. brightness | 5.67 | |
| magnitute at min. brightness | 5.81 | |
| photometric system | visual, photovisual or Johnson's V | |
| epoch for maximum light [JD] | 2437667.728 3. January 1962, 05:28:19 UT |
|
| period [d] | 0.7278925 | |
| next maximum light [JD] | 2452219.75486 6. November 2001, 06:07:00 UT |
|
| rising time | 25 % of period |
spectral information
| spectral class | B7p(Si-HeI) |
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 | 7/24 |
| constellation | Aries |
| notes on existence | The star is equivalent to '0070025 SY'. |
| There are notes in published catalog. | |
variability type description
| variability type | description |
| SXARI | SX Arietis-type variables. These are main-sequence B0p-B9p stars with variable-intensity He I and Si III lines and magnetic fields. They are sometimes called helium variables. Periods of light and magnetic field changes (about 1 day) coincide with rotational periods, while amplitudes are approximately 0.1 mag in V. These stars are high-temperature analogs of the ACV variables. |