T Vulpeculae
catalogues and names
| catalogues and names | T Vul, HR 7988, HD 198726, SAO 89216, BD +27 3890 |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 20h 51min 28.2sec | DEC: +28° 15' 2'' | ||
| position (2000.72) | RA: 20h 51min 30sec | DEC: +28° 15' 12'' | ||
| position (B1900) | RA: 20h 47min 13.4sec | DEC: +27° 52' 32'' | ||
| proper motion (J2000) | RA: 0.003 arcsec/a | DEC: -0.003 arcsec/a | ||
| radial velocity | -1 km/s note: spectroscopic binaries |
|||
| trigonometric parallax | 0.006 arcsec | |||
| galactic coordinates | longitude: 72.13° | latitude: -10.15° | ||
magnitude
| visual magnitude | 5.77 (V on UBV Johnson system) |
spectral / color information
| spectral class | F5Ib |
| B-V-magnitude | 0.72 |
| U-B-magnitude | 0.4 |
| R-I-magnitude | |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
variability information
| variable star identification | T Vul |
| note (category: variability): | CDelta 5.44 - 6.06V, 4.435572d. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 20h 51min 28.231sec | DEC: +28° 15' 1.91'' | ±0.35 arcsec | source: 17 |
| position (2000.72) | RA: 20h 51min 30sec | DEC: +28° 15' 12'' | JD: 2451806.24 | |
| proper motion (J2000) | RA: 0.0003 arcsec/a | DEC: -0.003 arcsec/a | source: 25 | |
| radial velocity | -1 km/s | source: 25 | ||
| trigonometric parallax | 0.006 arcsec | ±0.001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 72.14° | latitude: -10.15° | ||
magnitude:
| visual | 5.4 (observed) | source: 31 |
| photographic | 5.8 | source: 16 |
spectral information:
| spectral class | F8 | source: 96 | |
| Morgan-Keenan | F5Ib | source: 25 | |
| B-magnitude | 6.49 ±0.05 | B-V-magnitude | 0.72 |
| U-magnitude | 6.89 ±0.05 | U-B-magnitude | 0.4 |
variability information:
| variability type | 111 |
| var. amplitude | 0.68 |
| var. period | 4.44 |
| var. epoch | 2441705 22. January 1973, 12:00:00 UT |
| next max light | 2451810.44 22. September 2000, 22:33:36 UT |
sources:
| 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 | |
| 17 | ACRS |
| Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 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 (B1950) | RA: 20h 49min 20.753sec | DEC: +28° 3' 43.75'' | ±0.026 arcsec |
| position (2000.72) | RA: 20h 51min 30sec | DEC: +28° 15' 12'' | JD: 2451806.24 |
| position (J2000) | RA: 20h 51min 28.222sec | DEC: +28° 15' 1.91'' | |
| proper motion B1950 (FK4) | RA: 0.0001 arcsec/a | DEC: 0 arcsec/a | ±0.005 arcsec/a in RA ±0.004 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0002 arcsec/a | DEC: -0.004 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5.4 (accuracy: 1 decimal) |
| source of visual magnitude data | Source cited in source catalog introduction. |
spectral information:
| spectral class | F8p |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
remarks for duplicity and variability
| Variable star in visual magnitude in source catalog |
catalogues
| source catalogue | GC, catalogue number: 29089 |
| Durchmusterung | BD+27 3890 |
| Boss General Catalogue | 29089 |
| Henry Draper Catalogue | 198726 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 20h 49min 20.8sec | DEC: +28° 3' 44'' |
variability informations:
| variability type | DCEP | pulsating variable star |
| magnitute at max. brightness | 5.41 | |
| magnitute at min. brightness | 6.09 | |
| photometric system | visual, photovisual or Johnson's V | |
| epoch for maximum light [JD] | 2441705.121 22. January 1973, 14:54:14 UT |
|
| period [d] | 4.435462 | |
| next maximum light [JD] | 2451809.103436 21. September 2000, 14:28:57 UT |
|
| rising time | 32 % of period |
spectral information
| spectral class | F5Ib-G0Ib |
references
| to a study | Vol. I GCVS (see Kholopov et al. 1985-1988) |
| to a chart/photograph | Vol. I GCVS (see Kholopov et al. 1985-1988) |
miscanellous
| ID in the GCVS catalogue | 88/3 |
| constellation | Vulpecula |
| notes on existence | The star is equivalent to '0880004 U'. |
| There are notes in published catalog. | |
variability type description
| variability type | description |
| DCEP | These are the classical cepheids, or Delta Cep-type variables. Comparatively young objects that have left the main sequence and evolved into the instability strip of the Hertzsprung-Russell (H-R) diagram, they obey the well-known Cepheid period-luminosity relation and belong to the young disk population. DCEP stars are present in open clusters. They display a certain relation between the shapes of their light curves and their periods. |