V0923 Aquilae
catalogues and names
| catalogues and names | V0923 Aql, HR 7415, HD 183656, SAO 124704, BD +3 4043 |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 19h 30min 33.1sec | DEC: +3° 26' 40'' | ||
| position (B1900) | RA: 19h 25min 32.8sec | DEC: +3° 14' 8'' | ||
| proper motion (J2000) | RA: 0.01 arcsec/a | DEC: 0.005 arcsec/a | ||
| radial velocity | -26 km/s note: variable radial velocity |
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| rotational velocity | 180 km/s (uncertain) (variable) | |||
| galactic coordinates | longitude: 40.5° | latitude: -7.09° | ||
magnitude
| visual magnitude | 6.05 (V on UBV Johnson system) |
spectral / color information
| spectral class | A0eShell |
| B-V-magnitude | 0.01 |
| U-B-magnitude | -0.37 |
| note (category: spectra): | He lines widened by rotation; NaI lines narrow. Also classified B9.5Ia. Line profiles vary. |
variability information
| variable star identification | V923 Aql |
| note (category: variability): | Gamma Cas, amp. 0.12V, 0.8518d. Variation may be due to rotation and inhomogeneous distribution of brightness on disk. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 19h 30min 33.125sec | DEC: +3° 26' 39.88'' | ±0.35 arcsec | source: 17 |
| proper motion (J2000) | RA: 0.001 arcsec/a | DEC: 0.005 arcsec/a | source: 25 | |
| radial velocity | -26 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 40.51° | latitude: -7.09° | ||
magnitude:
| visual | 6 (observed) | source: 31 |
| photovisual | 6.3 | source: 2 |
| photographic | 6 | source: 16 |
spectral information:
| spectral class | A0 | source: 96 | |
| Morgan-Keenan | A0e(shell) | source: 25 | |
| B-magnitude | 6.06 ±0.05 | B-V-magnitude | 0.01 |
| U-magnitude | 5.69 ±0.05 | U-B-magnitude | -0.37 |
variability information:
| variability type | 264 |
| var. amplitude | 0.12 |
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 | |
| 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: 19h 28min 2.933sec | DEC: +3° 20' 19.11'' | ±0.039 arcsec |
| position (J2000) | RA: 19h 30min 33.088sec | DEC: +3° 26' 40.08'' | |
| proper motion B1950 (FK4) | RA: 0.0005 arcsec/a | DEC: 0.007 arcsec/a | ±0.008 arcsec/a in RA ±0.007 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0007 arcsec/a | DEC: 0.005 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 6.3 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | A0 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 26937 |
| Durchmusterung | BD+03 4043 |
| Boss General Catalogue | 26937 |
| Henry Draper Catalogue | 183656 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 19h 28min 2.9sec | DEC: +3° 20' 19'' |
variability informations:
| variability type | GCAS | eruptive variable star |
| magnitute at max. brightness | 6.04 | |
| magnitute amplitude | 0.12 | |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | B5.5IIIpe-B8V |
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 | 5/923 |
| constellation | Aquila |
| notes on existence | The star is equivalent to '0050924 V0924'. |
| 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. |