R Cassiopeiae
catalogues and names
| catalogues and names | R Cas, HR 9066, HD 224490, SAO 35938, BD +50 4202, WDS 23584+5123A |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 23h 58min 24.8sec | DEC: +51° 23' 19'' | ||
| position (2000.72) | RA: 23h 58min 27sec | DEC: +51° 23' 33'' | ||
| position (B1900) | RA: 23h 53min 19.6sec | DEC: +50° 49' 54'' | ||
| proper motion (J2000) | RA: 0.08 arcsec/a | DEC: 0.009 arcsec/a | ||
| radial velocity | 21 km/s note: variable radial velocity |
|||
| galactic coordinates | longitude: 114.56° | latitude: -10.62° | ||
magnitude
| visual magnitude | 4.8 (V on UBV Johnson system) |
spectral / color information
| spectral class | M7IIIe |
| B-V-magnitude | 1.83 |
| U-B-magnitude | 0.08 |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
| note (category: spectra): | OH and H2O emission strong in infrared. IR spectra show water vapor. Variable M6e-M10e. |
variability information
| variable star identification | R Cas |
| note (category: variability): | ADS 17135A, M 4.7 - 13.5v, 430.46d. Variable SiO maser source, indicating shell-like structure. Single cycle 6.45 to 11.25V, +1.31 to +2.66(B-V), -0.07 to +1.02(U-B). |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 29.5 arcsec |
| mag difference (of double or brightest multiple) | 5.4 |
| component ID | AC |
| note (category: double and multiple data): | Companions optical. |
miscellaneous information
| note (category: polarization): | Polarization possibly due to circumstellar dust scattering. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 23h 58min 24.714sec | DEC: +51° 23' 21.68'' | ±0.43 arcsec | source: 16 |
| position (2000.72) | RA: 23h 58min 27sec | DEC: +51° 23' 36'' | JD: 2451806.35 | |
| proper motion (J2000) | RA: 0.0063 arcsec/a | DEC: 0.042 arcsec/a | source: 25 | |
| radial velocity | 21 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 114.57° | latitude: -10.62° | ||
magnitude:
| visual | 6.45 (observed) | source: 2 |
| photographic | 9.8 | source: 16 |
spectral information:
| spectral class | M7e | source: 29 | |
| Morgan-Keenan | M7IIIe | source: 25 | |
| B-magnitude | 8.28 ±0.02 | B-V-magnitude | 1.83 |
| U-magnitude | 8.36 ±0.02 | U-B-magnitude | 0.08 |
variability information:
| variability type | 180 |
| var. amplitude | 8.8 |
| var. period | 430.46 |
| var. epoch | 2444463 11. August 1980, 12:00:00 UT |
| next max light | 2452211.28 28. October 2001, 18:43:12 UT |
double/multiple star system information:
| separation between brightest and second brightest component | 18.3 arcsec |
| position angle | 269 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 6.45 | M7e | HR 9066, HD 224490, SAO 35938 |
| B | 11.1 | G0 |
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 | |
| 29 | SAOJ2000 |
| SAO on FK5 at J2000, 1989 | |
| 30 | GCVS, 4th edition |
| Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88 | |
data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)
position and proper motion:
| position (B1950) | RA: 23h 55min 51.685sec | DEC: +51° 6' 36.38'' | ±0.035 arcsec |
| position (2000.72) | RA: 23h 58min 27sec | DEC: +51° 23' 32'' | JD: 2451806.35 |
| position (J2000) | RA: 23h 58min 24.836sec | DEC: +51° 23' 18.76'' | |
| proper motion B1950 (FK4) | RA: 0.0083 arcsec/a | DEC: 0.014 arcsec/a | ±0.006 arcsec/a in RA ±0.006 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0085 arcsec/a | DEC: 0.009 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4.8 (accuracy: 1 decimal) |
| source of visual magnitude data | Source cited in source catalog introduction. |
spectral information:
| spectral class | M7e |
| 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: 33244 |
| Durchmusterung | BD+50 4202 |
| Boss General Catalogue | 33244 |
| Henry Draper Catalogue | 224490 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 23h 58.4min | DEC: +51° 23' |
| proper motion (J2000) | RA: 0.066 arcsec/a | DEC: 0.049 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 | 1899 | 3 | 277° | 8.8'' | - | 14.5 | M7IIIe | ES 37 |
| 1962 | 269° | 18.3'' | ||||||
| AC | 1899 | 3 | 333° | 27.3'' | - | 10.2 | - | ES 37 |
| 1962 | 324° | 29.5'' |
discoverer information:
| discoverer code | discoverer | reference |
| ES 37 | Espin, T.E. | - |
notes:
| note | A is the Mira-type variable R Cas. |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 23h 55min 51.7sec | DEC: +51° 6' 36'' |
variability informations:
| variability type | M | pulsating variable star |
| magnitute at max. brightness | 4.7 | |
| magnitute at min. brightness | 13.5 | |
| photometric system | visual, photovisual or Johnson's V | |
| epoch for maximum light [JD] | 2444463 11. August 1980, 12:00:00 UT |
|
| period [d] | 430.46 | |
| next maximum light [JD] | 2452211.28 28. October 2001, 18:43:12 UT |
|
| rising time | 40 % of period |
spectral information
| spectral class | M6e-M10e |
references
| to a study | the main characteristics of the star was determined by the authors themselves |
| to a chart/photograph | Vol. I GCVS (see Kholopov et al. 1985-1988) |
miscanellous
| ID in the GCVS catalogue | 18/1 |
| constellation | Cassiopeia |
| notes on existence | The star is equivalent to '0180002 S'. |
| There are notes in published catalog. | |
variability type description
| variability type | description |
| M | Mira (Omicron) Ceti-type variables. These are long-period variable giants with characteristic late-type emission spectra (Me, Ce, Se) and light amplitudes from 2.5 to 11 mag in V. Their periodicity is well pronounced, and the periods lie in the range between 80 and 1000 days. Infrared amplitudes are usually less than in the visible and may be <2.5 mag. For example, in the K band they usually do not exceed 0.9 mag. If the amplitudes exceed 1 - 1.5 mag , but it is not certain that the true light amplitude exceeds 2.5 mag, the symbol "M" is followed by a colon, or the star is attributed to the semiregular class with a colon following the symbol for that type (SR). |