XY Persei
catalogues and names
| catalogues and names | XY Per, HD 275877, SAO 56726, BD +38 811, WDS 03496+3859 |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 3h 49min 36.352sec | DEC: +38° 58' 55.16'' | ±0.44 arcsec | source: 16 |
| position (2000.74) | RA: 3h 49min 39sec | DEC: +38° 59' 3'' | JD: 2451813.20 | |
| proper motion (J2000) | RA: 0.0001 arcsec/a | DEC: -0.015 arcsec/a | source: 16 | |
| galactic coord. (B1950) | longitude: 156.8° | latitude: -11.9° | ||
magnitude:
| visual | 9.36 (observed) | source: 20 |
| photographic | 9.2 | source: 35 |
spectral information:
| spectral class | A2 | source: 29 | |
| Morgan-Keenan | A2II | source: 98 | |
| B-magnitude | 9.88 ±0.02 | B-V-magnitude | 0.52 |
| U-magnitude | 10.4 ±0.02 | U-B-magnitude | 0.52 |
variability information:
| variability type | 271 |
| var. amplitude | 1.2 |
double/multiple star system information:
| separation between brightest and second brightest component | 1.3 arcsec |
| magnitude difference between brightest and second brightest component | 0.7 |
| position angle | 74 ° |
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 | |
| 19 | WDS Catalog |
| Worley, C.E., and G.G. Douglass, Washington Catalog of Visual Double Stars 1996.0, United States Naval Observatory, 1996 | |
| 20 | Catalogue of Homogeneous Means in the UBV System |
| Mermilliod, J.C., Catalogue of Homogeneous Means in the UBV System, Institut d'Astronomie, Universite de Lausanne, 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 | |
| 35 | HD Extension Charts |
| Nesterev, V.V., Kuzmin, A.V., Ashimbaeva, N.T., Volchkov, A.A., Roser, S., Bastian, U., 1995 A&AS, 110, 367. "The Henry Draper Extension Charts: A catalogue of accurate positions, proper motions, magnitudes and spectral types of 86933 stars" | |
| 98 | SKYMAP Master Catalog Version 3.7 |
| Reference from Value 97 [original data sources Catalog Version 3.7 are identified in SKYMAP Version 3.7] | |
data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)
position and proper motion:
| position (B1950) | RA: 3h 46min 17.448sec | DEC: +38° 49' 49.79'' | ±0.028 arcsec |
| position (2000.74) | RA: 3h 49min 39sec | DEC: +38° 59' 4'' | JD: 2451813.20 |
| position (J2000) | RA: 3h 49min 36.532sec | DEC: +38° 58' 54.8'' | |
| proper motion B1950 (FK4) | RA: 0.0025 arcsec/a | DEC: -0.016 arcsec/a | ±0.013 arcsec/a in RA ±0.01 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0025 arcsec/a | DEC: -0.018 arcsec/a | |
| source of proper motion data | Determined by comparison of catalog and AGK1 | ||
magnitude:
| visual | 9 (accuracy: 1 decimal) |
| source of visual magnitude data | Determined by source catalog. |
| photographic | 9.2 (accuracy: 1 decimal) |
| source of photographic magnitude data | Determined by source catalog. |
spectral information:
| spectral class | A2 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | AGK2, Volume 7, catalogue number: 424 |
| Durchmusterung | BD+38 811 |
| Henry Draper Catalogue | 275877 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 3h 49.6min | DEC: +38° 59' |
| proper motion (J2000) | RA: -0.003 arcsec/a | DEC: -0.01 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 |
| - | 1904 | 21 | 74° | 1.3'' | 9.5 | 10.2 | A2IIv: | HU 1067 |
discoverer information:
| discoverer code | discoverer | reference |
| HU 1067 | Hussey, W.J. | - |
notes:
| note | A RW Aur-type variable, XY Per. Both components may vary. |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 3h 46min 17.4sec | DEC: +38° 49' 50'' |
variability informations:
| variability type | INA | eruptive variable star |
| magnitute at max. brightness | 9.8 | |
| magnitute at min. brightness | 11 | |
| photometric system | photographic magnitudes |
spectral information
| spectral class | A2II+B6e |
references
| to a study | Vol. III GCVS |
| to a chart/photograph | Vol. II GCVS |
miscanellous
| ID in the GCVS catalogue | 63/50 |
| constellation | Perseus |
| notes on existence | The star is equivalent to '0630051 XZ'. |
| There are notes in published catalog. | |
variability type description
| variability type | description |
| INA | Orion variables. Irregular, eruptive variables connected with bright or dark diffuse nebulae or observed in the regions of these nebulae. Some of them may show cyclic light variations caused by axial rotation. In the Spectrum-Luminosity diagram, they are found in the area of the main sequence and subgiants. They are probably young objects that, during the course of further evolution, will become light-constant stars on the zero-age main sequence (ZAMS). The range of brightness variations may reach several magnitudes. In the case of rapid light variations having been observed (up to 1 mag in 1-10 days), the letter "S" is added to the symbol for the type (INS). This type may be divided into the following subtypes: INA, INB, INT, IN(YY). INA Orion variables of early spectral types (B-A or Ae). They are often characterized by occasional abrupt Algol-like fadings (T Ori); INB Orion variables of intermediate and late spectral types, F-M or Fe-Me (BH Cep, AH Ori). F-type stars may show Algol-like fadings similar to those of many INA stars; K-M stars may produce flares along with irregular light variations; INT Orion variables of the T Tauri type. Stars are assigned to this type on the basis of the following (purely spectroscopic) criteria: spectral types are in the range Fe-Me. The spectra of most typical stars resemble the spectrum of the solar chromosphere. The feature specific to the type is the presence of the flourescent emission lines Fe II 4046, 4132 A (anomalously intense in the spectra of these stars), emission lines [Si II] and [O I], as well as the absorption line Li I 6707 A. These variables are usually observed only in diffuse nebulae. If it is not apparent that the star is associated with a nebula, the letter "N" in the symbol for the type may be omitted, e.g., IT (RW AUR); IN(YY) Some Orion variables (YY Ori) show the presence of absorption components on the redward sides of emission lines, indicating the infall of matter toward the stars' surfaces. In such cases, the symbol for the type may be accompanied by the symbol "YY". |