EP Lyrae
catalogues and names
| catalogues and names | EP Lyr |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 19h 16min 17sec | DEC: +27° 45' 6'' | ± 1 sec / ± 0.1 arcmin |
variability informations:
| variability type | RVB | pulsating variable star |
| magnitute at max. brightness | 9.96 | |
| magnitute at min. brightness | 10.9: | |
| photometric system | visual, photovisual or Johnson's V | |
| epoch for maximum light [JD] | 2427009 28. October 1932, 12:00:00 UT |
|
| period [d] | 83.34 | |
| next maximum light [JD] | 2451844.32 26. October 2000, 19:40:48 UT |
|
| rising time | 18 % of period |
spectral information
| spectral class | A4Ib-G5p |
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 | 52/159 |
| constellation | Lyra |
| notes on existence | The star is equivalent to '0520160 EQ'. |
| There are notes in published catalog. | |
variability type description
| variability type | description |
| RVB | Variables of the RV Tauri type. These are radially pulsating supergiants having spectral types F-G at maximum light and K-M at minimum. The light curves are characterized by the presence of double waves with alternating primary and secondary minima that can vary in depth so that primary minima may become secondary and vice versa. The complete light amplitude may reach 3-4 mag in V. Periods between two adjacent primary minima (usually called formal periods) lie in the range 30-150 days (these are the periods appearing in the Catalogue). Two subtypes, RVA and RVB, are recognized: RVA RV Tauri variables that do not vary in mean magnitude (AC Her); RVB RV Tauri variables that periodically (with periods from 600 to 1500 days and amplitudes up to 2 mag in V) vary in mean magnitude (DF Cyg, RV Tau). |