V1968 Cygni
catalogues and names
| catalogues and names | V1968 Cyg |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 19h 59min 25sec | DEC: +40° 47' 12'' | ± 1 sec / ± 0.1 arcmin |
variability informations:
| variability type | M | pulsating variable star |
| magnitute at max. brightness | 1.2 | |
| magnitute at min. brightness | 3.2 | |
| photometric system |
references
| to a study | T.J.Jones, C.O.Bryja, R.D.Gehrz, T.E.Harrison, J.J.Johnson, D.I.Klebe, G.F.Lawrence, ApJ Suppl 74, No.3, 785, 1990. |
miscanellous
| ID in the GCVS catalogue | 31/1968 |
| constellation | Cygnus |
| notes on existence | The star is equivalent to '71400'. |
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). |