|
|
|
 Revise  New Search
|
|
Latest Details
|
|
|
Log in to retrieve additional aliases from SIMBAD. |
|
|
| Name |
U Cep |
|
|
| AAVSO UID |
|
| Constellation |
|
| J2000.0 |
|
| B1950.0 |
00 57 44.95 +81 36 24.2 |
| Proper motion |
| RA: 23.890 +/- 0.030 mas/y | Dec: -4.305 +/- 0.030 mas/y | Source: Gaia DR1 |
|
| Galactic coord. |
123.338 +19.012 |
Other names
(Internal only)
|
|
AAVSO 0053+81 |
ADS 830 A |
BD+81 25 |
|
HD 5679 |
HIP 4843 |
SAO 168 |
(Not logged in) Add name
|
| Variability type |
|
DPV:/EA |
|
|
| Spectral type |
B7Ve+G8III-IV |
| Mag. range |
|
6.75 - 9.24 V |
|
|
| Discoverer |
Vitold Ceraski (1880) |
| Epoch |
|
| Outburst |
-- |
| Period |
2.493087 d |
| Rise/eclipse dur. |
15% (8.98 h) |
|
|
|
|
Remarks
|
|
|
Some references may be clicked to view in new window. Roll over index number to view submission details.
|
|
|
|
1 |
Otero, Sebastian Alberto
|
Long period cycle varies (Mennickent, 2017). |
|
2 |
GCVS Team |
VB A (B 11.83m, 13.9", 62deg; C 12.3m, 23.0", 318deg). 0.010P <= d <= 0.040P. Min II 6.93. P var. Min I = 2407890.3346 + 2.4928551d*E + 5.15d*10**(-9)*E**2 (JD2388855 - 2440790) [M.A.Svechnikov, L.P.Surkova, V.M.Danilov, Perem. Zvezdy 18, N3, 237, 1971.]; analysis of period variations in this interval see also in [D.S.Hall, AA 25, N1, 1, 1975.]; Min I = 2441395.3604 + 2.4931048d*E (JD2440790 - 41600); Min I = 2441679.5716 + 2.4930432d*E (JD2441600 - 950); Min I = 2443753.7982 + 2.4930679d*E (JD2442100 - 43800); since JD2444000 - see Table. Shape of the light curve and depth of minima vary. Brightness of the secondary (G8) varies sporadically. Subgiant brightening accompanies eruptive mass transfer. The gaseous stream moving to the primary (B7) component forms around it gaseous ring or disc [E.C.Olson, ApJ 250, 704, 1981.]. |
|
|
|
|
(Not logged in) Add remark
|
|
|
|
References
|
|
|
Click reference title/citation to view in new window. Roll over index number to view submission details.
|
|
|
|
1 |
Mennickent, R. E., 2017, Long photometric cycles in hot Algols (Invited
review) |
-- |
|
2 |
E.C.Olson, R.C.Crawford, D.S.Hall, H.Louth, N.L.Markworth, V.Piirola, PASP
93, 464, 1981. |
1981PASP...93..464O |
|
3 |
Cannon, A. J., 1907, Second catalogue of variable stars |
1907AnHar..55....1C |
|
4 |
J.G.Hagen, ASV IV, 1907. |
-- |
|
|
|
|
|
|
External Links
|
|
|
Links open in a new window. Not all links may be valid for this particular target.
|
|
|
|
Location
|
Go
|
Select a Location for more details.
|
|
|
|
|
Catalog Data
|
|
|
Information from selected catalogs obtained by cross-matching to 2 arc seconds using the CDS X-Match Service. These data may not be complete.
|
|
2MASS
|
J = 6.47 | H = 6.36 | K = 6.25 | J - K = 0.22 |
|
AllWISE
|
W1 = 6.22 | W2 = 6.28 | W3 = 6.30 | W4 = 6.18 | W1 - W2 = -0.06 | W3 - W4 = 0.11 |
|
APASS-DR9
|
B = 8.51 | V = 6.96 | g' = 8.65 | r' = 7.06 | i' = 7.20 | B - V = 1.55 |
|
|
|
|
Images
|
|
|
Please review Digitized Sky Survey Acknowledgment and Copyright.
|
|
|
|
|
|
|
|
Supporting Documents
|
|
|
|
|
There are currently no supporting documents on file for this star.
|
(Not logged in) Add document
|
|
|
|
|
Revision History
|
|
|
Currently approved revision is checked. Click revision number to view details of that revision.
|
|
|
|
|
