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Name
  CI Cyg  
AAVSO UID
000-BCJ-172 (55482 observations)  
Constellation
Cygnus Sequence
J2000.0
19 50 11.80 +35 41 03.0  (297.54917 +35.68417) Search nearby
B1950.0 19 48 20.61 +35 33 23.0
Galactic coord. 70.896 +4.742
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
AAVSO 1946+35 AN 10.1922 Downes CI Cyg
HIP 97594 HV 3625 Hen 3-1784
MWC 415 VV 172  
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Variability type
EA/GS+ZAND
Spectral type Bep+M5III
Mag. range
9.9 - 13.1 p
Discoverer --
Epoch
18 Jun 1891 (HJD 2411902) Ephemeris
Outburst --
Period 855.25 d
Rise/eclipse dur. 16%  (137 d)
Remarks
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1 GCVS Team d = 0.084P. Depth of eclipses ~0.8m. The eclipses of B star are observed. Usually there are light fluctuations near mean brightness ( ~12.1m). The outbursts last some dozens and hundreds days. Light curves [A.Puchinskas, Vilnyus Byull. N33, 50, 1972., M.Beyer, Bamb Ver 10, N120, 1976., M.I.Myalkovskij, Perem. Zvezdy Supplement 3, 71-91, 1977., T.S.Belyakina, in "Variable Stars and Stellar Evolution", IAU Symp N67, P.397, 1975.]. Emissions of H, He I, He II, [O III], and N III.
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References
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1 J. Alfonso-Garzon, A. Domingo, J.M. Mas-Hesse, A. Gimenez, 2012,
arXiv:1210.0821 [astro-ph.IM] (online info)		 2012arXiv1210.0821A
2 A. Skopal, S. Shugarov, M. Vanko, P. Dubovsky, S. P. Peneva, E. Semkov, M.
Wolf, 2012, arXiv:1203.4932v1 [astro-ph.SR]		 2012arXiv1203.4932S
3 R.A. Downes et al., 2001, PASP 113, 764 (2006 archival version) 2005JAD....11....2D
4 R.A. Downes et al., 2001, PASP 113, 764 2001PASP..113..764D
5 W.J.Miller, Ric Astr 7, N10, 1967. 1967RA......7..315M
6 L.H.Aller, Victoria Publ 9, N11, 1954. --
7 Guthnick, P.; et al., 1924, Benennung von neu entdeckten veränderlichen
Sternen		 1924AN....223...41G
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Supporting Documents
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Revision History
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4 Fernig, Leo 2023-07-05 21:37 UTC Discoverer updated from 1924AN....223...41G page 54.
3 Admin, VSX 2012-03-24 01:31 UTC Update from [2012arXiv1203.4932S].
2 Admin, VSX 2010-01-05 04:43 UTC Position updated from the GCVS version of November 2009.
1 Admin, VSX 2005-12-18 01:33 UTC Initial upload.

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