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Name
  XZ Cyg  
AAVSO UID
000-BCH-041 (91264 observations)  
Constellation
Cygnus Sequence
J2000.0
19 32 29.31 +56 23 17.5  (293.12212 +56.38819) Search nearby
B1950.0 19 31 27.42 +56 16 47.2
Proper motion
RA: 84.304 +/- 0.096 mas/yDec: -24.485 +/- 0.101 mas/ySource: Gaia DR1
Galactic coord. 88.215 +16.976
Other names

(Internal only)
1SWASP J193229.30+562317.5 AAVSO 1930+56 AN 76.1905
BD+56 2257 HD 239124 HIP 96112
SAO 31761    
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Variability type
RRAB/BL
Spectral type A5-F5
Mag. range
8.9 - 10.16 V
Discoverer L. Ceraski (31 May 1905)
Epoch
07 Sep 1979 (HJD 2444124.44) Ephemeris
Outburst --
Period 0.4666 d  (11.20 h)
Rise/eclipse dur. --
Remarks
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1 GCVS Team [Fe/H] = -1.2. P var. Max = 2417201.241 + 0.4665878*E - 0.000107d*10**(-6)*E**2 (JD2414000 - 35000) [L.A.Klepikova, Perem. Zvezdy 12, N3, 164, 1959.]; Max = 2438562.796 + 0.466570d*E (JD2434000 - 39800); Max = 2440445.789 + 0.466497d*E (JD2439800 - 41000) [G.A.Lange, P.P.Gusev, Perem. Zvezdy Supplement 1, N5, 333, 1972.]; Max = 2441453.3856 + 0.4664731d*E (JD2441000 - 42500) [V.Pop, IBVS N990, 1975.]; Max = 2443028.641 + 0.466438d*E (JD2442500 - 43800) [P.O.Taylor, JAAVS 07, N2, 82, 1978-79.]; Max = 2444142.650 + 0.466649d*E (JD2443800 - 44200) [P.O.Taylor, JAAVS 08, N1, 1, 1979.]; since JD2444100 - see Table. Besides that the star has a strongly expressed Blazhko effect; the period of Blazhko effect varies, too [V.Pop, IBVS N990, 1975., P.Kunchev, IBVS N927, 1974.]. 0.13P <= M - m <= 0.22P; 0.90m <= A(B) <= 1.70m, 0.70m <= A(B) <= 1.30m; -0.05P < O - C < +0.05; Max A = 2417025.5 + 57.401d*E (JD2417000 - 38500); Max A = 2438881.7 + 58.387d*E (since JD2438500).[H.A.Smith, PASP 87, N517, 465, 1975.]. After JD2444000 Blazhko effect period probably decreased to 56.3d [P.O.Taylor, JAAVS 08, N1, 1, 1979.].
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References
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1 Greer, P. A.; Payne, S. G.; Norton, A. J.; et al., 2017, The SuperWASP
catalogue of 4963 RR Lyr stars: identification of 983 Blazhko effect
candidates
2017A&A...607A..11G
2 D.M. Bramich, K.A. Alsubai, A. Arellano Ferro et al., 2014, IBVS 6106 2014IBVS.6106....1B
3 General Catalogue of Variable Stars, 4th Edition, Volumes I-III, P.N.
Kholopov et al.
--
4 V.P.Zessewitsch, Variable Stars and Methods of Their Studies, (in russian)
M., 1970.
--
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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 = 9.17H = 8.96K = 8.88J - K = 0.28
AllWISE W1 = 8.63W2 = 8.64W3 = 8.56W4 = 8.10W1 - W2 = -0.01W3 - W4 = 0.47
APASS-DR9 B = 10.59V = 10.05g' = 10.38r' = 9.97i' = 9.88B - V = 0.53
Images
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Supporting Documents
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Revision History
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6 Billiaert, Bruno 2015-12-29 10:12 UTC date of discovery
5 Billiaert, Bruno 2015-12-28 11:03 UTC discoverer added (1905AN....168..323C)
4 Admin, VSX 2015-12-18 21:46 UTC Updated variability type to indicate Blazhko effect.
3 Admin, VSX 2014-07-30 22:00 UTC Update from [2014IBVS.6106....1B].
2 Admin, VSX 2010-01-04 23:43 UTC Position updated from the GCVS version of November 2009.
1 Admin, VSX 2005-12-17 20:33 UTC Initial upload.