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  AM CVn  
000-BCV-012 (349188 observations)  
Canes Venatici Sequence
12 34 54.59 +37 37 43.4  (188.72746 +37.62872) Search nearby
B1950.0 12 32 28.45 +37 54 14.8
Galactic coord. 140.235 +78.938
Other names

(Internal only)
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AAVSO 1229+38 Downes AM CVn EGGR 91
PG 1232+379 X 12324+379  
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Variability type
Spectral type DBp
Mag. range
14.1 - 14.18 V
Discoverer --
08 Mar 1978 (HJD 2443575.72125) Ephemeris
Outburst --
Period 0.01216609 d  (17.51917 min)
Rise/eclipse dur. --
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1 GCVS Team The light curve is a double wave. Min II sometimes disappears. The depth of Min I changes also. Epoch of Min I is given in the Table. P var; dP/dt = +0.012s per year. Elements for 1978 are given in the Table. The brightness fluctuates with the cycle of 115 - 120s, sometimes the periodicity with P = 26.3s is observed. Probably it is a close binary semidetached system of two white dwarfs with an accretion disk and a hot spot.
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Click reference title/citation to view in new window. Roll over index number to view submission details.
1 Gaia Collaboration; et al., 2018, Gaia Data Release 2. Summary of the
contents and survey properties
2 Light curve from CRTS/CSS (Drake et al. 2009, ApJ, 696, 870) 2009ApJ...696..870D
3 Kinematics of the ultracompact helium accretor AM Canum Venaticorum 2006MNRAS.371.1231R
4 R.A.Downes, 2001, PASP 113, 764 (2006 archival) 2005JAD....11....2D
5 R.A. Downes et al., 2001, PASP 113, 764 2001PASP..113..764D
6 J.Patterson, R.E.Nather, E.L.Robinson, F.Handler, ApJ 232,819, 1979. 1979ApJ...232..819P
7 J.Smak, AA 17, 255, 1967. 1967AcA....17..255S
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Revision History
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4 Otero, Sebastian Alberto 2020-05-14 19:56 UTC Gaia DR2 position.
3 Otero, Sebastian Alberto 2011-02-14 18:32 UTC Primary record creation. Orbital period from reference. Type from Downes (2001). Range from CTRS light curve. UCAC3 position.
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.