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Name
AM CVn
AAVSO UID
Constellation
J2000.0
B1950.0
12 32 28.37 +37 54 14.6
Proper motion
RA: 27.4 +/- 1.2 mas/y Dec: 18.2 +/- 1.4 mas/y Source: UCAC4
Galactic coord.
140.234 +78.938
Other names(Internal only)
Please note that aliases shown in grey link to obsolete records.
AAVSO 1229+38
Downes AM CVn
EGGR 91
PG 1232+379
X 12324+379
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Variability type
IBWD
Spectral type
DBp
Mag. range
14.0 - 14.4 CV
Discoverer
--
Epoch
Outburst
--
Period
0.01190662 d (17.14553 min)
Rise/eclipse dur.
--
Remarks
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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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References
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1
Gaia Collaboration; et al., 2018, Gaia Data Release 2. Summary of the
2018A&A...616A...1G
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
External Links
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Location
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AAVSO Variable Star Plotter
AAVSO Light Curve
AAVSO WebObs
APASS
AAVSOnet EPD
SIMBAD
SIMBAD Clickable Map
SIMBAD Coordinate query
VizieR Search
Aladin Java Applet
CDS Portal
CDS Biblio
SDSS Navigate Tool
GCVS
Downes
ASAS-SN Sky Patrol
NSVS
CRTS
ZTF
SuperWASP
Pan-STARRS1 Data
Pan-STARRS1 Images
SkyMorph
Kamogata Wide-field Survey (KWS)
Go
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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 = 14.48 H = 14.44 K = 14.65 J - K = -0.16
AllWISE
W1 = 14.55 W2 = 14.64 W1 - W2 = -0.09
APASS-DR9
B = 13.91 V = 14.08 g' = 13.85 r' = 14.22 i' = 14.57 B - V = -0.17
GALEX-DR5
FUV = 13.43 NUV = 13.89 FUV - NUV = -0.46
SDSS-DR12
u = 13.66 g = 14.23 r = 14.26 i = 17.96 z = 14.80 u - g = -0.57 r - i = -3.70
Images
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Supporting Documents
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Revision History
Currently approved revision is checked. Click revision number to view details of that revision.
4
Otero, Sebastian Alberto
2020-05-14 23:56 UTC
Gaia DR2 position.
3
Otero, Sebastian Alberto
2011-02-14 23:32 UTC
Primary record creation. Orbital period from reference. Type from Downes (2001). Range from CTRS light curve. UCAC3 position.
2
Admin, VSX
2010-01-05 04:43 UTC
Position updated from the GCVS version of November 2009.
1
Admin, VSX
2005-12-18 01:33 UTC
Initial upload.
