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Latest Details
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| Name |
AM Her |
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| AAVSO UID |
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| Constellation |
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| J2000.0 |
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| B1950.0 |
18 14 58.81 +49 50 55.3 |
| Proper motion |
| RA: -46.3 +/- 3.8 mas/y | Dec: 27.0 +/- 0.6 mas/y | Source: UCAC4 |
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| Galactic coord. |
77.865 +25.876 |
Other names
(Internal only)
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Please note that aliases shown in grey link to obsolete records.
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1RXS J181613.8+495203 |
2MASS J18161324+4952048 |
AAVSO 1813+49 |
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AN 28.1923 |
ASASSN-V J181613.06+495204.8 |
Downes AM Her |
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NSVS J1816133+495205 |
ROTSE1 J181613.28+495205.0 |
TIC 366122523 |
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UCAC4 700-061864 |
WISEA J181613.20+495205.0 |
X 18149+498 |
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ZTF J181613.16+495205.3 |
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| Variability type |
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AM+E |
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| Spectral type |
pec+M4.5V |
| Mag. range |
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12.3 - 15.7 V |
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| Discoverer |
Maximilian Wolf (1924) |
| Epoch |
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| Outburst |
-- |
| Period |
0.12892713 d (3.094251 h) |
| Rise/eclipse dur. |
-- |
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Remarks
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Some references may be clicked to view in new window. Roll over index number to view submission details.
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1 |
GCVS Team |
Ã??U 1809 +50. Lx(soft)/Lopt ~15. Emissions of H and KCaII, H, HeI, HeII, etc. In the spectrum. Epoch of Min I in V light is given. The period shows complex variations. The phase of Min I in U light is 0.30p, in B 0.15P, in R 0.05P. Min I is probably due to an eclipse of a hot spot and the gas flow near the surface of the white dwarf by the white dwarf itself. The depth of Min I is up to 0.7m. Min II with the depth up to 0.4m (sometimes absent), Min II - Min I = 0.55P. Min II coincides in phase with the X-ray eclipse. High and low states (b ~13.0m and B ~15.0m on average); in the high state there are variations with Delta(m) ~0.3m on the time scale >= 200d; the duration of low states is 130d - 700d [R.Hudec, L.Meinunger, MVS 7, H.8, 194, 1977.] or less. During low states the depth of minima is small. Flickering up to 0.8mV in several minutes or dozens of seconds; X-ray flickering on the time scale of ~10s not correlating with optical flickering. The magnetic field ~1*10**7 G at the equator, ~2*10**7 G on poles. Variable circular (from +3% to -9%) and linear (up to 7%) polarization. IR excess at lambda 10 mkm. |
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References
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Click reference title/citation to view in new window. Roll over index number to view submission details.
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1 |
ZTF Catalog of Periodic Variable Stars (online data) |
2020arXiv200508662C |
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2 |
Chen, X.; et al., 2020, The Zwicky Transient Facility Catalog of Periodic
Variable Stars |
2020arXiv200508662C |
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3 |
Light curve from CRTS/CSS (Drake et al. 2009, ApJ, 696, 870) |
2009ApJ...696..870D |
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4 |
R.A. Downes et al., 2001, PASP 113, 764 (2006 archival version) |
2005JAD....11....2D |
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5 |
R.A. Downes et al., 2001, PASP 113, 764 |
2001PASP..113..764D |
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6 |
C.Akerlof et al., AJ 119, 1901, 2000. |
2000AJ....119.1901A |
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7 |
P.Szkody, D.E.Brownlee, ApJ 212, L 113, 1977. |
1977ApJ...212L.113S |
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8 |
W.Liller, Sky and Tel 53, N5, 351, 1977. |
-- |
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9 |
Guthnick, P.; et al., 1924, Benennung von neu entdeckten veränderlichen
Sternen |
1924AN....223...41G |
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External Links
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Location
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Catalog Data
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Information from selected catalogs obtained by cross-matching to 2 arc seconds using the CDS X-Match Service. These data may not be complete.
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2MASS
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J = 11.70 | H = 11.20 | K = 11.00 | J - K = 0.70 |
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AllWISE
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W1 = 10.54 | W2 = 10.17 | W3 = 9.04 | W4 = 7.98 | W1 - W2 = 0.38 | W3 - W4 = 1.06 |
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APASS-DR9
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B = 15.12 | V = 14.81 | g' = 14.93 | r' = 14.62 | i' = 14.17 | B - V = 0.32 |
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GALEX-DR5
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FUV = 14.65 | NUV = 14.97 | FUV - NUV = -0.33 |
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Images
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Supporting Documents
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Campaigns/Programs
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Legacy CVs
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Revision History
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Currently approved revision is checked. Click revision number to view details of that revision.
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