The two accretion states of the polar 1RXS J184542 in 2012
We present the photometric investigation of the newly discovered magnetic cataclysmic variable (polar) 1RXS J184542 during four months in 2012. We used the CCD observations in R-band obtained with the 0.5-m ARCSAT telescope at the Apache Point Observatory. It was found that during this time the obje...
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Головна астрономічна обсерваторія НАН України
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| Zitieren: | The two accretion states of the polar 1RXS J184542 in 2012 / A.V. Shchurova, E.P. Pavlenko, V.P. Malanushenko // Advances in Astronomy and Space Physics. — 2013. — Т. 3., вип. 2. — С. 79-80. — Бібліогр.: 2 назв. — англ. |
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irk-123456789-1196242017-06-08T03:07:16Z The two accretion states of the polar 1RXS J184542 in 2012 Shchurova, A.V. Pavlenko, E.P. Malanushenko, V.P. We present the photometric investigation of the newly discovered magnetic cataclysmic variable (polar) 1RXS J184542 during four months in 2012. We used the CCD observations in R-band obtained with the 0.5-m ARCSAT telescope at the Apache Point Observatory. It was found that during this time the object changed its relatively high accretion state to the low one. There was a two-pole accretion at the high state and one-pole accretion at the low state. 2013 Article The two accretion states of the polar 1RXS J184542 in 2012 / A.V. Shchurova, E.P. Pavlenko, V.P. Malanushenko // Advances in Astronomy and Space Physics. — 2013. — Т. 3., вип. 2. — С. 79-80. — Бібліогр.: 2 назв. — англ. 2227-1481 http://dspace.nbuv.gov.ua/handle/123456789/119624 en Advances in Astronomy and Space Physics Головна астрономічна обсерваторія НАН України |
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We present the photometric investigation of the newly discovered magnetic cataclysmic variable (polar) 1RXS J184542 during four months in 2012. We used the CCD observations in R-band obtained with the 0.5-m ARCSAT telescope at the Apache Point Observatory. It was found that during this time the object changed its relatively high accretion state to the low one. There was a two-pole accretion at the high state and one-pole accretion at the low state. |
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Article |
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Shchurova, A.V. Pavlenko, E.P. Malanushenko, V.P. |
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Shchurova, A.V. Pavlenko, E.P. Malanushenko, V.P. The two accretion states of the polar 1RXS J184542 in 2012 Advances in Astronomy and Space Physics |
| author_facet |
Shchurova, A.V. Pavlenko, E.P. Malanushenko, V.P. |
| author_sort |
Shchurova, A.V. |
| title |
The two accretion states of the polar 1RXS J184542 in 2012 |
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The two accretion states of the polar 1RXS J184542 in 2012 |
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The two accretion states of the polar 1RXS J184542 in 2012 |
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The two accretion states of the polar 1RXS J184542 in 2012 |
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The two accretion states of the polar 1RXS J184542 in 2012 |
| title_sort |
two accretion states of the polar 1rxs j184542 in 2012 |
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Головна астрономічна обсерваторія НАН України |
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2013 |
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http://dspace.nbuv.gov.ua/handle/123456789/119624 |
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The two accretion states of the polar 1RXS J184542 in 2012 / A.V. Shchurova, E.P. Pavlenko, V.P. Malanushenko // Advances in Astronomy and Space Physics. — 2013. — Т. 3., вип. 2. — С. 79-80. — Бібліогр.: 2 назв. — англ. |
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Advances in Astronomy and Space Physics |
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AT shchurovaav thetwoaccretionstatesofthepolar1rxsj184542in2012 AT pavlenkoep thetwoaccretionstatesofthepolar1rxsj184542in2012 AT malanushenkovp thetwoaccretionstatesofthepolar1rxsj184542in2012 AT shchurovaav twoaccretionstatesofthepolar1rxsj184542in2012 AT pavlenkoep twoaccretionstatesofthepolar1rxsj184542in2012 AT malanushenkovp twoaccretionstatesofthepolar1rxsj184542in2012 |
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2025-07-08T16:17:23Z |
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1837096180465532928 |
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The two accretion states of the polar 1RXS J184542 in 2012
A.V. Shchurova1∗, E. P. Pavlenko2, V. P.Malanushenko3
Advances in Astronomy and Space Physics, 3, 79-80 (2013)
© A.V. Shchurova, E. P. Pavlenko, V. P.Malanushenko, 2013
1Taurida National V. I. Vernadsky University, Simferopol, Ukraine
2Crimean Astrophysical Observatory, Taras Shevchenko National University of Kyiv, Nauchny, Ukraine
3Apache Point Observatory, New Mexico, USA
We present the photometric investigation of the newly discovered magnetic cataclysmic variable (polar) 1RXS
J184542 during four months in 2012. We used the CCD observations in R-band obtained with the 0.5-m ARCSAT
telescope at the Apache Point Observatory. It was found that during this time the object changed its relatively
high accretion state to the low one. There was a two-pole accretion at the high state and one-pole accretion at the
low state.
Key words: stars: close binaries, cataclysmic variables, polars, 1RXS J184542
introduction
Magnetic cataclysmic variables (CVs) are close bi-
nary systems at the late stage of evolution. They
consist of the late type component which loses its
matter onto the magnetic white dwarf via inner La-
grangian point.
The majority of magnetic CVs has been dis-
covered via their strong X-ray emission. The X-
ray source 1RXS J184542.4+483134 (USNO-B1.0
1385-0291789 18:45:42.622 +48:31:30.84, J2000) was
identi�ed as magnetic eclipsing CV using optical
observations at the Crimean Astrophysical Obser-
vatory and X-ray Swift observations [1]. Before
that Denisenko and Smirnov [2] believed that 1RXS
J184542.4+483134 is non-magnetic CV with strong
re�ection e�ect.
observations and results
In our research the photometric investigation of
the newly found magnetic cataclysmic variable (po-
lar) 1RXS J184542 is presented. The CCD R obser-
vations were obtained with 0.5-m ARCSAT telescope
of the Apache Point Observatory. The reference star
USNO-B1.0 1385-0291764 (R = 17m.4) was used.
The photometry was conducted from 10.02.2012
to 27.05.2012. The total exposure of observations
was about 47.5 hrs (see Journal of observations in
Table 1 and Table 2).
During this time the object was discovered to
change its relatively high accretion state to the low
one. Its brightness varied from 17m.6 to 20m.4 at
high state and from 18m.1 to 21m at low state. The
transition from high state to the low one occurred
within eight days (see Fig. 1).
We calculated the phases of 1RXS J184542 using
ephemeris [1] as:
HJD = 2455684.5149 + 0.054908 · E,
where E is the number of epochs.
The mean phased curves for the high and low
states are shown in Fig. 2. It is evident that the
mean lightcurve for the high state has smooth long-
term brightness increase during the 0.6P and more
rapid decline during 0.4P. The mean light curve for
the low state has sharply de�ned pro�le with dura-
tion ∼ 0.6P.
Comparing the lightcurves for these two states
we could conclude that there was the two-pole ac-
cretion at high state: the radiation from the second
pole superposed on the radiation from the �rst pole
producing the pro�le asymmetry described above.
conclusion
Here we present for the �rst time the evidences of
the high and low state of 1RXS J184542 which were
accompanied by the two-pole and one-pole accretion.
references
[1] PavlenkoE., SokolovskyK., BaklanovA. et al. 2011, The
Astronomer's Telegram, #3436
[2] DenisenkoD. & SmirnovE. 2011, Peremennye Zvezdy
Prilozheni, 11, 10
∗alisa-katya@mail.ru
79
Advances in Astronomy and Space Physics A.V. Shchurova, E. P. Pavlenko, V. P.Malanushenko
2455960 2455980 2456000 2456020 2456040 2456060 2456080
20,0
19,8
19,6
19,4
19,2
19,0
18,8
18,6
18,4
18,2
M
ag
ni
tu
de
(R
)
JD
Fig. 1: The long-term light curve.
0,0 0,2 0,4 0,6 0,8 1,0 1,2 1,4 1,6 1,8 2,0
22
21
20
19
18
M
ag
ni
tu
de
(R
)
Phase
low state
high state
Fig. 2: The mean phased curves.
Table 1: Journal of observations. High state.
date number HJD HJD mean standard max min
of image (start) (end) magnitude error magnitude magnitude
10.02.2012 15 2455967.96234 2455968.03946 18.773 0.17 17.654 19.851
16.02.2012 18 2455973.95273 2455974.02855 18.627 0.128 17.809 19.67
25.02.2012 18 2455982.92617 2455983.01302 18.588 0.156 17.72 19.661
01.03.2012 23 2455987.92178 2455988.01975 18.589 0.13 17.699 19.521
03.03.2012 22 2455989.91063 2455990.00554 18.547 0.113 17.715 19.743
04.03.2012 23 2455990.91082 2455991.01617 18.572 0.113 17.843 19.561
17.03.2012 29 2456003.87793 2456004.00258 18.823 0.109 17.794 19.945
22.03.2012 30 2456008.86370 2456008.99330 19.25 0.121 18.132 20.408
23.03.2012 28 2456009.87502 2456009.99550 18.74 0.102 17.864 19.656
24.03.2012 34 2456010.85040 2456010.99994 18.738 0.115 17.718 19.987
25.03.2012 30 2456011.86680 2456011.99584 18.612 0.112 17.606 19.821
Table 2: Journal of observations. Low state.
date number HJD HJD mean standard max min
of image (start) (end) magnitude error magnitude magnitude
02.04.2012 30 2456019.83394 2456019.97717 19.763 0.107 18.869 20.893
12.04.2012 37 2456029.79331 2456029.99744 19.676 0.11 18.252 20.811
19.04.2012 29 2456036.84450 2456036.97496 19.433 0.116 18.408 20.55
21.04.2012 25 2456038.85134 2456038.96711 19.704 0.143 18.685 20.97
23.05.2012 19 2456070.84379 2456070.95032 19.718 0.161 18.122 20.659
27.05.2012 16 2456074.86609 2456074.95517 19.768 0.164 18.797 20.764
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