2002A&A...392..505S


Query : 2002A&A...392..505S

2002A&A...392..505S - Astronomy and Astrophysics, volume 392, 505-514 (2002/9-3)

A new two-pole accretion polar: RX J1846.9+5538.

SCHWARZ R., GREINER J., TOVMASSIAN G.H., ZHARIKOV S.V. and WENZEL W.

Abstract (from CDS):

We report the discovery of a new, bright (V∼17m) AM Her system as the optical counterpart of the soft ROSAT All-Sky-Survey source RX J1846.9+5538 (=1RXS J184659.4+553834). Optical photometric and spectroscopic follow-up observations reveal a single period of 128.7min, consistent with a high degree of spin-orbit synchronization, and a low polar field strength (B<20MG) of the primary accretion region. The system was observed in optical intermediate and high states that differ by about 1 mag. These brightness variations were accompanied by a correlated change of the optical light curve, which we interpret as a switch between one- and two-pole accretion. This explanation is also supported by the X-ray light curves, which at two different epochs display emission from two equally bright accretion regions separated by ∼160°. Both spots possess distinct spectral X-ray properties as seen from the X-ray hardness ratio, where the secondary accretion region appears significantly softer, thus probably indicating a higher field strength compared to the primary region. In all ROSAT pointings a deep dip is present during the primary flux maxima, very likely caused by absorption in one of the accretion streams.

Abstract Copyright:

Journal keyword(s): X-rays: stars - cataclysmic variables - accretion - stars: magnetic fields - stars: individual: RX J1846.9+5538

CDS comments: V844 Her is a misprint for V884 Her.

Simbad objects: 17

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Number of rows : 17
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 V* BL Hyi CV* 01 41 00.3996430344 -67 53 27.470100660   14.9       Am 210 0
2 V* UZ For CV* 03 35 28.6518733656 -25 44 21.768755424           M4.5 267 0
3 V* RS Cae CV* 04 53 25.5511419734 -42 13 39.629891111           Am 37 0
4 V* VV Pup CV* 08 15 06.8009599464 -19 03 17.765706024     13.90     M7V 399 0
5 V* WX LMi CV* 10 26 27.4933431861 +38 45 02.655728034   18   16.77   M7 52 0
6 V* ST LMi CV* 11 05 39.7664319408 +25 06 28.746723096   16.832 16.524 15.639   DAH+M 220 0
7 V* DP Leo CV* 11 17 15.9239894616 +17 57 41.690453220           ~ 228 1
8 V* V844 Her CV* 16 25 01.7475368040 +39 09 26.359853904       16.2   ~ 64 0
9 V* V1007 Her CV* 17 24 06.2894436024 +41 14 07.681501044           ~ 24 0
10 V* V884 Her CV* 18 02 06.4848200016 +18 04 43.839425568   13.315 13.382 14.753   ~ 57 0
11 V* AM Her Mi* 18 16 13.2546541781 +49 52 04.759861155   15.124 14.808 13.525   M4.5-5Ve 968 0
12 V* MT Dra RS* 18 46 58.7968849152 +55 38 28.771274508   20.4   19.4   ~ 25 0
13 USNO-A2.0 1425-09302300 * 18 46 59.8040371656 +55 38 37.510676988   16.6       ~ 1 0
14 V* EP Dra CV* 19 07 06.1869434379 +69 08 43.874477499   18       ~ 64 0
15 V* QS Tel CV* 19 38 35.8144163880 -46 12 57.106344420           ~ 115 0
16 V* HU Aqr CV* 21 07 58.1944529400 -05 17 40.557671916   16.198 15.814 14.891   D+M4V 274 1
17 V* CP Tuc CV* 23 15 19.0034090472 -59 10 29.129147076           ~ 37 0

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