2001A&A...372..945K


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.23CEST06:03:00

2001A&A...372..945K - Astronomy and Astrophysics, volume 372, 945-951 (2001/6-4)

UBVRI-polarimetry of the AM Herculis star RX J0203.8+2959.

KATAJAINEN S., SCALTRITI F., PIIROLA V., LEHTO H.J. and ANDERLUCCI E.

Abstract (from CDS):

We present results of the first simultaneous UBVRI-photopolarimetric observations of the long period (4.6 hrs) AM Herculis system RX J0203.8+2959. The observed circular polarization shows both negative and positive polarization, from +7% to -5% in the B-band. A rise of the positive circular polarization is observed near the same orbital phase as a change in HR1 hardness ratio from soft to hard in the earlier ROSAT X-ray observations. The negative circular polarization is observed near orbital phases where a soft X-ray component was seen in ROSAT observations. Linear polarization pulses coincide with the sign reversal of the circular polarization, and coincide also with changes in the X-ray hardness ratio in earlier ROSAT data. The observed polarization variations favour two-pole accretion. Least square fits to the position angle curves during linear pulses suggest high orbital inclination, estimates from i=67°+21–24 to i=73°+13–15. The UBVRI-lightcurves show smooth variations with a broad maximum and minimum. RX J0203.8+2959 was in intermediate accretion state during observations in November 1998 (V=15.7-16.7). The observed flux and circular polarization variations are reproduced by using constant temperature cyclotron emission models having two accretion regions and with parameters: kT=10keV, Λ=105 and colatitude β=120°-140° for the negative pole, and kT=20keV, Λ=104 and β=20°-30° for the main accreting positive pole, and assuming orbital inclination i∼70°.

Abstract Copyright:

Journal keyword(s): stars: magnetic fields - novae, cataclysmic variables - stars: individual: RX J0203.8+2959 - accretion, accretion disks - polarization

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 V* BL Hyi NL* 01 41 00.3995669445 -67 53 27.469105974   14.9       Am 198 0
2 V* AI Tri AM* 02 03 48.6152251668 +29 59 25.898735063           M2.5 39 1
3 V* UZ For AM* 03 35 28.6515678221 -25 44 21.765602833   18.2       M4.5 242 0
4 V* V1309 Ori AM* 05 15 41.4123841919 +01 04 40.479107028           M0.5 97 0
5 V* VV Pup AM* 08 15 06.8010742098 -19 03 17.765651066     13.90     M7V 383 0
6 V* ST LMi AM* 11 05 39.7662126421 +25 06 28.744817170   15.10       DAH+M 208 0
7 V* DP Leo AM* 11 17 15.9238061197 +17 57 41.680410866           ~ 205 1
8 V* EV UMa AM* 13 07 53.8583243765 +53 51 30.498937628           ~ 59 0
9 V* V895 Cen CV* 14 29 27.1968999776 -38 04 09.582441495           ~ 36 0
10 V* V2301 Oph NL* 18 00 35.5318080632 +08 10 13.920659251           ~ 87 0
11 V* AM Her AM* 18 16 13.2546541781 +49 52 04.759861155     12.30     M4.5 905 0
12 V* V347 Pav AM* 18 44 48.2635326025 -74 18 34.218756613           ~ 57 0
13 V* QS Tel AM* 19 38 35.8145594082 -46 12 57.107614734           ~ 110 0

    Equat.    Gal    SGal    Ecl

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2019.10.23-06:03:00

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