2005A&A...439..213P


Query : 2005A&A...439..213P

2005A&A...439..213P - Astronomy and Astrophysics, volume 439, 213-225 (2005/8-3)

X-ray orbital modulations in intermediate polars.

PARKER T.L., NORTON A.J. and MUKAI K.

Abstract (from CDS):

We present an analysis of 30 archival ASCA and RXTE X-ray observations of 16 intermediate polars to investigate the nature of their orbital modulation. We show that X-ray orbital modulation is widespread amongst these systems, but not ubiquitous as indicated by previous studies that included fewer objects. Only seven of the sixteen systems show a clearly statistically significant modulation depth whose amplitude decreases with increasing X-ray energy. Interpreting this as due to photoelectric absorption in material at the edge of an accretion disc would imply that such modulations are visible for all system inclination angles in excess of 60 degrees. However, it is also apparent that the presence of an X-ray orbital modulation can appear and disappear on a timescale of ∼years or months in an individual system. This may be evidence for the presence of a precessing, tilted accretion disc, as inferred in some low mass X-ray binaries.

Abstract Copyright:

Journal keyword(s): stars: novae, cataclysmic variables - X-rays: stars - stars: magnetic fields - stars: binaries: close

CDS comments: In Table 1 V2036 Cyg is a misprint for V2306 Cyg

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* V709 Cas CV* 00 28 48.8267393856 +59 17 22.033767228     14.01     ~ 119 0
2 V* XY Ari CV* 02 56 08.185 +19 26 34.12           ~ 147 1
3 V* V1062 Tau CV* 05 02 27.4778229096 +24 45 23.157957240           ~ 65 0
4 V* TV Col CV* 05 29 25.5292422792 -32 49 03.900212364   14.219 13.846 14.181   K2V 317 0
5 V* TX Col CV* 05 43 20.17 -41 01 54.3   14.5       ~ 146 0
6 V* V405 Aur CV* 05 57 59.2934496792 +53 53 44.926489464           ~ 120 0
7 V* BG CMi CV* 07 31 29.0079060264 +09 56 23.030740248   14.5       ~ 213 0
8 V* PQ Gem CV* 07 51 17.3280306912 +14 44 23.874868716           ~ 214 0
9 V* DO Dra CV* 11 43 38.4921265896 +71 41 20.559036192       13.747   DQ 208 1
10 V* V1025 Cen CV* 12 38 16.3191432264 -38 42 45.836441856   15.20       ~ 67 0
11 V* EX Hya CV* 12 52 24.2222471899 -29 14 55.999766523   13.51 13.49 13.55   M5-6V 673 0
12 V* V2400 Oph CV* 17 12 36.4233668016 -24 14 44.773987164     14.5     ~ 143 0
13 V* V1223 Sgr CV* 18 55 02.3108012664 -31 09 49.584656268           ~ 319 0
14 V* V2306 Cyg XB* 19 58 14.4693586728 +32 32 42.003103200 15.16 15.94 15.71 15.76   ~ 57 0
15 V* AE Aqr CV* 20 40 09.1598959176 -00 52 15.055595220   12.46 10.40   10.191 K3-5IV/V 645 0
16 V* LS Peg CV* 21 51 57.9373184400 +14 06 53.271115344   11.886 11.800 12.115   ~ 83 0
17 V* FO Aqr CV* 22 17 55.3796835600 -08 21 03.754995948           ~ 342 0
18 V* AO Psc CV* 22 55 17.9860863984 -03 10 39.981831564           ~ 299 0

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2022.08.09-03:25:44

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