2025ApJ...982...41I


Query : 2025ApJ...982...41I

2025ApJ...982...41I - Astrophys. J., 982, 41 (2025/March-3)

An X-Ray View of the Cataclysmic Variable V902 Mon: Discovery of an X-Ray Eclipse.

ISLAM N. and MUKAI K.

Abstract (from CDS):

V902 Mon is one of a few eclipsing intermediate polars (IPs) and shows deep eclipses in the optical lightcurves. The presence of a strong Fe Kα fluorescence line in its X-ray spectrum and its low X-ray flux compared to other IPs suggests significant absorption, most likely from an accretion disk. In an observation carried out using the Nuclear Spectroscopic Telescope Array (NuSTAR), we confirm the presence of an X-ray eclipse in the energy-resolved lightcurves, coincident with the optical AAVSO/CV-band lightcurves. Broadband X-ray spectral analysis using NuSTAR and XMM-Newton observations confirm a strong absorption NH ∼ 1023 cm–2 local to the source, along with a high equivalent width of about 0.7 keV for an Fe Kα fluorescence line. We interpret this using a model similar to an accretion disk corona source, which has a very high inclination, and the compact object is heavily obscured by the body of the accretion disk. We propose that the primary X-rays from the accretion column in V902 Mon are hidden from our direct view at all times by the accretion disk. In this scenario, the observed scattered X-rays indicate substantial absorption of direct X-rays by the accretion disk. Additionally, a strong Fe fluorescence line suggests reprocessing of the radiation by a more extended region, such as the pre-shock region, which could be located a few white dwarf radii above the orbital plane.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Cataclysmic variable stars - Eclipsing binary stars - Astronomy data analysis

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026
#notes
1 V* XY Ari CV* 02 56 08.19048 +19 26 34.1844           ~ 167 1
2 MBM 12 MoC 02 56 50 +19 32.0           ~ 230 1
3 V* TV Col CV* 05 29 25.5292422792 -32 49 03.900212364   14.219 13.846 14.181   K2V 362 0
4 V* V902 Mon CV* 06 27 46.4047189728 +01 48 11.027200176           ~ 23 0
5 V* BG CMi CV* 07 31 29.0079060264 +09 56 23.030740248   14.5       ~ 246 0
6 V* V597 Pup No* 08 16 17.9596509204 -34 15 24.933440401   21.65       ~ 56 0
7 V* EX Hya CV* 12 52 24.2222471899 -29 14 55.999766523   13.505 13.491 13.549   M5-6V 730 0
8 V* BV Cen CV* 13 31 19.5105743208 -54 58 33.657394152     13.151 12.746 12.226 G5-8IV/V 196 0
9 V* NY Lup XB* 15 48 14.5961462732 -45 28 39.918849218       14.544   K0/3Ve 109 0
10 IGR J17014-4306 CV* 17 01 28.1539648512 -43 06 12.307434264           ~ 35 0
11 V* DQ Her CV* 18 07 30.2510391864 +45 51 32.564791872   14.605 14.443 14.800   M3+Ve 1048 1
12 V* V1223 Sgr CV* 18 55 02.3108012664 -31 09 49.584656268           ~ 347 0
13 V* CH Cyg Sy* 19 24 33.0657463320 +50 14 29.095038672 8.14 8.77 7.08   5.345 M7IIIab+Be 798 0
14 V* FO Aqr CV* 22 17 55.3796835600 -08 21 03.754995948   13.533 13.445 13.414   ~ 378 0

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