C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST02:42:01

2014A&A...561A.121S - Astronomy and Astrophysics, volume 561A, 121-121 (2014/1-1)

XMM-Newton observations of the low-luminosity cataclysmic variable V405 Pegasi.


Abstract (from CDS):

V405 Peg is a low-luminosity cataclysmic variable (CV) that was identified as the optical counterpart of the bright, high-latitude ROSAT all-sky survey source RBS1955. The system was suspected to belong to a largely undiscovered population of hibernating CVs. Despite intensive optical follow-up its subclass however remained undetermined. We want to further classify V405 Peg and understand its role in the CV zoo via its long-term behaviour, spectral properties, energy distribution and accretion luminosity. We perform a spectral and timing analysis of XMM-Newton X-ray and ultra-violet data. Archival WISE, HST, and Swift observations are used to determine the spectral energy distribution and characterize the long-term variability. The X-ray spectrum is characterized by emission from a multi-temperature plasma. No evidence for a luminous soft X-ray component was found. Orbital phase-dependent X-ray photometric variability by ∼50% occurred without significant spectral changes. No further periodicity was significant in our X-ray data. The average X-ray luminosity during the XMM-Newton observations was L_X, bol_ ≃5x1030erg/s but, based on the Swift observations, the corresponding luminosity varied between 5x1029erg/s and 2x1031erg/s on timescales of years. The CV subclass of this object remains elusive. The spectral and timing properties show commonalities with both classes of magnetic and non-magnetic CVs. The accretion luminosity is far below than that expected for a standard accreting CV at the given orbital period. Objects like V405 Peg might represent the tip of an iceberg and thus may be important contributors to the Galactic Ridge X-ray Emission. If so they will be uncovered by future X-ray surveys, e.g. with eROSITA.

Abstract Copyright:

Journal keyword(s): stars: individual: V405 Pegasi - novae, cataclysmic variables - X-rays: binaries - accretion, accretion disks

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 V* BB Dor No* 05 29 28.5850788827 -58 54 46.184997516 13.68 15.57 15.52 14.83   ~ 38 0
2 V* EX Dra DN* 18 04 14.2486747659 +67 54 12.271788519   14.5 14.7     ~ 111 0
3 V* DT Oct DN* 18 40 52.4027422049 -83 43 09.999523837   11.2 11.4     ~ 30 0
4 2MASS J23094480+2135375 * 23 09 44.8122134564 +21 35 37.370203205           ~ 1 0
5 V* V405 Peg DN* 23 09 49.1426536138 +21 35 17.176816858   16.68 16.19 16.02   ?+M3/4.5e 31 1
6 GD 1662 NL* 23 29 00.4711137193 -29 46 45.980626470           OBe 142 0
7 NAME Galactic Ridge ? ~ ~           ~ 427 1

    Equat.    Gal    SGal    Ecl

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