2014A&A...570A..37P


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST03:30:18

2014A&A...570A..37P - Astronomy and Astrophysics, volume 570A, 37-37 (2014/10-1)

X-ray and UV observations of V751 Cygni in an optical high state.

PAGE K.L., OSBORNE J.P., BEARDMORE A.P., EVANS P.A., ROSEN S.R. and WATSON M.G.

Abstract (from CDS):

The VY Scl system (anti-dwarf nova) V751 Cyg is examined following a claim of a super-soft spectrum in the optical low state. A serendipitous XMM-Newton X-ray observation and, 21 months later, Swift X-ray and UV observations, have provided the best such data on this source so far. These optical high-state datasets are used to study the flux and spectral variability of V751 Cyg. Both the XMM-Newton and Swift data show evidence for modulation of the X-rays for the first time at the known 3.467h orbital period of V751 Cyg. In two Swift observations, taken ten days apart, the mean X-ray flux remained unchanged, while the UV source brightened by half a magnitude. The X-ray spectrum was not super-soft during the optical high state, but rather due to multi-temperature optically thin emission, with significant (1021–22cm–2) absorption, which was higher in the observation by Swift than that of XMM-Newton. The X-ray flux is harder at orbital minimum, suggesting that the modulation is related to absorption, perhaps linked to the azimuthally asymmetric wind absorption seen previously in Hα.

Abstract Copyright:

Journal keyword(s): binaries: general - novae, cataclysmic variables - X-rays: stars - ultraviolet: stars - stars: individual: V751 Cyg

Simbad objects: 16

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Number of rows : 16

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* TT Ari No* 02 06 53.0797667881 +15 17 41.849759579   10.73 10.20     Bep: 418 0
2 V* HV Cet No* 03 05 59.0 +05 47 15           ~ 33 0
3 SV* HV 5682 XB* 05 13 50.809 -69 51 47.30     16.566 16.606 16.62 ~ 305 0
4 2E 1550 XB* 05 43 34.1600994175 -68 22 22.189299745   15.9   17.2 16.54 ~ 306 0
5 V* KR Aur No* 06 15 43.9180386147 +28 35 08.574183087           ~ 146 0
6 EGB 4 NL* 06 29 33.9598585876 +71 04 36.392469723   13.29 13.27 13.04   ~ 131 0
7 NOVA Mon 2012 No* 06 39 38.74 +05 53 52.0           ~ 119 0
8 V* DW UMa CV* 10 33 52.8751166936 +58 46 54.719916520   14.33   14.33 14.35 ~ 214 0
9 V* MV Lyr No* 19 07 16.2886975947 +44 01 07.867270712   12.18 12.843   12.578 M5Ve 249 0
10 V* V794 Aql No* 20 17 33.9157230491 -03 39 50.961851201           ~ 82 0
11 * 56 Cyg PM* 20 50 04.9312938076 +44 03 33.486215185       4.9   A6V 76 0
12 EM* LkHA 170 Ae* 20 52 12.7784292502 +44 19 26.087626178           A0e 103 0
13 * 57 Cyg Al* 20 53 14.7550278 +44 23 14.140852 4.05 4.63 4.77 4.84 4.97 B5V 181 0
14 HD 199178 Ro* 20 53 53.6522297846 +44 23 11.078229740   7.98 7.24     G5III-IV 199 1
15 NGC 7000 HII 20 58 47 +44 19.8           ~ 361 1
16 GD 1662 NL* 23 29 00.4711137193 -29 46 45.980626470           OBe 142 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-03:30:18

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