# 2011A&A...530A..70D

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 Query : 2011A&A...530A..70D

2011A&A...530A..70D - Astronomy and Astrophysics, volume 530A, 70-70 (2011/6-1)

On the progenitor system of nova V2491 Cygni.

DARNLEY M.J., RIBEIRO V.A.R.M., BODE M.F. and MUNARI U.

Abstract (from CDS):

Nova V2491 Cyg is one of just two detected pre-outburst in X-rays. The light curve of this nova exhibited a rare re-brightening'' which has been attributed by some as the system being a polar, whilst others claim that a magnetic WD is unlikely. By virtue of the nature of X-ray and spectroscopic observations the system has been proposed as a recurrent nova, however the adoption of a 0.1 day orbital period is generally seen as incompatible with such a system. In this research note we address the nature of the progenitor system and the source of the 0.1 day periodicity. Through the combination of Liverpool Telescope observations with published data and archival 2MASS data we show that V2491 Cyg, at a distance of 10.5-14kpc, is likely to be a recurrent nova of the U Sco-class; containing a sub-giant secondary and an accretion disk, rather than accretion directly onto the poles. We show that there is little evidence, at quiescence, supporting a ∼0.1 day periodicity, the variation seen at this stage is likely caused by flickering of a re-established accretion disk. We propose that the periodicity seen shortly after outburst is more likely related to the outburst rather than the - then obscured - binary system. Finally we address the distance to the system, and show that a significantly lower distance (∼2kpc) would result in a severely under-luminous outburst, and as such favour the larger distance and the recurrent nova scenario.

Journal keyword(s): novae, cataclysmic variables - stars: individual: V2491 Cyg

CDS comments: Paragraph 1 USNO-B1.0 1223-042965 is a misprint for USNO-B1.0 1223-0482965

Full paper

 Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12172 1
2 2XMMi J004319.9+411346 No* 00 43 20.00 +41 13 46.0       17.0   ~ 29 0
3 V* U Sco CV* 16 22 30.7791646104 -17 52 43.166822628           F8+K2 524 0
4 V* V2487 Oph No* 17 31 59.805 -19 13 56.13   18.0       ~ 112 0
5 V* V2672 Oph No* 17 38 19.72 -26 44 13.7           ~ 47 0
6 V* RS Oph Sy* 17 50 13.1591484960 -06 42 28.480729788   11.884 10.776 11.228   K5.5/M0IIIe 1040 0
7 V* V394 CrA No* 18 00 26.0346757464 -39 00 34.388605836           ~ 127 0
8 V* DQ Her CV* 18 07 30.2510391864 +45 51 32.564791872   14.605 14.443 14.800   M3+Ve 996 1
9 V* V477 Sct No* 18 38 42.93 -12 16 15.6           ~ 24 0
10 V* V1493 Aql No* 19 07 37.1007611347 +12 31 27.924062554           ~ 70 0
11 V* V2491 Cyg CV* 19 43 01.9771342416 +32 19 13.549047276 18.27 18.72 18.03 17.72 17.41 ~ 156 0
12 V* V2362 Cyg CV* 21 11 32.3419758636 +44 48 03.668158208           ~ 101 0

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2023.03.29-11:26:25