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


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.17CET07:09:08

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.

Abstract Copyright:

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

Simbad objects: 12

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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 - 2020
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10581 1
2 2XMMi J004319.9+411346 No* 00 43 20.00 +41 13 46.0       17.0   ~ 28 0
3 NOVA Sco 1863 No* 16 22 30.7782086963 -17 52 43.162570042   8.80 8.70     F8+K2 458 0
4 V* V2487 Oph No* 17 31 59.805 -19 13 56.13   18.0       ~ 100 0
5 NOVA Oph 2009 No* 17 38 19.72 -26 44 13.7           ~ 40 0
6 V* RS Oph No* 17 50 13.1592776879 -06 42 28.481553668   12.29 4.30     OB+M2ep 909 0
7 NOVA CrA 1987 No* 18 00 25.97 -39 00 35.1           ~ 122 0
8 V* DQ Her No* 18 07 30.2510755201 +45 51 32.564649735   12.99 15.16 11.46   M3+Ve 953 1
9 NOVA Sct 2005 b No* 18 38 42.93 -12 16 15.6     10.4     ~ 24 0
10 NOVA Aql 1999 No* 19 07 36.90 +12 31 26.2           ~ 65 0
11 NOVA Cyg 2008 b No* 19 43 01.9773145314 +32 19 13.545320806 18.27 18.72 18.03 17.72 17.41 ~ 134 0
12 NOVA Cyg 2006 No* 21 11 32.346 +44 48 03.66   10.5 8.5     ~ 90 1

    Equat.    Gal    SGal    Ecl

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2019.11.17-07:09:08

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