2011A&A...526A..73I


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST02:08:43

2011A&A...526A..73I - Astronomy and Astrophysics, volume 526A, 73-73 (2011/2-1)

Spectral evolution of the nova V2468 Cygni: asymmetric and variable profiles of its emission lines.

IIJIMA T. and NAITO H.

Abstract (from CDS):

The spectral evolution of the classical nova V2468 Cygni (Nova Cyg 2008) was monitored at Asiago Astrophysical Observatory in Italy and at Nishi-Harima Astronomical Observatory in Hyogo Japan from soon after the discovery in March 2008 to the end of 2009. The notable peculiarities in the spectra of this nova were the asymmetric and variable profiles of its emission lines. The emission-line profiles of HI varied in the early decline stage in 2008, while their profiles were nearly stable in 2009. On the other hand, large variations in the profiles of the emission lines of [OIII], [FeVII], and HeII were observed in 2009. In the spectrum obtained on 2009 October 15, the red parts of the emission lines of [OIII] strengthened with respect to the profiles in September, while the red parts of the lines of HeII and [FeVII] faded. The emission lines of [FeVII] 5721 and [FeVII]+[CaV] 6087 exhibited convex profiles on 2009 September 27 and 28 in a similar way to the other lines, while only these lines had concave profiles on October 26 and 29. It seems to be difficult to explain the variations in the emission-line profiles with any known model of nova shells. The absolute magnitude at light maximum and the distance to the nova are estimated to be MV=-8.8±0.3mag and d=5.5±0.8kpc. Using the intensities of HI, HeI, and HeII lines observed in September 2009, we estimated the helium abundance in number to be N(He)=0.20±0.01, and the mass of the ejecta to be 1.7±1x10–5M. A very broad emission line from 3790Å to 3850Å was detected in the spectrum obtained on 2009 July 21. We propose that the multiple lines of [FeV] 3F, 3839.3, 3794.9, 3851.3, 3819.9 etc. suddenly strengthened at that time, but the cause of this phenomenon is not known.

Abstract Copyright:

Journal keyword(s): stars: individual: V2468 Cygni - novae, cataclysmic variables

Simbad objects: 9

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Number of rows : 9

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* RS Oph No* 17 50 13.1592776879 -06 42 28.481553668   12.29 4.30     OB+M2ep 922 0
2 V* V1494 Aql No* 19 23 05.30 +04 57 19.1           ~ 147 0
3 V* BF Cyg Sy* 19 23 53.5009795759 +29 40 29.173306238   10.52 9.30     Bep+M5III 265 0
4 V* HM Sge Sy* 19 41 57.0758884476 +16 44 39.856454738   12.38 11.10     M7 434 1
5 EM* AS 373 Sy* 19 57 05.0184580246 +39 49 36.085051314         10.592 M6/8e 566 0
6 NOVA Cyg 2008 No* 19 58 33.57 +29 52 11.6           ~ 39 0
7 V* V2011 Cyg SB* 20 12 33.1205906584 +40 16 05.442931142 7.32 7.85 7.55     O4.5V(n)((f)) 195 0
8 V* PU Vul No* 20 21 13.3112218215 +21 34 18.693825946   11.13 10.87     A4II-F8Iab+M6IIIe 293 0
9 V* V1329 Cyg Sy* 20 51 01.2322054447 +35 34 54.111427235           M4IIIe 294 2

    Equat.    Gal    SGal    Ecl

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2020.07.08-02:08:43

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