2009MNRAS.394.1551N

Query : 2009MNRAS.394.1551N

2009MNRAS.394.1551N - Mon. Not. R. Astron. Soc., 394, 1551-1558 (2009/April-2)

Near-infrared observations of the novae V2491 Cygni and V597 Puppis.

NAIK S., BANERJEE D.P.K. and ASHOK N.M.

Abstract (from CDS):

We present results obtained from near-infrared JHK spectroscopic observations of novae V2491 Cygni and V597 Puppis in the early declining phases of their 2007 and 2008 outbursts, respectively. In both objects, the spectra displayed emission lines of Hi, Oi, He i and Ni. In V597 Pup, the Hei lines were found to strengthen rapidly with time. Based on the observed spectral characteristics, both objects are classified as He/N novae. We have investigated the possibility of V2491 Cyg being a recurrent nova as has been suggested. By studying the temporal evolution of the linewidths in V2491 Cyg, it appears unlikely that the binary companion is a giant star with heavy wind as in recurrent novae of the RS Oph type. Significant deviations from that of recombination case B conditions are observed in the strengths of the Hi lines. This indicates that the Hi lines, in both novae, are optically thick during the span of our observations. The slope of the continuum spectra in both cases was found to have a λ–(3–3.5) dependence which deviates from a Rayleigh-Jeans spectral distribution. Both novae were detected in the post-outburst supersoft X-ray phase; V2491 Cyg being very bright in X-rays has been the target of several observations. We discuss and correlate our infrared observations with the observed X-ray properties of these novae.

Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS

Journal keyword(s): techniques: spectroscopic - stars: individual (V597 Pup, V2491 Cyg) - novae, cataclysmic variables - infrared: stars

Simbad objects: 26

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Number of rows : 26
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 LMCN 1995-02a No* 05 26 49.9444560367 -70 01 24.520835218           ~ 42 0
2 * f Pup ** 07 37 22.10978 -34 58 06.7109 4.13 4.44 4.53 4.55 4.62 B8IV/V 63 0
3 V* V574 Pup No* 07 41 53.5879413696 -27 06 37.894596372   18.2 17.9     ~ 53 0
4 * l Pup sg* 07 43 48.4696146486 -28 57 17.374357218 4.06 4.09 3.93 3.68 3.50 A4Iabe 191 0
5 V* V597 Pup No* 08 16 17.9596509204 -34 15 24.933440401   21.65       ~ 51 0
6 V* V382 Vel No* 10 44 48.3975221712 -52 25 31.168268472   15.945 15.737 16.173   ~ 192 0
7 V* GQ Mus No* 11 52 02.4296561952 -67 12 20.986391520           ~ 264 0
8 V* U Sco CV* 16 22 30.7791646104 -17 52 43.166822628           F8+K2 549 0
9 V* V1280 Sco No* 16 57 40.91 -32 20 36.4           ~ 100 0
10 V* V2487 Oph No* 17 31 59.805 -19 13 56.13   18.0       ~ 120 0
11 V* RS Oph Sy* 17 50 13.1591484960 -06 42 28.480729788   11.884 10.776 11.228   K5.5/M0IIIe 1090 0
12 V* V4643 Sgr No* 17 54 40.4172408408 -26 14 15.498092040   17.4       ~ 44 0
13 V* V394 CrA No* 18 00 26.0346757464 -39 00 34.388605836           ~ 133 0
14 V* V4633 Sgr No* 18 21 40.48680 -27 31 37.2972           ~ 84 0
15 * gam Lyr * 18 58 56.6225626515 +32 41 22.400666366 3.140 3.200 3.250 3.27 3.28 B9III 284 0
16 V* V4743 Sgr No* 19 01 09.3393890856 -22 00 06.016418064           ~ 146 0
17 V* V1493 Aql No* 19 07 37.1007611347 +12 31 27.924062554           ~ 72 0
18 V* V1419 Aql No* 19 13 06.7917062592 +01 34 23.356169184           ~ 79 0
19 V* V1494 Aql No* 19 23 05.3600241442 +04 57 19.811779912           ~ 160 0
20 V* V2491 Cyg CV* 19 43 01.9771342416 +32 19 13.549047276 18.27 18.72 18.03 17.72 17.41 ~ 164 0
21 HD 186440 * 19 43 09.5978449296 +30 40 40.406561436   6.071 6.075     A1V 49 0
22 * 15 Vul a2* 20 01 06.0485823565 +27 45 12.862874097   4.829 4.651     A4III 237 0
23 V* V2274 Cyg No* 20 07 17.7740102078 +36 04 32.829959153           ~ 59 0
24 V* V1974 Cyg No* 20 30 31.6546001712 +52 37 50.837478240           ~ 579 0
25 V* V2362 Cyg CV* 21 11 32.3419758636 +44 48 03.668158208           ~ 104 0
26 V* V1500 Cyg No* 21 11 36.5809818696 +48 09 01.952490204           ~ 794 0

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