2008A&A...492..787S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST23:08:59

2008A&A...492..787S - Astronomy and Astrophysics, volume 492, 787-803 (2008/12-4)

The secrets of T Pyxidis. II. A recurrent nova that will not become a SN Ia.

SELVELLI P., CASSATELLA A., GILMOZZI R. and GONZALEZ-RIESTRA R.

Abstract (from CDS):

We compare the observed and theoretical parameters for the quiescent and outburst phases of the recurring nova T Pyx. IUE data were used to derive the disk luminosity and the mass accretion rate, and to exclude the presence of quasi-steady burning at the WD surface. XMM-NEWTON data were used to verify this conclusion. By various methods, we obtained Ldisk ∼70L and {dot}(M)∼1.1x10–8M/yr. These values were about twice as high in the pre-1966-outburst epoch. This allowed the first direct estimate of the total mass accreted before outburst, Maccr={dot}(M)pre–OB .Δt, and its comparison with the critical ignition mass Mign. We found Maccr and Mign to be in perfect agreement (with a value close to 5x10–7M) for M1∼1.37M, which provides a confirmation of the thermonuclear runaway theory. The comparison of the observed parameters of the eruption phase, with the corresponding values in the grid of models by Yaron and collaborators, provides satisfactory agreement for values of M1 close to 1.35 M and log{dot}(M) between -8.0 and -7.0, but the observed value of the decay time t3 is higher than expected. The long duration of the optically thick phase during the recorded outbursts of T Pyx, a spectroscopic behavior typical of classical novae, and the persistence of P Cyg profiles, constrains the ejected mass Mign to within 10–5-10–4M. Therefore, T Pyx ejects far more material than it has accreted, and the mass of the white dwarf will not increase to the Chandrasekhar limit as generally believed in recurrent novae. A detailed study based on the UV data excludes the possibility that T Pyx belongs to the class of the supersoft X-ray sources, as has been postulated. XMM-NEWTON observations have revealed a weak, hard source and confirmed this interpretation.

Abstract Copyright:

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

Simbad objects: 21

goto Full paper

goto View the reference in ADS

Number of rows : 21

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     ~ 10905 1
2 NOVA SMC 2001 No* 00 46 27.92 -73 29 45.5           ~ 13 0
3 V* GK Per No* 03 31 12.0096626899 +43 54 15.467450081   10.2 14.0     K1IV 866 0
4 NOVA LMC 1990 a No* 05 23 21.79 -69 29 48.4           ~ 60 0
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14832 1
6 V* TV Col No* 05 29 25.5292527066 -32 49 03.900974253     13.60     K1 306 0
7 NOVA LMC 2002 No* 05 36 46.38 -71 35 34.4           ~ 12 0
8 V* RR Pic No* 06 35 36.0633947411 -62 38 24.292758747   12.30 12.502   12.385 ~ 316 0
9 NOVA Pyx 1890 No* 09 04 41.5062068236 -32 22 47.503345173   7.0       ~ 379 1
10 NOVA Nor 1920 No* 15 39 26.465 -52 19 17.99           ~ 76 0
11 EGGR 116 WD* 16 08 22.1888382580 +42 05 43.437369514   13.91   13.7   DA3.8 37 0
12 NOVA Sco 1863 No* 16 22 30.7782086963 -17 52 43.162570042   8.80 8.70     F8+K2 464 0
13 V* V841 Oph No* 16 59 30.3745002409 -12 53 27.137639551   5.0       ~ 124 0
14 V* V533 Her No* 18 14 20.4845602013 +41 51 22.070248280           ~ 232 0
15 NOVA Sgr 1998 No* 18 21 40.49 -27 31 37.3           ~ 77 0
16 V* V603 Aql No* 18 48 54.6369118792 +00 35 02.855110952 10.73 11.65 11.64     OB+e: 511 0
17 NOVA Aql 1917 No* 18 52 03.5647265171 -01 28 39.191180908           ~ 146 0
18 V* V Sge NL* 20 20 14.6910210608 +21 06 10.437296116   11.27 11.22 11.54   Be 201 0
19 NOVA Vul 1984 b No* 20 26 45.94 +27 50 42.2           ~ 238 0
20 V* HR Del No* 20 42 20.3467536529 +19 09 39.304605595   12.46 3.70 12.69   ~ 461 0
21 NOVA Cyg 1978 No* 21 42 35.22 +44 01 54.9   20.0       ~ 215 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2008A&A...492..787S and select 'bookmark this link' or equivalent in the popup menu


2020.07.13-23:08:59

© Université de Strasbourg/CNRS

    • Contact