2009A&A...499..773N


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.16CET01:31:14

2009A&A...499..773N - Astronomy and Astrophysics, volume 499, 773-781 (2009/6-1)

A new grid of NLTE accretion-disc models for AMCVn systems: application to CE315.

NAGEL T., RAUCH T. and WERNER K.

Abstract (from CDS):

AMCVn stars are very compact interacting binary systems with helium-dominated spectra. The nature of the donor star remains unclear, but the accretion disc represents the chemical composition of the donor's atmosphere. Analysing the disc will therefore help us to understand the donor star and the formation of these systems. We investigate the influence of primary mass, mass-accretion rate, chemical abundances, irradiation by the primary, and inclination on the spectrum of the accretion disc to determine the extent to which it is possible to deduce these system properties by comparison with observed spectra. We compute a grid of metal-line blanketed NLTE accretion-disc spectra for an extensive parameter space by solving self-consistently the radiative-transfer equations and the equations describing the vertical structure using our accretion disc code AcDc. We detect emission-line spectra for low and absorption-line spectra for high mass-accretion rates. Irradiation of the accretion disc by the primary has almost no influence on the spectrum. The spectroscopic detection of the primary is achievable most easily in the UV. Comparing an observed spectrum of CE315 with our accretion-disc models, we find the qualitatively closest match for a 0.8M primary and a mass-accretion rate of 10–11M/yr. Furthermore, the disc of CE315 exhibits a strong silicon underabundance confirming the hypothesis that it is a Pop.II object.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - navae, cataclysmic variables - stars: individual: CE315

CDS comments: Table 1 SDSS J0926+3642 is a misprint for SDSS J0926+3624 (SDSS J092638.71+362402.4 in Simbad).

Simbad objects: 21

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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 V* V744 And CV* 01 29 40.0646985004 +38 42 10.442374016           DB 21 0
2 V* ES Cet AM* 02 00 52.2360462965 -09 24 31.645113651   16.3   16.7 16.97 ~ 66 0
3 V* CP Eri DN* 03 10 32.76 -09 45 05.3           DB+ 89 0
4 RX J0806.3+1527 XB* 08 06 22.9519582696 +15 27 31.007381265   20.7     21.2 ~ 119 0
5 V* V406 Hya NL* 09 05 54.7498123851 -05 36 08.482127031   19.8 16.5 19.1   ~ 49 1
6 V* YZ LMi CV* 09 26 38.7243250350 +36 24 02.463164875           DB 46 0
7 SDSS J120841.96+355025.1 CV* 12 08 42.0093838260 +35 50 25.391311004           ~ 17 0
8 V* AM CVn CV* 12 34 54.6230046722 +37 37 44.120772480   14.02 14.13 14.47   DBnnp 374 0
9 2QZ J124058.0-015920 CV* 12 40 58.0261678020 -01 59 19.186253289   19.2   19.6   DBe 46 0
10 V* GP Com NL* 13 05 42.4008232413 +18 01 03.765282516   15.59   15.9   DBe 236 0
11 V* V396 Hya No* 13 12 46.4403299058 -23 21 32.601548727   18.9   17.5   DD 81 0
12 V* V803 Cen RC* 13 23 44.5334901172 -41 44 29.260966080   16.8       ~ 137 1
13 V* CR Boo DN* 13 48 55.1859261603 +07 57 35.927051968           ~ 164 0
14 SDSS J141118.31+481257.6 CV* 14 11 18.3211338976 +48 12 57.515403663   18.7 19.37 19.2   DB 21 0
15 V* V558 Vir AM* 14 27 01.5904311460 -01 23 10.224938451   20.5 20.07 19.7   ~ 18 1
16 V* HP Lib CV* 15 35 53.0716707077 -14 13 12.217891145   13.55       Bpec 85 0
17 SDSS J155252.48+320150.9 CV* 15 52 52.4801964755 +32 01 51.018437025           DB 18 0
18 RX J1914.4+2456 XB* 19 14 26.09 +24 56 44.6           ~ 121 0
19 V* KL Dra DN* 19 24 38.28 +59 41 46.7   16.8       DB+ 52 1
20 V* PU Aqr DN* 20 47 39.41 +00 08 40.2           ~ 8 0
21 SNF 20060524-042 SN* ~ ~           ~ 1 0

    Equat.    Gal    SGal    Ecl

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2019.11.16-01:31:14

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