2014A&A...562A.132G


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.23CEST11:19:48

2014A&A...562A.132G - Astronomy and Astrophysics, volume 562A, 132-132 (2014/2-1)

Non-LTE spectral analysis of the AM CVn system PTF 09hpk during quiescence.

GEHRON K., NAGEL T., RAUCH T. and WERNER K.

Abstract (from CDS):

AM Canum Venaticorum stars are close, interacting binary systems with a white dwarf primary surrounded by a helium-dominated accretion disk. Because of the short orbital periods, the unseen secondary must be compact, too. Different evolutionary scenarios for the formation of these systems resulting in different kinds of secondaries are possible. Quantitative spectral analyses of accretion-disk spectra can reveal the nature of the secondary. We investigate a particular AM CVn system, discovered recently by the Palomar Transient Factory, PTF 09hpk. It is the only known AM CVn star exhibiting unambiguously both outbursts and superoutbursts. We characterize the accretion disk in quiescence and determine abundances of trace elements. We calculated line-blanketed nonlocal thermodynamic equilibrium (non-LTE) models and computed accretion-disk spectra by self-consistent solution of radiative transfer and vertical structure equations. These are compared to optical spectra taken during quiescence. In quiescence, the disk has a uniform effective temperature of 6000K. An optically thin boundary layer causes the observed HeII λ 4686Å emission feature. The disk around the massive white dwarf primary (1.2M) is dominated by helium and is strongly hydrogen-deficient (←5dex relative to the solar value). For heavy elements (C, N, O, Mg, Si, Fe), we find moderate to strong subsolar abundances, with depletions down to -2.5dex for iron. The N/O ratio is >10. According to the high N/O ratio, the secondary of PTF 09hpk is either a helium white dwarf or a helium star. The low metallicity points to a halo origin of the system or it might be the consequence of heavy-metal sedimentation if the secondary is an old, low-mass helium white dwarf.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - stars: dwarf novae - novae, cataclysmic variables - stars: individual: PTF1 J0719+4858

Simbad objects: 47

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Number of rows : 47

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* V744 And CV* 01 29 40.0646985004 +38 42 10.442374016           DB 23 0
2 V* ES Cet CV* 02 00 52.2360462965 -09 24 31.645113651   16.3   16.7 16.97 ~ 71 0
3 PHL 1475 CV* 03 10 32.7658212837 -09 45 06.154763507           DB+ 89 0
4 CRTS J043517.8+002941 CV* 04 35 17.73 +00 29 40.7           ~ 9 0
5 CRTS CSS121123 J045020-093113 CV* 04 50 20.0 -09 31 13           ~ 10 0
6 PTF1 J071912.13+485834.0 CV* 07 19 12.13 +48 58 34.0           ~ 14 0
7 V* U Gem CV* 07 55 05.2323858391 +22 00 05.045435077   15.3 14.54     DA 1054 0
8 SDSS J080449.49+161624.8 CV* 08 04 49.4909252414 +16 16 24.870111789           ~ 20 0
9 RX J0806.3+1527 XB* 08 06 22.9519582696 +15 27 31.007381265   20.7 20   21.2 ~ 127 0
10 V* SU UMa CV* 08 12 28.2694633475 +62 36 22.428029272           B2 476 0
11 PTF1 J085724.27+072946.7 CV* 08 57 24.27 +07 29 46.7           ~ 5 0
12 SDSS J090221.34+381941.9 CV* 09 02 21.3623207759 +38 19 41.841986014           ~ 18 0
13 V* V406 Hya CV* 09 05 54.7498123851 -05 36 08.482127031   19.8 16.5 19.1   ~ 50 0
14 V* YZ LMi CV* 09 26 38.7243250350 +36 24 02.463164875           DB 48 0
15 PTF1 J094329.59+102957.6 CV* 09 43 29.59872 +10 29 57.3828           ~ 9 0
16 CRTS CSS090331 J102843-081927 CV* 10 28 43.0 -08 19 27           ~ 11 0
17 GUVV J104325.0+563258.0 CV* 10 43 25.0788130702 +56 32 57.972256967   20.28   20.40 20.58 ~ 6 0
18 CRTS CSS120422 J111127+571239 CV* 11 11 26.8434553393 +57 12 38.694926101   18.5       ~ 25 0
19 CRTS CSS100603 J112253-111037 CV* 11 22 53.3324049081 -11 10 37.497253632           ~ 16 0
20 SDSS J120841.96+355025.2 CV* 12 08 42.0093838260 +35 50 25.391311004           ~ 21 0
21 V* AM CVn CV* 12 34 54.6230046722 +37 37 44.120772480   14.02 14.13 14.47   DBnnp 382 0
22 2QZ J124058.0-015920 CV* 12 40 58.0261678020 -01 59 19.186253289   19.2   19.6   DBe 47 0
23 V* V485 Cen CV* 12 57 23.1807451670 -33 12 05.745406224   15.8   15.9   ~ 98 0
24 G 61-29 CV* 13 05 42.4008232413 +18 01 03.765282516   15.59   15.9   DBe 244 0
25 V* V396 Hya No* 13 12 46.4403299058 -23 21 32.601548727   18.9   17.5   DD 86 0
26 V* V803 Cen CV* 13 23 44.5334901172 -41 44 29.260966080   16.8 14.42     ~ 139 0
27 V* CR Boo CV* 13 48 55.1859261603 +07 57 35.927051968     15.00     ~ 167 0
28 SDSS J141118.31+481257.6 CV* 14 11 18.3211338976 +48 12 57.515403663   18.7 19.37 19.2   DB 26 0
29 4FGL J1425.4-0119 BLL 14 25 26.1802136566 -01 18 25.788023086   19.73 19.23 19.8   ~ 16 0
30 V* OV Boo CV* 15 07 22.3705926422 +52 30 39.807033923   18.7   18.5   DAe 57 0
31 PTF1 J152310.71+184558.2 CV* 15 23 10.71 +18 45 58.2           ~ 4 0
32 SDSS J152509.57+360054.5 CV* 15 25 09.5669290812 +36 00 54.683831981           ~ 11 0
33 V* HP Lib CV* 15 35 53.0716707077 -14 13 12.217891145   13.55       Bpec 91 0
34 SDSS J155252.48+320150.9 CV* 15 52 52.4801964755 +32 01 51.018437025           DB 19 0
35 CRTS CSS110507 J163239+351108 CV* 16 32 39.39 +35 11 07.3           ~ 6 0
36 SDSS J164228.06+193410.0 CV* 16 42 28.0669862520 +19 34 10.124884085           ~ 10 0
37 CRTS J172102.5+273301 CV* 17 21 02.4797161648 +27 33 01.236649788           D 17 0
38 CRTS CSS140402 J173048+554518 CV* 17 30 47.5876728773 +55 45 18.463804625   20.20   20.08   ~ 10 0
39 KIC 4547333 CV* 19 08 17.0794939192 +39 40 36.449794366   15.18 15.43 17.11 15.24 ~ 27 0
40 RX J1914.4+2456 XB* 19 14 26.09 +24 56 44.6           ~ 126 0
41 PTF1 J191905.19+481506.2 CV* 19 19 05.1825844399 +48 15 06.031975863           ~ 15 0
42 V* KL Dra CV* 19 24 38.2451670877 +59 41 46.722317032   16.8       DB+ 52 1
43 BOKS 45906 CV* 19 40 16.1563118597 +46 32 47.773531170           ~ 8 0
44 2SLAQ J204720.76+000007.7 CV* 20 47 20.7665616344 +00 00 07.718158990           ~ 7 0
45 PTF1 J221910.09+313523.1 CV* 22 19 10.09 +31 35 23.1           ~ 5 0
46 V* EI Psc CV* 23 29 54.2149131154 +06 28 11.597690024   16.86 16.22     ~ 111 0
47 CRTS CSS111019 J233313-155744 CV* 23 33 13.0 -15 57 44           ~ 8 0

    Equat.    Gal    SGal    Ecl

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2021.04.23-11:19:48

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