2014ApJ...794...35G

Query : 2014ApJ...794...35G

2014ApJ...794...35G - Astrophys. J., 794, 35 (2014/October-2)

Precise atmospheric parameters for the shortest-period binary white dwarfs: gravitational waves, metals, and pulsations.

GIANNINAS A., DUFOUR P., KILIC M., BROWN W.R., BERGERON P. and HERMES J.J.

Abstract (from CDS):

We present a detailed spectroscopic analysis of 61 low-mass white dwarfs and provide precise atmospheric parameters, masses, and updated binary system parameters based on our new model atmosphere grids and the most recent evolutionary model calculations. For the first time, we measure systematic abundances of He, Ca, and Mg for metal-rich, extremely low mass white dwarfs and examine the distribution of these abundances as a function of effective temperature and mass. Based on our preliminary results, we discuss the possibility that shell flashes may be responsible for the presence of the observed He and metals. We compare stellar radii derived from our spectroscopic analysis to model-independent measurements and find good agreement except for white dwarfs with Teff ≲ 10,000 K. We also calculate the expected gravitational wave strain for each system and discuss their significance to the eLISA space-borne gravitational wave observatory. Finally, we provide an update on the instability strip of extremely low mass white dwarf pulsators.

Abstract Copyright: ∼

Journal keyword(s): binaries: close - stars: abundances - stars: fundamental parameters - techniques: spectroscopic - white dwarfs

VizieR on-line data: <Available at CDS (J/ApJ/794/35): table1.dat table2.dat>

Simbad objects: 70

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Number of rows : 70
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 GALEX J002207.6-101423 WD* 00 22 07.6572581736 -10 14 23.555210532           DA 24 0
2 GALEX J002228.3+003115 WD* 00 22 28.4509588368 +00 31 15.527797320           DA 19 0
3 GALEX J005648.1-061141 WD* 00 56 48.2217929184 -06 11 41.557821792   17.2   17.6   D 15 0
4 SDSS J010657.39-100003.3 HS* 01 06 57.4035165312 -10 00 03.303934740   19.5   19.5   sdB 29 1
5 GALEX J011210.2+183503 WD* 01 12 10.2534117096 +18 35 03.827993856   17.0   17.5   DA 22 0
6 GALEX J015213.7+074913 WD* 01 52 13.7776613904 +07 49 14.106768816           DA 14 0
7 PSR J0337+1715 Psr 03 37 43.8210968640 +17 15 14.886499572           ~ 113 0
8 LP 413-40 WD* 03 45 16.8306937296 +17 48 08.702047980   17.1   16.3   DA 77 0
9 GALEX J065133.3+284424 WD* 06 51 33.3404753832 +28 44 23.448959772           DAH 98 0
10 GALEX J073032.7+170356 WD* 07 30 32.9006719680 +17 03 57.087855540   20.0   20.1   DAH 9 0
11 GALEX J073842.6+183509 WD* 07 38 42.5662133112 +18 35 09.713206464           DBZ 67 0
12 GALEX J074511.5+194925 WD* 07 45 11.5697202720 +19 49 26.598323604   16.5   15.55   DA 17 0
13 GALEX J075141.1-014121 WD* 07 51 41.1768601008 -01 41 20.957784072   17.4   17.4   D 31 0
14 GALEX J075519.4+480033 WD* 07 55 19.4755767912 +48 00 34.060709988           DA 29 0
15 GALEX J075552.6+490628 WD* 07 55 52.4084306208 +49 06 27.943481232   20.8       DA 17 0
16 SDSS J080250.13-095549.8 WD* 08 02 50.1368106408 -09 55 49.832443848   19.1   19.4   D 10 0
17 GALEX J081133.4+022558 WD* 08 11 33.5581506048 +02 25 56.750675124           D 15 0
18 GALEX J081544.2+230906 HS* 08 15 44.2428837840 +23 09 05.055656148   18.7   18.6   sdB 19 1
19 GALEX J081822.4+353620 WD* 08 18 22.3396737192 +35 36 18.922231116   20.8   19.9   DA 17 0
20 SDSS J082212.57+275307.4 WD* 08 22 12.5767704408 +27 53 07.503424512           DA 31 0
21 GALEX J082511.9+115236 WD* 08 25 11.9032540704 +11 52 36.435746496           DA 19 0
22 GALEX J084037.6+152707 WD* 08 40 37.5714527184 +15 27 04.556730564   19.9   19.6   DA 10 0
23 GALEX J084523.0+162457 WD* 08 45 23.0331527640 +16 24 57.546435528           DA 11 0
24 SDSS J084910.13+044528.7 WD* 08 49 10.1295863640 +04 45 28.707340572   19.0   19.5   DA 30 0
25 GALEX J090052.0+023414 WD* 09 00 52.0439431896 +02 34 13.879420428   17.7   18.1   DA 9 0
26 SDSS J091709.55+463821.8 WD* 09 17 09.5538167784 +46 38 21.666153876           DA 39 0
27 CBS 6 WD* 09 23 45.6023056776 +30 28 05.083240368   16       DA2.7 55 0
28 GALEX J100548.1+054204 WD* 10 05 48.0941269128 +05 42 04.416234264           DA 11 0
29 SDSS J100554.05+355014.2 WD* 10 05 54.0533987568 +35 50 14.383547016           D 11 0
30 GALEX J100559.1+224932 WD* 10 05 59.1154061304 +22 49 32.311886664           DA+DA 59 0
31 PSR J1012+5307 Psr 10 12 33.4345449600 +53 07 02.548542576     19.5     DA 419 1
32 2QZ J104607.8-015359 WD* 10 46 07.8703094256 -01 53 58.454915640   18.0   18.5   DA 12 0
33 GALEX J105353.8+520031 WD* 10 53 53.9102986512 +52 00 31.033370736           DA 37 0
34 GALEX J105610.9+653631 WD* 10 56 11.0245152024 +65 36 31.526253072   20.0   19.6   DA 24 0
35 HS 1102+0934 WD* 11 04 36.7495773072 +09 18 22.842050364   16.9   16.5   DA 31 0
36 GALEX J111215.8+111745 WD* 11 12 15.8349560304 +11 17 45.120382836   16.54 16.31 16.2   DA 32 0
37 GALEX J114155.7+385004 WD* 11 41 55.5597679320 +38 50 03.088472928           D 21 0
38 GALEX J115138.4+585855 WD* 11 51 38.3886635472 +58 58 53.378412132   20.4       D 10 0
39 SDSS J115734.45+054645.4 WD* 11 57 34.4574153336 +05 46 45.560960292   19.9   19.9   D 14 0
40 GALEX J123316.2+160204 WD* 12 33 16.1976126360 +16 02 04.725298968   20.4   19.6   DA 19 0
41 GALEX J123410.3-022803 WD* 12 34 10.3676638032 -02 28 02.806799988   17.7   18.4   DA 41 0
42 GALEX J123800.0+194631 HB* 12 38 00.1052275056 +19 46 31.626561432           B 20 1
43 SDSS J125733.63+542850.5 WD* 12 57 33.6542910024 +54 28 50.449435680           DA 50 0
44 GALEX J142200.8+435253 WD* 14 22 00.7422058440 +43 52 53.029934508           DA 16 0
45 SBSS 1434+503 WD* 14 36 33.2892435360 +50 10 26.924868192   18.0       DA 41 0
46 GALEX J143948.4+100222 WD* 14 39 48.4027117656 +10 02 21.732994284   19.0   18.5   DA 15 0
47 GALEX J144342.7+150939 WD* 14 43 42.7569449112 +15 09 38.945662092   18.5   18.6   DA 18 0
48 GALEX J144801.1+134232 WD* 14 48 01.1219546280 +13 42 32.772038544           DA 13 0
49 GALEX J151225.6+261539 WD* 15 12 25.6998135816 +26 15 38.475138564   20.1   19.9   DA 15 0
50 GALEX J151826.7+065814 WD* 15 18 26.6907090120 +06 58 13.261800468           DA 32 0
51 GALEX J153844.2+025210 WD* 15 38 44.2208518056 +02 52 09.581478636   18.4   19.0   D 11 0
52 GALEX J155708.5+282336 WD* 15 57 08.4830623752 +28 23 36.057237324           DA 26 0
53 GALEX J161431.2+191219 WD* 16 14 31.2888356856 +19 12 19.463673528       16.30   DA 16 0
54 GALEX J162542.1+363218 WD* 16 25 42.1085895240 +36 32 19.082515344           DA 22 0
55 GALEX J163026.0+271226 WD* 16 30 26.0939235024 +27 12 26.553728484   20.5   19.8   DA 14 0
56 SDSS J163030.58+423305.7 WD* 16 30 30.5861975760 +42 33 05.778895032   19.2   19.3   DA 34 0
57 GD 518 WD* 16 59 15.3799290528 +66 10 32.657977416   16.5   17.4   DA4.2 46 0
58 GALEX J171708.5+675712 WD* 17 17 08.8568396016 +67 57 11.379229200   13.54 13.73 13.77   DAZ 32 0
59 GALEX J174140.5+652638 WD* 17 41 40.4935342416 +65 26 38.700436884   18.3   19.2   DA 25 0
60 PSR J1816+4510 Psr 18 16 35.9342957160 +45 10 33.917516328           ~ 126 0
61 GALEX J184038.0+642313 WD* 18 40 37.7911925616 +64 23 12.272542224   18.6   19.4   DA 34 0
62 2MASS J19365001+4201436 HS* 19 36 50.0156687112 +42 01 43.555361196           sdB+D 15 1
63 SDSS J210308.79-002748.9 WD* 21 03 08.7939332376 -00 27 48.887759196           DA 15 0
64 GALEX J211921.9-001824 WD* 21 19 21.9636760056 -00 18 25.833784356   20.0   20.2   DA 19 0
65 GALEX J213228.3+075428 WD* 21 32 28.3625599560 +07 54 28.271598012   18.1   17.0   D 14 0
66 SDSS J222859.93+362359.6 WD* 22 28 59.9311926768 +36 23 59.634736656   16.9   16.7   DA 17 0
67 LP 400-22 ** 22 36 30.0130703280 +22 32 23.662277484   17.5   17.1   DA+DA 45 1
68 GALEX J225242.2-005626 WD* 22 52 42.2588149296 -00 56 26.720974968           DA 21 0
69 GALEX J233821.4-205222 WD* 23 38 21.4958534472 -20 52 22.838599020   20.4   19.7   D 10 0
70 GALEX J234536.4-010204 WD* 23 45 36.4775895144 -01 02 04.938594504           DA 20 0

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