2007MNRAS.382.1377R

Query : 2007MNRAS.382.1377R

2007MNRAS.382.1377R - Mon. Not. R. Astron. Soc., 382, 1377-1393 (2007/December-3)

Post-common-envelope binaries from SDSS - I. 101 white dwarf main-sequence binaries with multiple Sloan Digital Sky Survey spectroscopy.

REBASSA-MANSERGAS A., GANSICKE B.T., RODRIGUEZ-GIL P., SCHREIBER M.R. and KOESTER D.

Abstract (from CDS):

We present a detailed analysis of 101 white dwarf main-sequence binaries (WDMS) from the Sloan Digital Sky Survey (SDSS) for which multiple SDSS spectra are available. We detect significant radial velocity variations in 18 WDMS, identifying them as post-common-envelope binaries (PCEBs) or strong PCEB candidates. Strict upper limits to the orbital periods are calculated, ranging from 0.43 to 7880d. Given the sparse temporal sampling and relatively low spectral resolution of the SDSS spectra, our results imply a PCEB fraction of ≳15 per cent among the WDMS in the SDSS data base. Using a spectral decomposition/fitting technique we determined the white dwarf effective temperatures and surface gravities, masses and secondary star spectral types for all WDMS in our sample. Two independent distance estimates are obtained from the flux-scaling factors between the WDMS spectra, and the white dwarf models and main-sequence star templates, respectively. Approximately one-third of the systems in our sample show a significant discrepancy between the two distance estimates. In the majority of discrepant cases, the distance estimate based on the secondary star is too large. A possible explanation for this behaviour is that the secondary star spectral types that we determined from the SDSS spectra are systematically too early by one to two spectral classes. This behaviour could be explained by stellar activity, if covering a significant fraction of the star by cool dark spots will raise the temperature of the interspot regions. Finally, we discuss the selection effects of the WDMS sample provided by the SDSS project.

Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS

Journal keyword(s): accretion, accretion discs - binaries: close - novae, cataclysmic variables

VizieR on-line data: <Available at CDS (J/MNRAS/382/1377): table2.dat table3.dat>

Nomenclature: Table 1, Figs 3-4: [RGR2007] JHHMM+DDMM N=18+84+61. Tables 2-3: [RGR2007] JHHMMSS.ss+DDMMSS.s N=123.

Simbad objects: 142

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Number of rows : 142
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 SDSS J000442.00-002011.5 ** 00 04 41.9995922808 -00 20 11.534402256           D+K: 3 0
2 GALEX J001029.7+003126 ** 00 10 29.8796797920 +00 31 26.251620276           DA+dM 8 0
3 GALEX J001247.2+001050 ** 00 12 47.1860599296 +00 10 48.822389868           DA+M 10 0
4 GALEX J001726.6-002449 ** 00 17 26.6348887072 -00 24 51.475678762           DA+dMe 16 0
5 PB 5848 WD* 00 17 49.2488922216 -00 09 55.491215796   16.5       DA+dMe 17 0
6 GALEX J001855.1+002135 ** 00 18 55.2025642416 +00 21 34.442182476           DA+dM 8 0
7 GALEX J002251.5-002720 ** 00 22 51.6343807512 -00 27 21.013187652           D+M4.5 7 0
8 PB 6036 ** 00 34 16.1841958800 -00 08 49.936553736   17       DA+K 6 0
9 GALEX J003627.9-003124 ** 00 36 28.0640184288 -00 31 24.959022456           DA+M3.5 9 0
10 GALEX J004138.6+151105 WD* 00 41 38.6861485584 +15 11 05.224810344           DA+M 11 0
11 GALEX J005208.3-005134 ** 00 52 08.4284616336 -00 51 34.651603080           DA+dMe 18 0
12 GALEX J005245.1-005337 WD* 00 52 45.1155098856 -00 53 37.527493848           DA+dMe 25 0
13 GALEX J005457.6-002517 WD* 00 54 57.6192143328 -00 25 17.104219752           DA+M 21 0
14 GALEX J010341.6+003132 ** 01 03 41.5965166584 +00 31 32.264280588           DA+M 9 0
15 GALEX J010345.5+003747 ** 01 03 45.5524218576 +00 37 46.758238896           DC+M9 15 0
16 SDSS J010647.93+151327.9 WD* 01 06 47.9307074976 +15 13 27.843130488           DQ 17 0
17 GALEX J011009.1+132617 ** 01 10 09.0943093512 +13 26 16.376271612           DA+dMe 37 0
18 PB 6348 WD* 01 15 47.5826501784 +00 53 50.138995380           DA4.5+M: 21 0
19 SDSS J013335.55+130357.2 WD* 01 33 35.5483851240 +13 03 57.074436360           DA+dMe 14 0
20 SDSS J020351.29+004025.1 ** 02 03 51.2915781048 +00 40 25.034793636           DA+dM 15 0
21 SDSS J020538.12+005835.3 ** 02 05 38.10960 +00 58 35.1336           DZA+dM 11 0
22 UCAC4 452-002718 PM* 02 08 06.3040117416 +00 18 34.677083916   16.77 15.58 15.42   M5Ve 13 0
23 GALEX J020806.4+001834 WD* 02 08 06.4224824856 +00 18 33.945744960           DA 14 0
24 SDSS J020845.50+003248.5 ** 02 08 45.5084479512 +00 32 48.451266420           D+M4 7 0
25 GALEX J021239.4+001856 ** 02 12 39.4570480536 +00 18 56.986986636           DA+dM 14 0
26 SDSS J021309.20-005025.5 ** 02 13 09.1979419008 -00 50 25.369115064           DA+M3 14 0
27 GALEX J021855.2+011056 ** 02 18 55.2745632696 +01 10 56.439625224           DA+M 8 0
28 SDSS J021940.25+003207.8 ** 02 19 40.2612706104 +00 32 08.164115196           DA+M 12 0
29 GALEX J022125.3+001710 ** 02 21 25.3766177400 +00 17 10.058242776           DA+M 9 0
30 GALEX J022213.2+002706 WD* 02 22 13.2769065133 +00 27 07.146796714           DC 6 0
31 SDSS J022503.03+005456.3 ** 02 25 03.0355719744 +00 54 56.185846380           DC+dM 21 0
32 GALEX J023112.9-004055 ** 02 31 13.0274104008 -00 40 57.164134692           DA+dMe 9 0
33 SDSS J023650.60-010313.3 ** 02 36 50.6077490952 -01 03 13.338576936   18.7       DA+M 18 0
34 2MASS J02464256+0041372 ** 02 46 42.5574093864 +00 41 37.120650540           dMe+DA 25 0
35 GALEX J025141.8-004128 ** 02 51 41.9157186576 -00 41 29.927652900           DA+dM 12 0
36 GALEX J025147.8-000001 ** 02 51 47.8462529232 -00 00 03.253100652           DA+M 9 0
37 PB 6908 WD* 02 52 02.4622935936 -01 05 15.762102432           DA 26 0
38 SDSS J025202.57-010515.4 LM* 02 52 02.5758904200 -01 05 15.412653384           M0 5 0
39 SDSS J025241.33+005500.8 ** 02 52 41.33210 +00 55 00.8598           D?+M? 6 0
40 SDSS J025509.30-004414.9 ** 02 55 09.30528 -00 44 14.9352           DA+dMe 10 0
41 GALEX J025747.8+004902 ** 02 57 47.7966321936 +00 49 02.253743868           DA+M4 10 0
42 GALEX J025753.3-003159 WD* 02 57 53.4010206672 -00 31 59.746886364           DA4+M: 16 0
43 PB 6955 ** 02 58 17.9007882144 +01 09 45.875007036   18.29 18.30     DA+dMe 32 0
44 GALEX J030351.9+003549 ** 03 03 51.9718320192 +00 35 48.391109664           DA+dMe 14 0
45 GALEX J030859.8-002735 ** 03 08 59.8636592112 -00 27 35.760291912           DA+dM 14 0
46 SDSS J030904.82-010100.9 ** 03 09 04.8249448032 -01 01 00.953569632           DA+dM 13 0
47 GALEX J031404.9-011135 ** 03 14 04.9810836408 -01 11 36.684555504   20.02 19.43     DA:+dMe 17 0
48 GALEX J031916.6-001244 WD* 03 19 16.5981307368 -00 12 44.972139960           DA 10 0
49 GALEX J031957.7-005803 ** 03 19 57.7832276520 -00 58 03.309245544           DA+M 13 0
50 GALEX J032136.5-001630 ** 03 21 36.5507578032 -00 16 30.543251160           DA+M 19 0
51 GALEX J032355.7+003501 WD* 03 23 55.8468965280 +00 35 02.639484456           DA 6 0
52 SDSS J032422.38-000516.1 ** 03 24 22.3943523072 -00 05 16.118794356           DA+M 16 0
53 SDSS J032430.24+001908.9 ** 03 24 30.2442389568 +00 19 08.600400480           DA+M4 8 0
54 UCAC4 445-004604 * 03 25 10.6559171712 -01 11 14.469907740   16.62 15.55 15.57   M1.25 14 0
55 SDSS J032510.84-011114.2 WD* 03 25 10.8458031144 -01 11 14.249282496           DA 21 0
56 GALEX J032607.9+011020 ** 03 26 07.9776239616 +01 10 21.181886652           DA+M 11 0
57 SDSS J032643.22-010338.0 ** 03 26 43.2225189552 -01 03 37.943482680           DA+M2.5 11 0
58 SDSS J032726.73-005745.0 ** 03 27 26.7351942936 -00 57 44.950408740           D+M4.25 7 0
59 GALEX J032758.1-002215 ** 03 27 58.1588416176 -00 22 15.448148436           DA+dM 14 0
60 GALEX J032842.9+001749 ** 03 28 42.9297693600 +00 17 49.742927880           DA+dM 18 0
61 GALEX J032947.1+010050 WD* 03 29 47.1068620224 +01 00 50.229004500           DA 9 0
62 SDSS J033548.59+003832.3 ** 03 35 48.5932191600 +00 38 31.954895088           DA+M 21 0
63 GALEX J033622.0-000146 ** 03 36 22.0143232320 -00 01 46.741199088           DA+M 14 0
64 GALEX J033648.3-000633 WD* 03 36 48.3368718600 -00 06 34.305853932   17.4   18.1   DA 19 0
65 GALEX J033807.6-000713 ** 03 38 07.6337447664 -00 07 15.233356128           DA+M1 9 0
66 V* RR Cae WD* 04 21 05.5631820426 -48 39 07.061113433 14.50 14.92 14.40     DA7.8 168 1
67 GALEX J075606.3+421612 WD* 07 56 06.3634519800 +42 16 13.087722144   18.61 19.20     DO+dM: 18 0
68 SDSS J080342.86+425652.7 ** 08 03 42.86304 +42 56 52.6776           D:+M 9 0
69 GALEX J080650.8+484015 ** 08 06 50.8190332176 +48 40 14.479719600           D:+Me 10 0
70 GALEX J081716.9+054223 WD* 08 17 16.9821140184 +05 42 23.605343640           DA+dM 14 0
71 GALEX J082022.0+431411 WD* 08 20 22.0284888048 +43 14 11.129171964           DA+M 26 0
72 GALEX J085930.9+580904 WD* 08 59 31.0592221416 +58 09 05.482987092           DA+dM 12 0
73 SDSS J090439.85+562141.9 ** 09 04 39.8587725048 +56 21 41.943379932           DA+M 14 0
74 GALEX J093124.3+374527 ** 09 31 24.3733224072 +37 45 27.531195300           DA+M 7 0
75 US 738 ** 09 35 06.9270091560 +44 11 06.938394720   17.7   17.8   DA+M 44 0
76 GALEX J094058.9+000239 WD* 09 40 58.98936 +00 02 39.8724           DA+M 10 0
77 SDSS J094652.48+000723.1 ** 09 46 52.4837084112 +00 07 23.102593752           D+M 7 0
78 SBSS 0945+578 WD* 09 48 53.9908884192 +57 39 57.532176504   17.5       DA+dMe 22 0
79 SDSS J095723.83+020734.5 ** 09 57 23.82768 +02 07 34.4316   18.7   19.0   DA+M 14 0
80 V* WX LMi CV* 10 26 27.4933431861 +38 45 02.655728034   18   16.77   M5.0 56 0
81 GALEX J104057.5+083422 WD* 10 40 57.4820667768 +08 34 21.636104556           DA+M 15 0
82 GALEX J104107.6+092104 WD* 10 41 07.6715304792 +09 21 03.371480280           DA+dMe 15 0
83 2QZ J113800.3-001145 ** 11 38 00.35040 -00 11 44.4696   18.95       DA+M 22 0
84 GALEX J115157.0-000725 WD* 11 51 56.9492345280 -00 07 25.478219460   18.39       DA5+M 25 0
85 GALEX J115237.0+002141 WD* 11 52 36.9852644016 +00 21 41.886041652           DA+dM 21 0
86 2QZ J121033.7-004645 WD* 12 10 33.76896 -00 46 44.4756   18.72       DC+M3 19 0
87 FOCAP QNY4:59 WD* 12 38 36.3501064113 -00 40 42.182830069   17.58       DA1 28 0
88 2QZ J123922.3+005548 ** 12 39 22.3346781600 +00 55 48.525009276   19.48 19.4     DA3.0+dM 19 0
89 2QZ J132652.6+000856 ** 13 26 52.6257385872 +00 08 55.348512720   20.23       DA+M 12 0
90 V* DE CVn ** 13 26 53.2712830008 +45 32 46.685746104   14.23 12.96 12.59   M3V+DA 64 0
91 SDSS J133130.27+662304.9 WD* 13 31 30.2665837704 +66 23 04.908749856           DA+M 17 0
92 SDSS J133645.56-002231.2 RR* 13 36 45.5671689648 -00 22 31.248233112           DA+dM 7 0
93 SDSS J133918.03+593752.5 ** 13 39 17.97576 +59 37 52.7844           DA+dM 8 0
94 V* QS Vir SB* 13 49 52.0029035208 -13 13 37.000132212 14.27 14.98 14.40 14.37   DA3+dM 147 1
95 SDSS J143746.69+573706.0 ** 14 37 46.6892252136 +57 37 06.057895512           DA+dMe 15 0
96 LBQS 1437-0053 CV* 14 39 47.6208102216 -01 06 06.781449132           DA1+Me 32 0
97 SDSS J145300.99+005557.1 ** 14 53 00.9843211560 +00 55 57.091992312           DA+dMe 18 0
98 SDSS J145752.59+031043.0 ** 14 57 52.6079911992 +03 10 43.101423912           D+M 6 0
99 LP 621-58 WD* 15 02 31.66080 +01 10 46.3224   18.2   18.3 17.59 DA+dMe 26 0
100 UCAC4 655-057382 SB* 15 10 45.6069322824 +40 48 27.172339956   16.47 15.45 15.29   dMe 14 0
101 GALEX J151045.6+404826 WD* 15 10 45.7011298776 +40 48 26.786257920           DA 13 0
102 GALEX J152933.2+002031 WD* 15 29 33.2587800336 +00 20 31.217685504           DA4+M: 33 0
103 SDSS J154219.45+032311.0 ** 15 42 19.44672 +03 23 11.0112           DA+dM 14 0
104 GALEX J154543.3+330709 ** 15 45 43.3114450512 +33 07 08.462762436   19.6   18.8   DA+dMe 6 0
105 SDSS J154652.14+492215.9 ** 15 46 52.1499995280 +49 22 15.945296124           DA+M 11 0
106 V* NN Ser RS* 15 52 56.1203524080 +12 54 44.429312196     16.51     DAO1+M4 287 0
107 SDSS J161239.06+455132.2 WD* 16 12 39.0644455224 +45 51 32.290046964           DA+dM 14 0
108 SDSS J164757.73+371812.1 ** 16 47 57.7398745224 +37 18 12.101592276           D+M1 8 0
109 GALEX J171145.5+555445 ** 17 11 45.4151371824 +55 54 44.430058944           DA+M 19 0
110 SDSS J171611.13+544346.4 ** 17 16 11.1513168168 +54 43 46.461313524           DA+M 13 0
111 GALEX J172008.5+565212 ** 17 20 08.5794382848 +56 52 11.764586784           DA+M1.5 14 0
112 GALEX J172406.0+562004 CV* 17 24 06.1346969472 +56 20 03.087296880   15.65 16.24     DA+dMe 40 0
113 SDSS J172439.01+551559.9 ** 17 24 39.01872 +55 16 00.0264           DA+M 10 0
114 SDSS J172601.55+560527.1 ** 17 26 01.5465548184 +56 05 27.014805600           DA+dMe 15 0
115 GALEX J173548.3+541424 ** 17 35 48.3593294952 +54 14 24.390040992           DA+M 12 0
116 GALEX J173727.2+540352 WD* 17 37 27.2679478728 +54 03 52.281415116           DA+M 16 0
117 GALEX J174152.9+541027 ** 17 41 52.8692996664 +54 10 27.221602836           DA+M 11 0
118 SDSS J174214.72+541845.2 mul 17 42 14.71830 +54 18 45.2358           DA+dMe 15 0
119 GALEX J204431.4-061439 ** 20 44 31.4409828720 -06 14 40.216396704           DA+M1 15 0
120 SDSS J204746.17+000659.2 ** 20 47 46.17192 +00 06 59.3194           DA+M 7 0
121 RX J2130.6+4710 XB* 21 30 18.4670033976 +47 10 07.403693592           DA+M3.5/4Ve 32 0
122 PHL 4947 WD* 21 50 47.2784089743 -07 27 06.732773802           D+M0 6 0
123 GALEX J215132.5-071915 ** 21 51 32.5614097464 -07 19 14.940286896           DA+M: 16 0
124 SDSS J224139.03+002710.9 ** 22 41 39.0323653416 +00 27 11.043753192           DA+dMe 12 0
125 GALEX J224351.9+010952 ** 22 43 51.9935956344 +01 09 51.174114624           DA+M 9 0
126 SDSS J230552.08-001448.7 ** 23 05 52.0750140055 -00 14 48.886049240           M2+DA 7 0
127 GALEX J231014.5+001441 ** 23 10 14.6218907280 +00 14 39.975122652           DA+M 9 0
128 SDSS J231218.53+011233.1 ** 23 12 18.5420241240 +01 12 33.209457444           D+M3 6 0
129 GALEX J231814.7+003431 ** 23 18 14.7280342104 +00 34 30.344555208           DA+M 8 0
130 GALEX J231901.2-004949 WD* 23 19 01.2355378488 -00 49 49.553307372   18.7   19.1   DA+M 16 0
131 SDSS J232539.65-002420.7 LM* 23 25 39.6503199168 -00 24 20.771780076           M0 8 0
132 SDSS J232816.06+010036.0 ** 23 28 16.0659368760 +01 00 35.920231020           DA+M 7 0
133 GALEX J233537.1-005603 ** 23 35 37.1477579376 -00 56 01.603791744           D+M3 7 0
134 GALEX J233807.8+000109 ** 23 38 07.8845753232 +00 01 09.129042804           DA+M 10 0
135 GALEX J233905.9-001755 ** 23 39 06.0001771968 -00 17 54.613196556           DA+M3 16 0
136 GALEX J233928.3-002039 ** 23 39 28.3569467208 -00 20 40.174877724           DA+M 17 0
137 GALEX J234131.0+003749 ** 23 41 31.1026214832 +00 37 49.373349348           DA+dMe 16 0
138 GALEX J234436.2+001810 ** 23 44 36.3142959528 +00 18 12.420867816           DA+K: 4 0
139 GALEX J234459.6+002749 WD* 23 44 59.6270212008 +00 27 49.809003228           DC 14 0
140 2MASS J23445964+0027498 mul 23 44 59.72928 +00 27 49.8240           DC+M5 13 0
141 2SLAQ J234534.49-001453.7 ** 23 45 34.4980790664 -00 14 53.766878244           DA+M 12 0
142 SDSS J235020.76-002340.0 ** 23 50 20.7639571560 -00 23 40.088776164           M5.5+D 7 0

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