2017ApJS..232...23H


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.25CEST02:48:50

2017ApJS..232...23H - Astrophys. J., Suppl. Ser., 232, 23-23 (2017/October-0)

White dwarf rotation as a function of mass and a dichotomy of mode line widths: Kepler observations of 27 pulsating DA white dwarfs through K2 Campaign 8.

HERMES J.J., GANSICKE B.T., KAWALER S.D., GREISS S., TREMBLAY P.-E., GENTILE FUSILLO N.P., RADDI R., FANALE S.M., BELL K.J., DENNIHY E., FUCHS J.T., DUNLAP B.H., CLEMENS J.C., MONTGOMERY M.H., WINGET D.E., CHOTE P., MARSH T.R. and REDFIELD S.

Abstract (from CDS):

We present photometry and spectroscopy for 27 pulsating hydrogen-atmosphere white dwarfs (DAVs; a.k.a. ZZ Ceti stars) observed by the Kepler space telescope up to K2 Campaign 8, an extensive compilation of observations with unprecedented duration (>75 days) and duty cycle (>90%). The space-based photometry reveals pulsation properties previously inaccessible to ground-based observations. We observe a sharp dichotomy in oscillation mode line widths at roughly 800 s, such that white dwarf pulsations with periods exceeding 800 s have substantially broader mode line widths, more reminiscent of a damped harmonic oscillator than a heat-driven pulsator. Extended Kepler coverage also permits extensive mode identification: we identify the spherical degree of 87 out of 201 unique radial orders, providing direct constraints of the rotation period for 20 of these 27 DAVs, more than doubling the number of white dwarfs with rotation periods determined via asteroseismology. We also obtain spectroscopy from 4 m-class telescopes for all DAVs with Kepler photometry. Using these homogeneously analyzed spectra, we estimate the overall mass of all 27 DAVs, which allows us to measure white dwarf rotation as a function of mass, constraining the endpoints of angular momentum in low- and intermediate-mass stars. We find that 0.51-0.73 M white dwarfs, which evolved from 1.7-3.0 M ZAMS progenitors, have a mean rotation period of 35 hr with a standard deviation of 28 hr, with notable exceptions for higher-mass white dwarfs. Finally, we announce an online repository for our Kepler data and follow-up spectroscopy, which we collect at http://k2wd.org.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): stars: oscillations - stars: variables: general - white dwarfs - white dwarfs

VizieR on-line data: <Available at CDS (J/ApJS/232/23): table1.dat table2.dat table3.dat table5.dat>

Simbad objects: 50

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Number of rows : 50

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 EPIC 220453225 WD* 00 45 33.1561903703 +05 44 47.110939613           DA 2 0
2 PHL 862 WD* 00 51 24.2755691592 +03 39 04.075720222   17.7 17.9 18.0   DA 6 0
3 EPIC 220258806 WD* 01 06 37.0245858536 +01 45 03.040670139   16.1   16.5   DA 5 0
4 SDSS J011100.63+001807.1 WD* 01 11 00.6337462200 +00 18 07.060664070   18.85       DA 23 0
5 SDSS J011123.90+000935.2 ** 01 11 23.9134652958 +00 09 34.513933724           DA+M 16 0
6 EGGR 409 WD* 01 14 37.6542285316 +10 41 04.756788413   15.27 15.41 15.69   DB2.5 62 0
7 GD 842 WD* 01 22 34.6823853144 +00 30 26.033719696   17       DA 13 0
8 PG 0122+200 WD* 01 25 22.5118179721 +20 17 56.963251283   16.2   16.9   DOZ.7 104 0
9 V* ZZ Cet WD* 01 36 13.6155835488 -11 20 32.631811638   14.328 14.16 14.4   DA4.0 264 0
10 EPIC 210397465 WD* 03 58 24.2226018891 +13 24 31.030623493           DA 3 0
11 NGC 1501 PN 04 06 59.3919688584 +60 55 14.277444117   15.17 13.0     [WO4] 284 1
12 HL Tau 76 WD* 04 18 56.6380318051 +27 17 48.312463115   15.40       DA4.3 132 0
13 HS 0507+0434A WD* 05 10 13.9441055186 +04 38 38.433188110   14.14 14.22 14.46   DA4.1 22 0
14 SDSS J083203.98+142942.3 WD* 08 32 03.9853291369 +14 29 42.466680616           DA 7 0
15 SDSS J083702.16+185613.4 WD* 08 37 02.1687838066 +18 56 13.485669875           DA 9 0
16 EPIC 228682478 WD* 08 40 27.8459583970 +13 20 10.097438598           DA 2 0
17 LP 425-348 WD* 08 40 54.0378727286 +14 57 10.444888353       18.7   DA 10 0
18 EPIC 211494257 * 08 40 55.7167453785 +13 03 29.575095132           ~ 3 0
19 SDSS J085648.33+185804.9 WD* 08 56 48.3362128636 +18 58 04.819039910           DA 7 0
20 LB 9074 WD* 09 00 41.0909422672 +19 07 14.460544620   17.2   17.6   DA 9 0
21 V* RY LMi WD* 09 24 15.2484202569 +35 16 51.400826911   15.72   15.99   DA4 252 0
22 SDSS J112221.10+035822.4 WD* 11 22 21.0993316333 +03 58 22.472070267           DA 13 0
23 SDSS J113604.01-013658.2 WD* 11 36 04.0123492254 -01 36 58.146702893           DA 14 0
24 SDSS J113655.18+040952.6 ** 11 36 55.1801312403 +04 09 52.734345459   16.79 17.12     DA+M 23 0
25 V* IZ UMa WD* 11 39 41.4109194194 +42 05 18.427748207     16.56     DA4.1 33 0
26 SDSS J115126.14+052512.9 WD* 11 51 26.1444199317 +05 25 12.983951010   17.3   18.2   DA 4 0
27 PG 1149+058 WD* 11 51 54.2068266216 +05 28 39.584237596   15.14   15.07   DA4.4 37 0
28 V* GW Vir WD* 12 01 45.9728868857 -03 45 40.627851273   14.87 15.04     DOQZ1 470 0
29 Ton 1559 WD* 13 09 57.6765586750 +35 09 47.189084620   15.51   15.2   DA4.4 124 0
30 EPIC 229227292 WD* 13 42 11.6716678948 -07 35 38.520411705   16.9   16.5   DA 4 0
31 PG 1349+552 WD* 13 51 20.2511095296 +54 57 42.594177324   15.51       DA4.1 34 0
32 GD 165 WD* 14 24 39.1494933037 +09 17 14.161331419   14.46 14.32 14.6 14.91 DA4.1 153 0
33 V* MY Aps WD* 14 33 07.6357496582 -81 20 14.126849475   13.49 13.35 13.65   DA4.1 126 0
34 SDSS J161218.08+083028.2 WD* 16 12 18.0751818658 +08 30 28.324984485           DA 10 0
35 V* DN Dra WD* 16 48 25.6321433630 +59 03 22.663406299   12.34 12.17 12.44   DA4.0 200 0
36 KIC 7594781 WD* 19 08 35.8927942416 +43 16 42.230874207 17.84         DA 4 0
37 KIC 10132702 WD* 19 13 40.8870481839 +47 09 30.673965521 18.71         DA 4 0
38 KIC 4552982 WD* 19 16 43.8201464485 +39 38 49.359231408 17.362 17.60 17.72 17.93 17.72 DA 17 0
39 KIC 4357037 WD* 19 17 19.1726623591 +39 27 19.329077645 17.91         DA 5 0
40 EPIC 229228364 WD* 19 18 10.6699615792 -26 21 06.037063533           DA 2 0
41 PN A66 61 PN 19 19 10.2028390183 +46 14 51.974757707   17.05 17.39     DAO.57 51 0
42 KIC 11911480 WD* 19 20 24.8852795771 +50 17 21.053774618 17.701         DA 11 0
43 KIC 8626021 WD* 19 29 04.6789361529 +44 47 09.026641841   18.3   18.5   DB 26 0
44 V* PY Vul WD* 19 37 13.7502254298 +27 43 18.736648968   13.14   12.7   DA4.0 119 0
45 RE J1943+500 WD* 19 43 43.6810051071 +50 04 37.925436113     14.8     DA1.4 44 0
46 MWP 1 PN 21 17 08.2817539788 +34 12 27.415871206     12.33     PG1159 175 0
47 V* IR Peg WD* 21 34 08.2124719240 +06 50 57.662044329   16.15       PG1159 113 0
48 GALEX 2690876601040634866 WD* 22 20 24.2331137096 -09 33 31.141450045   16.6   17.0   DA 3 0
49 V* ZZ Psc WD* 23 28 47.6364608228 +05 14 54.234982405   13.17   13.0   DA4.1 448 0
50 GD 1212 WD* 23 38 50.7400676027 -07 41 19.970822561   13.44 13.26   13.24 DA4.5 42 0

    Equat.    Gal    SGal    Ecl

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2021.06.25-02:48:50

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