2017ApJS..232...23H


Query : 2017ApJS..232...23H

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 - 2022
#notes
1 SDSS J004533.15+054446.9 WD* 00 45 33.1556110008 +05 44 47.116299192           DA 3 0
2 PHL 862 WD* 00 51 24.2754891168 +03 39 04.074890040   17.7 17.9 18.0   DA 7 0
3 2MASS J01063703+0145030 WD* 01 06 37.0246284648 +01 45 03.041691084   16.1   16.5   DA 6 0
4 SDSS J011100.63+001807.1 WD* 01 11 00.6333109704 +00 18 07.059676176   18.85       DA 25 0
5 SDSS J011123.90+000935.2 ** 01 11 23.9144080176 +00 09 34.493125068           DA+M 16 0
6 EGGR 409 WD* 01 14 37.6538960064 +10 41 04.757053956   15.27 15.41 15.69   DB2.5 66 0
7 GD 842 WD* 01 22 34.6824285216 +00 30 26.030871324   17       DA 14 0
8 PG 0122+200 WD* 01 25 22.5121704552 +20 17 56.963079924   16.2   16.9   DOZ.7 107 0
9 V* ZZ Cet WD* 01 36 13.6153974672 -11 20 32.632874601   14.328 14.16 14.4   DA4.0 274 0
10 SDSS J035824.23+132430.7 WD* 03 58 24.2227252368 +13 24 31.034752164           DA 4 0
11 NGC 1501 PN 04 06 59.3920909320 +60 55 14.278542024   15.17 13.0     [WO4] 288 1
12 HL Tau 76 WD* 04 18 56.6378191680 +27 17 48.314513652   15.40       DA4.3 134 0
13 HS 0507+0434A WD* 05 10 13.9441357968 +04 38 38.436217584   14.14 14.22 14.46   DA4.1 25 0
14 SDSS J083203.98+142942.3 WD* 08 32 03.9841213848 +14 29 42.471775716           DA 7 0
15 SDSS J083702.16+185613.4 WD* 08 37 02.1679561368 +18 56 13.487529660           DA 10 0
16 SDSS J084027.83+132009.9 WD* 08 40 27.8451427344 +13 20 10.105829196           DA 3 0
17 LP 425-348 WD* 08 40 54.0377862253 +14 57 10.440198020       18.7   DA 11 0
18 SDSS J084055.72+130329.5 WD? 08 40 55.7166661296 +13 03 29.577683484           ~ 4 0
19 SDSS J085648.33+185804.9 WD* 08 56 48.3364811928 +18 58 04.821463704           DA 8 0
20 LB 9074 WD* 09 00 41.0906337360 +19 07 14.459719476   17.2   17.6   DA 10 0
21 V* RY LMi WD* 09 24 15.2482279632 +35 16 51.401570556   15.72   15.99   DA4 257 0
22 SDSS J112221.10+035822.4 WD* 11 22 21.0990341784 +03 58 22.467525312           DA 14 0
23 SDSS J113604.01-013658.2 WD* 11 36 04.0123445616 -01 36 58.140414180           DA 15 0
24 SDSS J113655.18+040952.6 ** 11 36 55.1800730112 +04 09 52.730905968   16.79 17.12     DA+M 23 0
25 V* IZ UMa WD* 11 39 41.4106847280 +42 05 18.429389196     16.56     DA4.1 34 0
26 SDSS J115126.14+052512.9 WD* 11 51 26.1442094424 +05 25 12.984493008   17.3   18.2   DA 5 0
27 PG 1149+058 WD* 11 51 54.2067404280 +05 28 39.584467236   15.14   15.07   DA4.4 39 0
28 V* GW Vir WD* 12 01 45.9731868264 -03 45 40.628670300   14.87 15.04     DOQZ1 476 0
29 Ton 1559 WD* 13 09 57.6766028952 +35 09 47.187935136   15.51   15.2   DA4.4 125 0
30 2MASS J13421165-0735383 WD* 13 42 11.6718075864 -07 35 38.518857024   16.9   16.5   DA 5 0
31 PG 1349+552 WD* 13 51 20.2509674304 +54 57 42.595932708   15.51       DA4.1 35 0
32 GD 165 WD* 14 24 39.1495824408 +09 17 14.160753960   14.46 14.32 14.6 14.91 DA4.1 156 0
33 V* MY Aps WD* 14 33 07.6366196272 -81 20 14.128475593   13.49 13.35 13.65   DA4.1 129 0
34 SDSS J161218.08+083028.2 WD* 16 12 18.0751139616 +08 30 28.324213992           DA 11 0
35 V* DN Dra WD* 16 48 25.6318375106 +59 03 22.658985521   12.34 12.17 12.44   DA4.0 207 0
36 KIC 7594781 WD* 19 08 35.8930037160 +43 16 42.235023252 17.84         DA 5 0
37 KIC 10132702 WD* 19 13 40.8876081048 +47 09 30.675488292 18.71         DA 5 0
38 SDSS J191643.83+393849.7 WD* 19 16 43.8197701440 +39 38 49.362598824 17.362 17.60 17.72 17.93 17.72 DA 18 0
39 SDSS J191719.16+392718.8 WD* 19 17 19.1726542032 +39 27 19.329494976 17.91         DA 6 0
40 DENIS J191810.6-262106 WD* 19 18 10.6704057552 -26 21 06.043406328         17.862 DA 3 0
41 PN A66 61 PN 19 19 10.2027282696 +46 14 51.973821276   17.05 17.39     DAO.57 55 0
42 KIC 11911480 WD* 19 20 24.8851862736 +50 17 21.048520956 17.701         DA 12 0
43 GALEX J192904.6+444708 WD* 19 29 04.6788742824 +44 47 09.028359420   18.3   18.5   DB 34 0
44 V* PY Vul WD* 19 37 13.7502269447 +27 43 18.733503670   13.14   12.7   DA4.0 123 0
45 RE J1943+500 WD* 19 43 43.6811875272 +50 04 37.921728648     14.8     DA1.4 45 0
46 MWP 1 PN 21 17 08.2817782392 +34 12 27.415995372     12.33     PG1159 180 0
47 V* IR Peg WD* 21 34 08.2124719240 +06 50 57.662044329   16.15       PG1159 115 0
48 GALEX 2690876601040634866 WD* 22 20 24.2332490016 -09 33 31.137802668   16.6   17.0   DA 4 0
49 V* ZZ Psc WD* 23 28 47.6365087803 +05 14 54.235051503   13.17   13.0   DA4.1 466 0
50 GD 1212 WD* 23 38 50.7400887024 -07 41 19.970752560   13.44 13.26   13.24 DA4.5 44 0

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2022.10.02-20:22:26

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