1997A&A...323..819H


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.24CEST03:55:47

1997A&A...323..819H - Astronomy and Astrophysics, volume 323, 819-826 (1997/7-3)

Rotation velocities of white dwarf stars.

HEBER U., NAPIWOTZKI R. and REID I.N.

Abstract (from CDS):

The narrow Hα line cores observed with the Keck high resolution spectrograph of thirteen hydrogen-rich (DA) white dwarfs are analysed using line blanketed Non-LTE model atmospheres. The synthetic line profiles reproduce the observed line cores very well. Hence no evidence for additional line broadening due to rotation or to magnetic fields can be found. Statistical upper limits to the projected rotational velocities are derived by also taking into account inaccuracies of the atmospheric parameters. v sin i range from <8km/s (40 Eri B) to <43km/s (LB 5893). The programme stars sample almost the entire DA mass distribution indicating that the DA stars are slow rotators irrespective of their mass. Eight of our programme stars are members of the Hyades or Praesepe open clusters and have evolved from 2.5M to 3M mass stars. Our results add to a growing evidence that isolated white dwarfs are slowly rotating stars and that the angular momentum transfer from the core to the envelope of their precursors must have been efficient during post main sequence evolution (at least for masses of the order of 2.5M to 3.0M i.e. for Hyades and Praesepe stars).

Abstract Copyright:

Journal keyword(s): stars: rotation - stars: magnetic fields - stars: atmospheres - stars: white dwarfs

Simbad objects: 20

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Number of rows : 20

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 LP 349-13 WD* 00 24 34.7503601341 +27 42 05.864553265   16.2 16.86 16.3   DB 9 0
2 PG 0122+200 WD* 01 25 22.5118179721 +20 17 56.963251283   16.2   16.9   DOZ.7 102 0
3 HZ 4 WD* 03 55 21.9881493731 +09 47 18.134000893 13.917 14.592 14.506 14.58 14.642 DA3.4 173 0
4 NGC 1501 PN 04 06 59.3919688584 +60 55 14.277444117   15.17 13.0     [WO4] 280 1
5 EGGR 29 WD* 04 09 28.9036045636 +17 07 54.391379835 14.66 15.378 15.323 15.408 15.515 DA3.2 103 0
6 * omi02 Eri B WD* 04 15 21.786 -07 39 29.22 9.147 9.83 9.53     DA2.9 319 0
7 LAWD 18 WD* 04 23 55.6975604110 +16 21 15.120816077   14.33 14.27 14.79   DA2.5 93 0
8 LAWD 19 WD* 04 28 39.4101366129 +16 58 12.091706185   13.96 14.03 14.51   DA2.0 105 0
9 HZ 7 WD* 04 33 44.9627317246 +12 42 40.356206632   14.15 14.24 14.49   DA2.3 108 0
10 HZ 14 WD* 04 41 01.7398593372 +10 59 39.999082566   13.68 13.86     DA1.8 105 0
11 LP 207-7 WD* 07 29 29.5283330495 +39 10 12.092697639   16.00 15.82     DA3.8 17 0
12 LB 5893 WD* 08 39 36.4896159780 +19 30 43.655112827 16.70 17.57 17.63   18.00 DA2.5 31 0
13 EGGR 61 WD* 08 40 28.0939553309 +19 43 34.488028020   17.6 17.66 17.7   DA 47 0
14 EGGR 904 WD* 08 56 18.9478068190 +16 11 03.745447923   15.78 15.81     DB2 45 1
15 EGGR 185 WD* 11 45 56.6700338736 +31 49 30.693314751   13.66 13.60 14.0   DA3.1 64 1
16 V* GW Vir WD* 12 01 45.9728868858 -03 45 40.627851273   14.87 15.04     DOQZ1 464 0
17 HZ 43 ** 13 16 21.85329 +29 05 55.3793   12.52 12.66     DAwk+M3.5Ve 450 0
18 GD 358 WD* 16 47 18.3926893312 +32 28 32.865420612 12.511 13.530 13.653 13.752 13.852 DB2 316 0
19 G 142-B2B WD* 19 13 38.6750932557 +13 36 27.363375150 13.52     14.47   DA3.6 43 0
20 G 142-B2A PM* 19 13 39.2394073554 +13 36 11.610553228       12.391   M2V 12 0

    Equat.    Gal    SGal    Ecl

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2020.10.24-03:55:47

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