2006A&A...446..237D


Query : 2006A&A...446..237D

2006A&A...446..237D - Astronomy and Astrophysics, volume 446, 237-257 (2006/1-4)

Whole Earth telescope observations of the ZZ Ceti star HL Tau 76.

DOLEZ N., VAUCLAIR G., KLEINMAN S.J., CHEVRETON M., FU J.N., SOLHEIM J.-E., GONZALEZ PEREZ J.M., ULLA A., FRAGA L., KANAAN A., REED M., KAWALER S., O'BRIEN M.S., METCALFE T.S., NATHER R.E., SANWAL D., KLUMPE E.W., MUKADAM A., WOOD M.A., AHRENS T.J., SILVESTRI N., SULLIVAN D., SULLIVAN T., JIANG X.J., XU D.W., ASHOKA B.N., LEIBOWITZ E., IBBETSON P., OFEK E., KILKENNY D., MEISTAS E.G., ALISAUSKAS D., JANULIS R., KALYTIS R., MOSKALIK P., ZOLA S., KRZESINSKI J., OGLOZA W., HANDLER G., SILVOTTI R. and BERNABEI S.

Abstract (from CDS):

This paper analyses the Whole Earth Telescope observations of HL Tau 76, the first discovered pulsating DA white dwarf. The star was observed during two Whole Earth Telescope campaigns. It was a second priority target during the XCOV13 campaign in 1996 and the first priority one during the XCOV18 campaign in 1999. The 1999 campaign reached 66.5% duty cycle. With a total duration of 18 days, the frequency resolution achieved is 0.68µHz. With such a frequency resolution, we were able to find as many as 78 significant frequencies in the power spectrum, of which 34 are independent frequencies after removal of all linear combinations. In taking into account other frequencies present during the 1996 WET campaign and those present in earlier data, which do not show up in the 1999 data set, we find a total of 43 independent frequencies. This makes HL Tau 76 the richest ZZ Ceti star in terms of number of observed pulsation modes. We use those pulsation frequencies to determine as much as possible of the internal structure of HL Tau 76. The pulsations in HL Tau 76 cover a wide range of periods between 380 s and 1390s. We propose an identification for 39 of those 43 frequencies in terms of l=1 and l=2 non-radial g-modes split by rotation. We derive an average rotation period of 2.2days. The period distribution of HL Tau 76 is best reproduced if the star has a moderately ``thick'' hydrogen mass fraction logqH≥-7.0. The results presented in this paper constitute a starting point for a detailed comparison of the observed periods with the periods calculated for models as representative as possible of HL Tau 76.

Abstract Copyright:

Journal keyword(s): stars: interiors - stars: individual: HL Tau 76 - stars: oscillations - stars: white dwarfs

Simbad objects: 19

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Number of rows : 19
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 V* ZZ Cet WD* 01 36 13.6153974672 -11 20 32.632874601   14.328 14.16 14.4   DA4.0 272 0
2 GD 1400 WD* 01 47 21.8246176800 -21 56 51.386849088   15.38 15.15 15.42   DA4.1 76 0
3 HL Tau 76 WD* 04 18 56.6378191680 +27 17 48.314513652   15.40       DA4.3 133 0
4 V* AF Pic WD* 05 33 06.7848149784 -56 03 53.377123392 15.42 16.40 16.28     DA4.3 26 0
5 V* RY LMi WD* 09 24 15.2482279632 +35 16 51.401570556   15.72   15.99   DA4 254 0
6 V* GW Vir WD* 12 01 45.9731868264 -03 45 40.628670300   14.87 15.04     DOQZ1 475 0
7 WG 22 WD* 12 38 49.7811220835 -49 48 00.219515411   14.14 13.96     DA4.2 214 0
8 HE 1258+0123 WD* 13 01 10.5155376720 +01 07 39.926449092   16.5 16.26 16.5   DA4.3 34 0
9 Ton 1559 WD* 13 09 57.6766028952 +35 09 47.187935136   15.51   15.2   DA4.4 124 0
10 SDSS J133831.75-002328.0 WD* 13 38 31.7495135568 -00 23 27.996154224           DA4 18 0
11 PG 1349+552 WD* 13 51 20.2509674304 +54 57 42.595932708   15.51       DA4.1 34 0
12 GD 165 WD* 14 24 39.1495824408 +09 17 14.160753960   14.46 14.32 14.6 14.91 DA4.1 154 0
13 V* MY Aps WD* 14 33 07.6366196272 -81 20 14.128475593   13.49 13.35 13.65   DA4.1 127 0
14 GD 358 WD* 16 47 18.3925183824 +32 28 32.862804384 12.511 13.530 13.653 13.752 13.852 DB2 334 0
15 V* DN Dra WD* 16 48 25.6318375106 +59 03 22.658985521   12.34 12.17 12.44   DA4.0 205 0
16 BPM 24754 WD* 17 19 01.0244255304 -54 46 16.960940940       15.81 15.48 DA4.5 27 1
17 MWP 1 PN 21 17 08.2817782392 +34 12 27.415995372     12.33     PG1159 179 0
18 V* ZZ Psc WD* 23 28 47.6365087803 +05 14 54.235051503   13.17   13.0   DA4.1 458 0
19 EGGR 405 WD* 23 49 53.4642375816 +13 06 12.922792560   15.9   16.3   DA4.4 44 0

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2022.05.24-10:31:33

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