2019A&A...625A..87C


Query : 2019A&A...625A..87C

2019A&A...625A..87C - Astronomy and Astrophysics, volume 625A, 87-87 (2019/5-1)

The evolution of ultra-massive white dwarfs.

CAMISASSA M.E., ALTHAUS L.G., CORSICO A.H., DE GERONIMO F.C., MILLER BERTOLAMI M.M., NOVARINO M.L., ROHRMANN R.D., WACHLIN F.C. and GARCIA-BERRO E.

Abstract (from CDS):

Ultra-massive white dwarfs are powerful tools used to study various physical processes in the asymptotic giant branch (AGB), type Ia supernova explosions, and the theory of crystallization through white dwarf asteroseismology. Despite the interest in these white dwarfs, there are few evolutionary studies in the literature devoted to them. Here we present new ultra-massive white dwarf evolutionary sequences that constitute an improvement over previous ones. In these new sequences we take into account for the first time the process of phase separation expected during the crystallization stage of these white dwarfs by relying on the most up-to-date phase diagram of dense oxygen/neon mixtures. Realistic chemical profiles resulting from the full computation of progenitor evolution during the semidegenerate carbon burning along the super-AGB phase are also considered in our sequences. Outer boundary conditions for our evolving models are provided by detailed non-gray white dwarf model atmospheres for hydrogen and helium composition. We assessed the impact of all these improvements on the evolutionary properties of ultra-massive white dwarfs, providing updated evolutionary sequences for these stars. We conclude that crystallization is expected to affect the majority of the massive white dwarfs observed with effective temperatures below 40 000 K. Moreover, the calculation of the phase separation process induced by crystallization is necessary to accurately determine the cooling age and the mass-radius relation of massive white dwarfs. We also provide colors in the Gaia photometric bands for our H-rich white dwarf evolutionary sequences on the basis of new model atmospheres. Finally, these new white dwarf sequences provide a new theoretical frame to perform asteroseismological studies on the recently detected ultra-massive pulsating white dwarfs.

Abstract Copyright: © ESO 2019

Journal keyword(s): stars: evolution - stars: interiors - white dwarfs

VizieR on-line data: <Available at CDS (J/A+A/625/A87): 110hdef.dat 110hrich.dat 110gaia.dat 116hdef.dat 116hrich.dat 116gaia.dat 122hdef.dat 122hrich.dat 122gaia.dat 129hdef.dat 129hrich.dat 129gaia.dat>

CDS comments: Table 2 : SDSS J005047.61-002517.1 is a misprint between SDSS J005047.62-002316.9 and SDSS J005457.61-002517.1.

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 J000011.57-085008.4 WD* 00 00 11.5625888952 -08 50 08.360956500           DQ 10 0
2 SDSS J000052.44-002610.5 WD* 00 00 52.4467840032 -00 26 10.523491800           DQ 11 0
3 SDSS J000901.20+202606.8 WD* 00 09 01.2016404336 +20 26 06.814286880           DA 3 0
4 SDSS J001459.15+253616.3 WD* 00 14 59.1578785704 +25 36 16.402991040           DA 3 0
5 SDSS J002113.16+192433.6 WD* 00 21 13.160 +19 24 33.62           DA 3 0
6 SDSS J003608.73+180951.5 WD* 00 36 08.7391672296 +18 09 51.540241824           DA 3 0
7 SDSS J003652.69+291229.4 WD* 00 36 52.6872138120 +29 12 29.683855584           DA: 2 0
8 SDSS J004806.14+254703.5 WD* 00 48 06.1376002080 +25 47 03.479339292           DA 3 0
9 SDSS J004825.11+350527.9 WD* 00 48 25.0937207568 +35 05 28.142437812           DA 4 0
10 SDSS J004920.03-080141.7 WD* 00 49 20.0312784912 -08 01 41.840965380           DA 3 0
11 SDSS J005047.62-002316.9 WD* 00 50 47.6136522696 -00 23 16.896251616   18.0   18.4   DA 18 0
12 SDSS J005122.96+241801.1 WD* 00 51 22.9538732760 +24 18 01.041355584           DA 3 0
13 SDSS J005142.50+200208.6 WD* 00 51 42.500 +20 02 08.66           DA: 2 0
14 SDSS J005457.61-002517.1 ** 00 54 57.6192143328 -00 25 17.104219752           DA+M 19 0
15 SDSS J013514.18+200121.9 WD* 01 35 14.180 +20 01 21.97           DA 3 0
16 SDSS J013550.03-042354.5 WD* 01 35 50.0446029888 -04 23 54.406642164           DA 3 0
17 SDSS J013853.19+283207.1 WD* 01 38 53.1596458272 +28 32 07.010155356           DA 3 0
18 SDSS J015425.78+284947.7 WD* 01 54 25.780 +28 49 47.71           DA 3 0
19 GD 50 WD* 03 48 50.1859724280 -00 58 32.290187664 12.596 13.787 14.063 14.210 14.388 DA1.2 249 1
20 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16002 1
21 SDSS J072724.66+403622.0 WD* 07 27 24.6548384400 +40 36 22.956526512           DAH: 5 0
22 SDSS J084021.26+522217.9 WD* 08 40 21.2723240640 +52 22 17.830550496           DA 11 0
23 SDSS J090549.46+134507.8 WD* 09 05 49.4558588424 +13 45 07.776953784           DA 3 0
24 SDSS J093710.25+511935.1 WD* 09 37 10.2500444472 +51 19 34.748159664           DA: 3 0
25 SDSS J100944.29+302102.0 WD* 10 09 44.2964180832 +30 21 02.191799484           DA: 3 0
26 GALEX 2683769353583725939 WD* 10 19 07.1271143640 +48 48 06.055047720   18.4   18.2   DA 6 0
27 SDSS J102553.68+622929.4 WD* 10 25 53.6892950280 +62 29 29.142747024           DAH 3 0
28 SDSS J102720.47+285746.1 WD* 10 27 20.4776331648 +28 57 46.124167500           DA: 2 0
29 SDSS J104827.74+563952.6 WD* 10 48 27.7388220288 +56 39 52.373771352           DA: 3 0
30 SDSS J110036.93+665949.4 WD* 11 00 36.9851652504 +66 59 49.119649620           DA 4 0
31 SDSS J110054.91+230604.0 WD* 11 00 54.910 +23 06 04.01           DA 3 0
32 SDSS J110510.71+474804.0 WD* 11 05 10.7044902048 +47 48 04.078705716           DA 3 0
33 SDSS J111544.64+294249.5 WD* 11 15 44.6180130168 +29 42 49.918498812           DA 3 0
34 SDSS J112322.46+602940.0 WD* 11 23 22.4836980000 +60 29 40.789673124           DA 6 0
35 SDSS J122943.28+493451.4 WD* 12 29 43.2683385144 +49 34 51.062553840           DA: 2 0
36 WG 22 WD* 12 38 49.7811220835 -49 48 00.219515411   14.14 13.96     DA4.2 214 0
37 SDSS J130846.79+424119.6 WD* 13 08 46.7914623504 +42 41 19.599128376           DA: 3 0
38 SDSS J132208.52+551939.1 WD* 13 22 08.5643343504 +55 19 38.980686216           DAH 4 0
39 SDSS J145009.87+510705.2 WD* 14 50 09.8551013232 +51 07 05.135938284           DA 3 0
40 SDSS J150417.23+553900.4 WD* 15 04 17.2317611544 +55 39 00.337105404           DO: 2 0
41 SDSS J164642.67+483207.9 WD* 16 46 42.6523462224 +48 32 08.751321420           DA 4 0
42 LP 387-21 WD* 16 55 38.9124316776 +25 33 46.614146220   17.5   17.0   DA 18 0
43 GD 518 WD* 16 59 15.3799290528 +66 10 32.657977416   16.5   17.4   DA4.2 29 0
44 SDSS J171113.02+654158.4 WD* 17 11 12.9964161864 +65 41 58.280220204           DA 16 0
45 SDSS J222720.65+240601.3 WD* 22 27 20.6461885680 +24 06 01.542263508           DA 3 0
46 SDSS J224517.61+255043.7 WD* 22 45 17.610 +25 50 43.70           DA 3 0
47 SDSS J232257.27+252807.4 WD? 23 22 57.2580345720 +25 28 07.486734252           DA:: 3 0
48 SDSS J232512.07+154751.3 WD* 23 25 12.0709683168 +15 47 51.350574264           DA 5 0
49 SDSS J234044.83+091625.9 WD* 23 40 44.8133070648 +09 16 25.969360152           DA: 3 0
50 SDSS J234929.60+185119.5 WD* 23 49 29.6214965232 +18 51 19.949817780           DA: 3 0

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2022.05.28-08:24:33

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