2022A&A...666L...7B


Query : 2022A&A...666L...7B

2022A&A...666L...7B - Astronomy and Astrophysics, volume 666, L7 (2022/10-1)

Missing metals in DQ stars: A simple explanation.

BLOUIN S.

Abstract (from CDS):

Classical DQ stars are white dwarfs whose atmospheres contain detectable traces of carbon brought up to the surface by a convective dredge-up process. Intriguingly, unlike other white dwarf spectral classes, DQ stars virtually never show signs of external pollution by elements heavier than carbon. In this Letter, we solve this long-standing problem by showing that the absence of detectable external pollution in DQ stars is naturally explained by the impact of metal accretion on the atmospheric structure of the white dwarf. A DQ star that accretes heavy elements sees its atmospheric density decrease, which leads to a sharp drop in the molecular carbon abundance and a strong suppression of the C2 Swan bands. We show that a typical DQ star that accretes heavy elements from planetary material generally transforms directly into a DZ star.

Abstract Copyright: © S. Blouin 2022

Journal keyword(s): planetary systems - stars: abundances - stars: atmospheres - white dwarfs

Simbad objects: 66

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Number of rows : 66
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 PB 5726 WD* 00 05 57.2293094616 +00 18 33.254665308   19   19.3   DZ 19 0
2 PB 8392 WD* 00 36 01.3736994072 -11 12 14.011540812   17       DZ 20 0
3 SDSS J004123.58+151109.0 WD* 00 41 23.5897086360 +15 11 09.100956660           DZ 12 0
4 2SLAQ J011338.35-000632.9 WD* 01 13 38.3633838624 -00 06 32.860193832           DZ 9 1
5 SDSS J012339.77+132433.4 WD* 01 23 39.7604984400 +13 24 33.546773952           DZ 10 0
6 GALEX J022851.9-000939 WD* 02 28 51.9731656416 -00 09 38.810667816           DZ 12 0
7 GALEX J074743.5+400110 WD* 07 47 43.5583538424 +40 01 10.027148556           DZ 13 0
8 GALEX J082720.5+330439 WD* 08 27 20.5906592856 +33 04 38.096829588           DZ+M: 9 0
9 LSPM J0834+4641 WD* 08 34 34.6666883112 +46 41 30.717944304   18.8   18.9   DZ 13 0
10 SDSS J083556.32+090619.4 WD* 08 35 56.3132370456 +09 06 19.626541128           DZ 10 0
11 GALEX J084502.7+411547 WD* 08 45 02.7196229256 +41 15 47.594372472           DZ+M 8 0
12 GALEX J084525.0+535208 WD* 08 45 24.9992340792 +53 52 08.771970936           DZ 12 0
13 GALEX J084709.1+450734 WD* 08 47 09.1251499440 +45 07 34.917899340           DZ+M 9 0
14 GALEX J084827.9+521421 WD* 08 48 28.0084599600 +52 14 22.366890960           DZ 14 0
15 GALEX J084849.4+354858 WD* 08 48 49.4309786208 +35 48 58.070738052           DZ 14 0
16 SDSS J084906.69+071030.0 WD* 08 49 06.6920007984 +07 10 30.028604268           DZ 7 0
17 SDSS J085141.72+053852.1 WD* 08 51 41.7269071368 +05 38 52.112760900           DZ+M: 8 0
18 GALEX J090517.7+013307 WD* 09 05 17.7126683568 +01 33 07.595392608           DZ 11 0
19 GALEX J090556.1+523533 WD* 09 05 56.2192005216 +52 35 33.045996084           DZ 12 0
20 SDSS J091640.53+011006.5 WD* 09 16 40.5310280016 +01 10 06.502471176           DA 11 0
21 SDSS J093210.54+485601.7 WD* 09 32 10.5514297992 +48 56 01.708900692           DZ+M: 8 0
22 GALEX J095119.9+403322 WD* 09 51 19.8681710256 +40 33 22.567488660           DZ 16 1
23 GALEX J095645.1+591241 WD* 09 56 45.1467202896 +59 12 40.638553884           DZA 26 0
24 GALEX J100406.6+423154 WD* 10 04 06.6520908144 +42 31 51.481075980           DZ+M 9 0
25 GALEX J100421.2+045117 WD* 10 04 21.2531681808 +04 51 17.267929740           DZ 8 0
26 GALEX J100823.7+024840 WD* 10 08 23.7469918920 +02 48 40.110759432           DZ 14 0
27 GALEX J101007.8+394853 WD* 10 10 07.8508665024 +39 48 52.320174876           DZ 10 0
28 GALEX J103126.2+120340 WD* 10 31 26.1975654216 +12 03 40.525295184           DZ 11 0
29 GALEX J103300.1+624748 WD* 10 33 00.1290497040 +62 47 47.890894308           DZ 12 0
30 GALEX J103809.1-003622 WD* 10 38 09.1869876816 -00 36 22.450492872   17.3   16.7   DZ 24 0
31 LP 168-8 WD* 10 39 41.8963229064 +46 12 24.540140124   19.5   19.0   DZ 15 0
32 LSPM J1049+5154 WD* 10 49 11.5384929312 +51 54 23.821337700   19.2   17.9   DZ 16 0
33 LP 93-176 WD* 10 56 41.7295379808 +57 14 49.103246760           DZ+M 17 0
34 GALEX J112617.1+524155 WD* 11 26 17.1786410328 +52 41 55.126794624           DZ 11 0
35 2QZ J112956.9-015230 WD* 11 29 56.9897057568 -01 52 29.614463616   19.40       DZA 12 0
36 LSPM J1137+0343 WD* 11 37 11.2981950672 +03 43 24.916537164   17.8   17.8   DZ 15 0
37 LSPM J1147+4928 WD* 11 47 12.2339022096 +49 28 01.068164544   19.2   18.4   DZ+M 14 0
38 GALEX J121218.6+540939 WD* 12 12 18.6983806560 +54 09 38.680745004           DZ 11 0
39 GALEX J122733.2+633027 WD* 12 27 33.4549601400 +63 30 29.446148988           DZ 18 1
40 2QZ J124006.4-003702 WD* 12 40 06.3542503800 -00 37 00.954220260   18.53       DZ 18 0
41 LP 616-31 WD* 12 54 13.7878426608 -02 36 08.533004940           DZ 20 0
42 GALEX J130746.2+030740 WD* 13 07 46.3411356816 +03 07 41.953284156           DZ 13 0
43 PB 85 WD* 13 09 05.2497219312 +49 13 59.854226664   17.5       DZ 15 0
44 LB 2597 WD* 13 13 37.0307276420 +57 38 01.618008400   16.7   16.8   DZ 30 0
45 2QZ J134144.0-011239 WD* 13 41 44.0989828560 -01 12 38.320367904   19.78       DZ 15 0
46 GALEX J134227.0+052249 WD* 13 42 26.9341702152 +05 22 48.644432796           DZ 12 0
47 SDSS J135137.07+613607.0 WD* 13 51 37.0704057336 +61 36 07.172178300           DC 10 0
48 SDSS J135637.78+404703.4 WD* 13 56 37.8051559416 +40 47 03.463636956           DZ 11 0
49 2QZ J140445.1-023238 WD* 14 04 45.1132763904 -02 32 37.275824976   19.47       DZ 14 0
50 GALEX J141426.5-011353 WD* 14 14 26.5454572824 -01 13 54.632495748           DZ 17 0
51 GALEX J142516.4-005048 WD* 14 25 16.4268418176 -00 50 48.821506872           DZ 18 0
52 LP 620-50 WD* 14 40 22.5489137688 -02 32 22.262660736     18.49     DZ 14 0
53 GALEX J153129.2+424015 WD* 15 31 29.2762537392 +42 40 15.770150292           DZ 15 0
54 SDSS J154025.17+514921.5 WD* 15 40 25.1785274040 +51 49 21.778366620           DZ+M: 8 0
55 GALEX J154623.0+392724 WD* 15 46 23.0739979272 +39 27 23.602218696           DZ 8 0
56 GALEX J154953.2+023928 WD* 15 49 53.2547379432 +02 39 29.673679104           DZ 10 0
57 SDSS J155852.59+031242.9 WD* 15 58 52.5972944568 +03 12 42.943974192           DZ 12 0
58 SDSS J164026.65+315453.9 WD* 16 40 26.6546801472 +31 54 53.734334940           DZ 11 0
59 GALEX J165741.6+373823 WD* 16 57 41.5934867040 +37 38 24.174442104           DZ+M: 10 0
60 GALEX J171513.6+280405 WD* 17 15 13.6400667048 +28 04 03.865758780           DZ 10 0
61 SDSS J210303.47-010842.5 WD* 21 03 03.4803123816 -01 08 42.385112700           DZ 7 0
62 GALEX J210734.0-005557 WD* 21 07 33.9185731512 -00 55 57.667874880           DZ 14 1
63 GALEX J212424.6-011454 WD* 21 24 24.7024550112 -01 14 52.449762012           DZ+M: 13 0
64 PM J22280+1207 WD* 22 28 02.0566551408 +12 07 33.384146268           DZ 22 0
65 SDSS J223222.31+010920.6 WD* 22 32 22.3222518864 +01 09 20.774501244           DZ 10 0
66 GALEX J223841.0+010150 WD* 22 38 41.0549049744 +01 01 50.437777260           DZ 10 0

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