2019AJ....158..242X

Query : 2019AJ....158..242X

2019AJ....158..242X - Astron. J., 158, 242-242 (2019/December-0)

Compositions of planetary debris around dusty white dwarfs.

XU S., DUFOUR P., KLEIN B., MELIS C., MONSON N.N., ZUCKERMAN B., YOUNG E.D. and JURA M.A.

Abstract (from CDS):

The photospheres of some white dwarfs (WDs) are "polluted" by accretion of material from their surrounding planetary debris. WDs with dust disks are often heavily polluted and high-resolution spectroscopic observations of these systems can be used to infer the chemical compositions of extrasolar planetary material. Here, we report spectroscopic observation and analysis of 19 WDs with dust disks or candidate disks. The overall abundance pattern very much resembles that of bulk Earth and we are starting to build a large enough sample to probe a wide range of planetary compositions. We found evidence for accretion of Fe-rich material onto two WDs as well as O-rich but H-poor planetary debris onto one WD. In addition, there is a spread in Mg/Ca and Si/Ca ratios and it cannot be explained by differential settling or igneous differentiation. The ratios appear to follow an evaporation sequence. In this scenario, we can constrain the mass and number of evaporating bodies surrounding polluted WDs.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): White dwarf stars - Chemical abundances - Circumstellar disks - Minor planets

CDS comments: Misprints: WD 1346+031 = WD 1341+036, WD 1551+171 = WD 1551+175.

Simbad objects: 37

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Number of rows : 37
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 PG 0010+281 WD* 00 13 21.0725461056 +28 20 19.823657640   15.50 15.69 15.96   DA1.9 30 0
2 Ton S 193 WD* 01 08 36.0345990648 -32 37 43.377234996   15.34 15.26 15.86   DAZ 41 0
3 GD 685 WD* 01 09 33.1581074544 -19 01 17.559336144   16.252 16.166 16.1   DA3.3 41 0
4 GD 40 WD* 03 02 53.1037481136 -01 08 33.798683976   15.479 15.384     DBZ4 187 0
5 HS 0307+0746 WD* 03 10 09.1588178784 +07 57 32.073855264   17.1   16.6   DAZ 33 0
6 GD 56 WD* 04 11 02.1686667960 -03 58 22.586865708   15.64 15.50 15.1   DA3.3 92 0
7 GD 61 WD* 04 38 39.3740627256 +41 09 32.353957332 13.801 14.767 14.879 14.932 14.970 DBAZ3 112 0
8 HE 0446-2531 WD* 04 49 01.4020207176 -25 26 36.268538172   16.9   16.5   DBAZ 26 0
9 GALEX J073842.6+183509 WD* 07 38 42.5662133112 +18 35 09.713206464           DBZ 67 0
10 SDSS J074153.45+314620.4 WD* 07 41 53.4241887864 +31 46 20.339459436           DZ 13 0
11 LP 545-12 WD* 08 23 03.8637313800 +05 46 56.424331596   18.3   16.7   DZ 23 0
12 Ton 345 WD* 08 45 39.1819378488 +22 57 28.251061956   15.2 16.07     DB 89 0
13 PG 0843+517 WD* 08 47 02.2880328360 +51 28 53.352123204   15.90       DA2.0 73 1
14 PG 1015+161 WD* 10 18 03.8273436048 +15 51 58.566029940   15.596 15.607 16.000   DA2.5 92 0
15 PG 1018+411 WD* 10 21 55.5083789112 +40 50 14.885878524   16.34 16.37 16.46 16.66 DA3 50 0
16 GALEX J104341.5+085558 WD* 10 43 41.5313708256 +08 55 58.340933400           DAZ 70 0
17 US 2966 WD* 11 47 58.6579026168 +28 31 56.012910348   17.8       DA 24 0
18 LBQS 1145+0145 WD* 11 48 33.6297189672 +01 28 59.420446860           DB 216 0
19 EC 11507-1519 WD* 11 53 15.2581290960 -15 36 36.506488428   16.16 16.00 15.9   DA4.0 61 0
20 GALEX J122859.9+104032 WD* 12 28 59.9341604496 +10 40 33.045988944           DAZe: 152 0
21 SBSS 1232+563 WD* 12 34 32.6764405872 +56 06 43.034240664   18.5       DBZA 44 0
22 SBSS 1240+527 WD* 12 42 31.0898339136 +52 26 26.609640108   18.2   18.2   DABZ 38 0
23 GALEX J134430.1+032423 WD* 13 44 30.1169704200 +03 24 23.226703632           DA 24 0
24 EGGR 360 WD* 13 47 24.3696354602 +10 21 38.013189353   15.49   14.8   DA7.1 104 0
25 HE 1350-1612 WD* 13 53 34.9627545960 -16 27 06.231136968   16.2   16.7   DBAZ 24 0
26 G 200-39 WD* 14 27 36.1747969268 +53 48 28.004467199   14.86 14.99 15.35   DBAZ4 109 0
27 EGGR 298 WD* 14 58 06.4884482642 +29 37 29.515263565   15.86   15.3   DA6.8 99 0
28 PG 1457-086 WD* 14 59 52.9901145672 -08 49 29.645894676   15.68 15.77 15.8   DA2.3 51 0
29 SBSS 1536+520 WD* 15 37 25.7250808728 +51 51 26.827045956           DBA 42 0
30 V* KX Dra WD* 15 41 44.8895982744 +64 53 52.977685920   15.562 15.523 15.658   DA4.2 60 1
31 KUV 15519+1730 WD* 15 54 09.0159230904 +17 21 24.189657732     17.5     DBA 37 1
32 GALEX J193156.8+011745 WD* 19 31 56.9316163968 +01 17 44.107104876     14.20     DAZ 79 1
33 GALEX J220934.8+122337 WD* 22 09 34.8505239024 +12 23 36.557630592           DB 34 0
34 G 241-6 WD* 22 23 33.1053008448 +68 37 24.282156972   15.7 15.65 15.7   DB 52 0
35 PHL 5103 WD* 22 24 17.4348213312 -16 15 47.161639476   16.30 16.02 16.25 15.90 DAZ 39 0
36 HS 2253+8023 WD* 22 54 35.7124764456 +80 39 53.794385208   16.02 16.11     DBAZ3.4 47 0
37 V* ZZ Psc WD* 23 28 47.6365087803 +05 14 54.235051503   13.217   13.106   DA4.1 536 0

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