2022ApJ...936....5W

Query : 2022ApJ...936....5W

2022ApJ...936....5W - Astrophys. J., 936, 5 (2022/September-1)

Extremely Low-mass White Dwarf Stars Observed in Gaia DR2 and LAMOST DR8.

WANG K., NEMETH P., LUO Y., CHEN X., JIANG Q. and CAO X.

Abstract (from CDS):

We present the first results from our ongoing project to study extremely low-mass (ELM) white dwarfs (WDs) (M ≤ 0.3M☉) with the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) spectra. Based on the LAMOST DR8 spectral database, we analyzed 136 ELM WD candidates selected from Gaia DR2 data and 12 known objects previously identified by the ELM Survey. The atmospheric parameters and radial velocities of these stars were obtained by fitting the LAMOST low-resolution spectra. After comparing the atmospheric parameters of the 12 known objects from this work to the results reported by the ELM Survey, we demonstrated the potential of LAMOST spectra in probing into the nature of ELM WDs. Based on the atmospheric parameters and Gaia EDR3 data, we identified 21 new high-probability ELM WDs with masses M ≤ 0.3M☉ and parallax estimates that agree to within a factor of 3. Two of them, J0338+4134 and J1129+4715, show significant radial velocity variability and are very likely to be binary systems containing at least one ELM WD.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): White dwarf stars - Compact objects

VizieR on-line data: <Available at CDS (J/ApJ/936/5): table1.dat table2.dat table3.dat>

Simbad objects: 146

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Number of rows : 146
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 LAMOST J000053.36+465336.8 WD* 00 00 53.3680351056 +46 53 37.074594192           D 5 0
2 LAMOST J000848.69+503949.0 WD* 00 08 48.7038534528 +50 39 49.121240508           DB 6 0
3 LAMOST J001232.52+274709.5 WD* 00 12 32.4803324472 +27 47 09.447945936           DA 5 0
4 LAMOST J001954.03+510505.6 HS* 00 19 54.0222183744 +51 05 05.628736716           sdB/sdO 8 0
5 LAMOST J002606.79+443318.2 HS* 00 26 06.7996634880 +44 33 18.299894040           sdOB 11 0
6 GALEX J004327.7+285049 WD* 00 43 27.7790750160 +28 50 48.959251512           DA 5 0
7 PG 0042+211 HS* 00 45 11.1754413648 +21 21 07.853809860   15.50 15.81 16.30   sdOA 11 0
8 LAMOST J004628.31+343319.90 WD* 00 46 28.2364491216 +34 33 20.558080224           DA3 11 0
9 2MASS J00543988+3750373 WD* 00 54 39.8700156768 +37 50 37.158590040           D 7 0
10 LAMOST J005837.09+445430.8 WD* 00 58 37.0899687288 +44 54 31.056369840           sdA 6 0
11 LAMOST J010128.68+040158.9 WD* 01 01 28.6957722216 +04 01 58.934997552           D 4 0
12 GALEX J010940.4+524908 HS* 01 09 40.4576336256 +52 49 08.676455916           sdOB 10 0
13 LAMOST J021159.79+465936.1 WD* 02 11 59.8054494984 +46 59 36.300707088           D 4 0
14 UCAC4 460-002991 SB* 02 15 06.2761983672 +01 55 04.157655276   14.421 14.210 14.559   A2.5 8 0
15 GALEX J022808.9+191510 WD* 02 28 08.9589742896 +19 15 09.541192860           DB: 5 0
16 GALEX J023007.2+292255 HS* 02 30 07.2612256896 +29 22 56.250124896           sdB/sdO 7 0
17 GALEX J023824.1+412320 WD* 02 38 24.0513457440 +41 23 20.500921104           D 4 0
18 LAMOST J025404.17+475009.4 WD* 02 54 04.1937259104 +47 50 09.861594756           DA: 5 0
19 ATO J047.0757+51.6698 WD* 03 08 18.1872977040 +51 40 11.623716948   16.70 15.54 15.32   DAZ 13 0
20 GALEX J031220.5+455123 WD* 03 12 20.5356685272 +45 51 23.425986960           DA 5 0
21 SDSS J031310.67+413120.1 WD* 03 13 10.6591806312 +41 31 20.262328788           DA 11 0
22 KPD 0311+4801 PN 03 14 45.9179057208 +48 12 05.898601584 13.03 14.209 14.449 14.782   DA.5 27 0
23 HE 0315-0118 WD* 03 18 13.2653956608 -01 07 11.741744712   14.29 15.1 14.8   DA 33 0
24 GALEX J033847.1+413424 HS* 03 38 47.0760002664 +41 34 24.192791220   15.08 15.11 15.09   sdB 13 0
25 LAMOST J034145.50+493839.5 WD* 03 41 45.5047802880 +49 38 39.873064596           DA 5 0
26 UCAC4 577-008774 HS* 03 44 22.2638324184 +25 14 53.376834588   15.680 15.658 15.937   sdB/sdO 12 1
27 GALEX J034629.0+155535 WD* 03 46 29.0561108376 +15 55 35.386525524           DA: 6 0
28 KUV 03467-0108 WD* 03 49 17.4089215872 -00 59 19.230310320   18.0       PG1159 27 1
29 LAMOST J035448.22+351521.0 HS* 03 54 48.2165517048 +35 15 21.140021016           sdO 11 0
30 LAMOST J040403.73+291703.8 WD* 04 04 03.7066948920 +29 17 04.271893548           DA 9 0
31 UCAC4 491-006416 HS* 04 04 18.3900531447 +08 00 02.897983838   16.206 15.807 16.130   sdB/sdO 7 0
32 GALEX J041403.1-024032 WD* 04 14 03.1462425960 -02 40 33.975380604           DA 5 0
33 PM J04263+4820 WD* 04 26 23.5939601232 +48 20 09.855124188           DA+DC 11 0
34 LAMOST J042700.08-025301.6 HS* 04 27 00.0752707272 -02 53 01.606463916           sdB/sdO 10 0
35 GALEX J043129.1+553831 WD* 04 31 29.1613614552 +55 38 32.240514804           A2V 6 0
36 GALEX J043859.9+395404 WD* 04 39 00.0147445176 +39 54 04.630484844           DA 5 0
37 LAMOST J044231.82+411112.5 WD* 04 42 31.7599282152 +41 11 13.202506464           O 6 0
38 LAMOST J044302.66+054117.0 WD* 04 43 02.6620878696 +05 41 17.171276168           D 3 0
39 LAMOST J045727.87+231448.4 WD* 04 57 27.8604407880 +23 14 50.791983468           DA 7 0
40 GALEX J045855.6+174049 WD* 04 58 55.6928184072 +17 40 49.132769736           DA 6 0
41 FBS 0456-025 HS* 04 59 20.2998289776 -02 28 06.496248720   13.89 14.7     sdB 13 0
42 GALEX J050758.1+301323 WD* 05 07 58.1596078344 +30 13 23.288497608           DA 6 0
43 LAMOST J051135.26+391706.5 HS* 05 11 35.2657785984 +39 17 06.453433464           sdB/sdO 6 0
44 GALEX J051143.8+140810 WD* 05 11 43.8288484320 +14 08 09.847277700           DB 5 0
45 LAMOST J051428.84+113717.1 WD* 05 14 28.8447719223 +11 37 17.146579790           D 3 0
46 GALEX J051717.3+250933 WD* 05 17 17.3968990464 +25 09 32.628660264           DB 5 0
47 LAMOST J052452.29+183233.2 WD* 05 24 52.2904830456 +18 32 33.316837188           DB: 5 0
48 LAMOST J052621.66+045606.2 WD* 05 26 21.6626790960 +04 56 06.303779700           DA 5 0
49 SDSS J052933.85+040720.0 HS* 05 29 33.8535067728 +04 07 20.116466652           sdOBHe 13 0
50 UCAC4 531-014977 HS* 05 33 21.1594515072 +16 06 47.782056600   15.40 15.27 15.45   sdB 10 0
51 PSO J083.3481+21.4390 HS* 05 33 23.5561245480 +21 26 20.464082124           sdO 9 0
52 LAMOST J053959.13+663043.4 WD* 05 39 59.1308294016 +66 30 43.637915664           D 5 0
53 LAMOST J054335.91+250410.8 WD* 05 43 35.9093927280 +25 04 10.989526764           DA 6 0
54 GALEX J054706.1+400822 HS* 05 47 06.2294168448 +40 08 22.605182448   15.84 15.76 15.85   sdOB 11 0
55 LAMOST J054711.59+170919.5 HS* 05 47 11.5946411424 +17 09 19.598439816   16.48 16.50 16.43   sdBHe 14 1
56 DENIS J054716.3-002432 WD* 05 47 16.3102409832 -00 24 32.851786896         17.462 DA 6 0
57 GALEX J054940.1+522227 WD* 05 49 40.1333905920 +52 22 27.466038192           DB 5 0
58 2MASS J05563774+0306071 WD* 05 56 37.7705345520 +03 06 06.760469268           D 7 0
59 LAMOST J060905.82+092217.9 WD* 06 09 05.8361683776 +09 22 17.906223612           D 4 0
60 LAMOST J060956.76+441829.3 HS* 06 09 56.7637953600 +44 18 29.459760300           sdB/sdO 10 0
61 LAMOST J061604.94+022013.3 WD* 06 16 04.9430042256 +02 20 13.332525756           DB 5 0
62 2MASS J06183828+2456239 HS* 06 18 38.2715188704 +24 56 23.896850712           sdB/sdO 8 0
63 LAMOST J062830.43+112018.4 HS* 06 28 30.4429266792 +11 20 18.417026976           sdB/sdO 7 0
64 GALEX J063342.0+372042 WD* 06 33 42.0345853440 +37 20 41.365651128           D 5 0
65 SDSS J063449.92+380352.2 WD* 06 34 49.9364443272 +38 03 52.451014176           DA 15 0
66 GALEX J063714.1+422254 HS* 06 37 14.1540610488 +42 22 54.156598104           sdOB 11 0
67 LAMOST J064532.02+114003.1 HS* 06 45 32.0319043440 +11 40 03.201804984           sdB/sdO 6 0
68 LAMOST J064734.86+135011.3 HS* 06 47 34.8610141128 +13 50 11.391605880           sdB 11 0
69 LAMOST J064905.23+345736.0 WD* 06 49 05.2336724664 +34 57 36.149084172           D 4 0
70 LAMOST J070102.95+094135.6 HS* 07 01 02.9558118192 +09 41 35.657252124           sdB 11 0
71 2MASS J07071858+1400581 HS* 07 07 18.6029250144 +14 00 58.338989172           sdOB 14 0
72 LAMOST J071051.21+051445.0 HS* 07 10 51.2203754472 +05 14 44.984342040           sdB/sdO 7 0
73 GALEX J071856.2+102637 HS* 07 18 56.2491325608 +10 26 38.354197200   15.692 15.796     sdOBHe 13 0
74 LAMOST J072327.07+114047.8 HS* 07 23 27.0738985008 +11 40 47.932779900           sdB/sdO 7 0
75 GALEX J073220.1+270408 HS* 07 32 20.1426860928 +27 04 08.603902308   16.5   16.5   sdO 21 1
76 GALEX J073702.8+473749 WD* 07 37 02.8988185320 +47 37 49.168066584           DA 14 0
77 LAMOST J073717.47+025954.8 WD* 07 37 17.4752911456 +02 59 54.884588327           D 2 0
78 GALEX J074511.5+194925 WD* 07 45 11.5697202720 +19 49 26.598323604   16.5   15.55   DA 17 0
79 SDSS J074525.09+254706.0 WD* 07 45 25.0888121712 +25 47 06.034803252           DA 6 0
80 SDSS J074544.32+185849.5 WD* 07 45 44.3137998624 +18 58 49.572155352           DA 7 0
81 GALEX J075519.4+480033 WD* 07 55 19.4755767912 +48 00 34.060709988           DA 29 0
82 GALEX J080242.9+175001 WD* 08 02 42.9728143560 +17 50 01.120266780           DA3 7 0
83 GALEX J080333.8+423504 WD* 08 03 33.8836535760 +42 35 04.737749208   17.6   17.5   DA 17 0
84 GALEX J080405.1+394436 WD* 08 04 05.1375465192 +39 44 36.105911916           DA 20 0
85 GALEX J080739.2+132111 WD* 08 07 39.3128189472 +13 21 10.648858896           DA 16 0
86 GALEX J083353.7+385218 WD* 08 33 53.7198703416 +38 52 18.896455128           DA+DB/DC 15 0
87 PG 0833+211 HS* 08 36 19.6983753096 +20 57 47.477242872   16.7   16.7   sdB 19 0
88 GALEX J090525.5+394339 WD* 09 05 25.4880317232 +39 43 39.203059476           DA 18 0
89 SDSS J091925.45+273300.8 WD* 09 19 25.4714337072 +27 33 01.122780240           DA 8 0
90 CBS 6 WD* 09 23 45.6023056776 +30 28 05.083240368   16       DA2.7 55 0
91 LAMOST J092810.84+301601.5 WD* 09 28 10.848 +30 16 01.57           D 1 0
92 US 738 ** 09 35 06.9270091560 +44 11 06.938394720   17.7   17.8   DA+M 44 0
93 Ton 1080 WD* 09 37 08.6067973416 +33 34 04.681249860   16.5 16.35     DA2.0 32 0
94 SDSS J093823.86+225549.5 WD* 09 38 23.8933887744 +22 55 49.810654380           DA 7 0
95 Ton 24 HS* 09 47 29.3536481784 +27 16 27.138053064   15.6 16.706 16.6   sdB 24 0
96 GALEX J095019.7-010423 WD* 09 50 19.7197671480 -01 04 23.390421312           DAO 15 0
97 GALEX J100559.1+224932 WD* 10 05 59.1154061304 +22 49 32.311886664           DA+DA 59 0
98 GALEX J100955.3+000944 WD* 10 09 55.3733163408 +00 09 43.959967056   17.83       DA 20 0
99 GALEX J101342.0+260619 HS* 10 13 42.1212053064 +26 06 19.951113456     16.638     sdO 18 0
100 GALEX J101532.1+042508 WD* 10 15 32.1100402128 +04 25 07.587501060           DA 14 0
101 GALEX J104709.0+345347 WD* 10 47 09.1863202224 +34 53 46.647367908   16.3   16.2   DA 24 0
102 GALEX J105315.6+315640 WD* 10 53 15.6285195984 +31 56 40.729451028           DA 12 0
103 Ton 1323 WD* 11 04 32.5723321080 +36 10 48.873021996   14.76 14.49     DA3.7 75 0
104 HS 1102+0934 WD* 11 04 36.7495773072 +09 18 22.842050364   16.9   16.5   DA 31 0
105 GALEX J112014.8+155956 WD* 11 20 14.8300805112 +15 59 55.438077768           B9 6 0
106 GALEX J112914.1+471501 SB* 11 29 14.1673466088 +47 15 01.766452572   16.164 16.078     sdA 12 0
107 2QZ J113320.2-023440 WD* 11 33 20.2543551504 -02 34 39.374463864   18.33       DA 19 0
108 GD 142 WD* 11 44 46.1597497728 +36 41 51.128704392   15.21 15.09 15.35   DA3.4 23 0
109 SDSS J115023.09+025052.4 WD* 11 50 23.1047098464 +02 50 52.435849128   16.5   16.9   DA 9 0
110 A3 476 WD* 12 35 49.8885635880 +15 43 19.362228924   16.9       DA 22 0
111 Ton 107 HS* 12 42 01.7342122248 +43 40 23.421902196   17.0 16.819 17.0   sdBC0.2VIIHe27 30 0
112 LAMOST J124943.56+262604.5 WD* 12 49 43.5700515984 +26 26 04.275058272   16.1   15.9   DAZ 10 0
113 LB 28 HS* 13 04 39.5724595416 +31 29 04.914817872   16.6   17.0   sdO 30 0
114 SDSS J130521.60+385900.1 WD* 13 05 21.6160259736 +38 59 00.139858188           DAO 10 0
115 GALEX J132925.2+123025 ** 13 29 25.2310236312 +12 30 25.483122324           DA+M 25 0
116 HS 1334+0701 WD* 13 36 33.6796610256 +06 46 26.745427632   15.1   15.6   DA 22 0
117 SDSS J133725.23+395238.6 WD* 13 37 25.2232176571 +39 52 38.850680313           DA 23 0
118 PG 1339+052 HS* 13 41 31.4796026016 +04 54 46.775443860   15.91 16.15     sdO 24 1
119 UCAC4 493-060690 SB* 13 43 36.4428788184 +08 26 39.423219108   16.553 16.295     ELMD 7 0
120 PB 4130 WD* 13 53 42.3532644288 +16 56 51.749791908   16.5       DA 23 0
121 PB 4146 ** 13 55 12.343 +19 56 45.64   16.1   16.18   D 10 0
122 GALEX J143008.5+300112 WD* 14 30 08.4686079672 +30 01 11.544064536           DA 13 0
123 GALEX J144957.2+171729 WD* 14 49 57.1597319808 +17 17 29.345441928   17.9   18.1   DA 11 0
124 LSPM J1511+4048 WD* 15 11 09.8959755024 +40 48 01.186094160   16.0   15.6   DA 30 0
125 GD 347 WD* 15 36 15.8308962120 +50 13 50.984197608   15.97   15.6   DA5.6 60 0
126 GALEX J155708.5+282336 WD* 15 57 08.4830623752 +28 23 36.057237324           DA 26 0
127 GALEX J162624.9+162202 HS* 16 26 24.9185695800 +16 22 01.470885996           sdB 12 0
128 GALEX J180522.2+151201 HS* 18 05 22.2753565200 +15 12 01.203819984           sdB 11 0
129 LAMOST J181532.90+064224.3 HS* 18 15 32.9046628752 +06 42 24.496977564           sdB 5 0
130 LAMOST J182547.51+063337.2 WD* 18 25 47.5172480016 +06 33 37.376803584           DA 5 0
131 LAMOST J182718.86+175815.0 WD* 18 27 18.8539257816 +17 58 15.005394480           DA 5 0
132 LAMOST J190843.03+261722.0 WD* 19 08 43.0294728720 +26 17 22.025322132           DA 6 0
133 2MASS J19375685+3606258 HS* 19 37 56.8470201840 +36 06 25.871921064           sdB/sdO 8 0
134 LAMOST J211612.48+374613.7 WD* 21 16 12.4933529784 +37 46 13.840103100           D 3 0
135 GALEX J214728.5+165124 WD* 21 47 28.5732511896 +16 51 24.028519932           DA: 5 0
136 GALEX J214944.8+343243 WD* 21 49 44.7679161840 +34 32 43.987020864           DA 5 0
137 LAMOST J215151.11+153653.2 WD* 21 51 51.1073682072 +15 36 53.568448596           DO 5 0
138 GALEX J221501.3+051833 WD* 22 15 01.3832080104 +05 18 33.299141508           DA 13 0
139 SDSS J224021.22+120533.1 HS* 22 40 21.2239350936 +12 05 33.298053972           sdB 11 0
140 LAMOST J225135.78+330050.2 WD* 22 51 35.8029348696 +33 00 50.462147556           D 4 0
141 GALEX J225704.0+121647 WD* 22 57 04.0123704840 +12 16 46.834780368           DA 6 0
142 LAMOST J230637.86+022429.7 WD* 23 06 37.8651699168 +02 24 29.649497904           D 3 0
143 GALEX J232337.1+183504 HS* 23 23 37.1154177096 +18 35 04.500331728           sdB 14 0
144 LAMOST J232349.89+451654.1 WD* 23 23 49.8899469912 +45 16 54.143692320           D 6 0
145 LAMOST J233132.87+422828.3 WD* 23 31 32.8686128952 +42 28 28.332131556           DA 6 0
146 LAMOST J233256.14+505659.8 WD* 23 32 56.1320985755 +50 57 00.061050706           D 2 0

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