2020AJ....160..187C

Query : 2020AJ....160..187C

2020AJ....160..187C - Astron. J., 160, 187-187 (2020/October-0)

A KELT-TESS eclipsing binary in a young triple system associated with the local "stellar string" Theia 301.

CUNNINGHAM J.-M.C., FELIZ D.L., DIXON D.M., PEPPER J., STASSUN K.G., SIVERD R.J., ZHOU G., BAYLISS D., TAN T.-G., CARGILE P., JAMES D., KUHN R.B. and KOUNKEL M.

Abstract (from CDS):

HD 54236 is a nearby, wide common-proper-motion visual pair that has been previously identified as likely being very young by virtue of strong X-ray emission and lithium absorption. Here, we report the discovery that the brighter member of the wide pair, HD 54236A, is itself an eclipsing binary (EB), comprising two near-equal solar-mass stars on a 2.4 days orbit. It represents a potentially valuable opportunity to expand the number of benchmark-grade EBs at young stellar ages. Using new observations of Ca II H and K emission and lithium absorption in the wide K-dwarf companion, HD 54236B, we obtain a robust age estimate of 225 ± 50 Myr for the system. This age estimate and Gaia proper motions show HD 54236 is associated with Theia 301, a newly discovered local "stellar string," which itself may be related to the AB Dor moving group through shared stellar members. Applying this age estimate to AB Dor itself alleviates reported tension between observation and theory that arises for the luminosity of AB Dor C when younger age estimates are used.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Eclipsing binary stars - Fundamental parameters of stars - Stellar associations - Low mass stars

Simbad objects: 28

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Number of rows : 28
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 Cl Blanco 1 OpC 00 03 04.1 -29 48 55           ~ 380 0
2 NGC 752 OpC 01 56 53.7 +37 45 06           ~ 712 0
3 NGC 1039 OpC 02 42 09.1 +42 44 02           ~ 467 0
4 Cl Melotte 20 MGr 03 26 50.6 +48 51 48           ~ 928 0
5 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
6 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
7 NAME 32 Ori group OpC 05 27 11 +06 16.0           ~ 84 0
8 V* AB Dor C LM* 05 28 44.83 -65 26 54.9           M8: 71 0
9 V* V1174 Ori Or* 05 34 27.8529220296 -05 41 37.875014808 16.506 15.070 14.305   12.367 K4.5e 59 0
10 NGC 2168 OpC 06 09 07.5 +24 20 15           ~ 604 0
11 NAME AB Dor Moving Group MGr 06 38 53.4 -42 50 04           ~ 540 0
12 TIC 767642477 * 07 05 24.5274414408 -48 51 14.361343920           ~ 1 0
13 HD 54236 SB* 07 05 35.0493298896 -48 50 24.254530872   9.859 9.263 9.64   F8V 18 0
14 HD 54236B * 07 05 35.1705195912 -48 50 30.804147636       12.68   K7V 2 0
15 TIC 767642478 * 07 05 37.0229766984 -48 50 17.657650320           ~ 1 0
16 HD 54262 PM* 07 05 40.5086729640 -48 50 20.137088040   10.51 9.59     K0/2(IV) 9 0
17 NGC 2516 OpC 07 58 00.5 -60 46 36           ~ 793 0
18 NGC 2547 OpC 08 10 01.5 -49 12 08           ~ 445 0
19 IC 2391 OpC 08 41 17.5 -53 03 00           ~ 871 0
20 IC 2602 OpC 10 42 55.9 -64 25 22           ~ 735 0
21 Cl Melotte 111 OpC 12 11 54.9 +25 16 36           ~ 520 0
22 NAME Ursa Major Moving Group MGr 12 32 +57.0           ~ 467 1
23 HD 120223 * 13 49 06.5548938600 -43 44 00.219789924   9.93 8.96     G8IV 19 0
24 HD 126053 PM* 14 23 15.2847745835 +01 14 29.641269692 6.98 6.90 6.27 5.71 5.39 G1.5V 442 0
25 * kap Ara * 17 26 00.0431284872 -50 38 00.623818572   6.236 5.193     G8III 87 0
26 NGC 6457 rG 17 42 52.8273859024 +66 28 33.756827959   14.7       ~ 23 1
27 * del Sgr * 18 20 59.6428936493 -29 49 41.168145329   4.069 2.668     K2.5IIIaCN0.5 184 0
28 NGC 6633 OpC 18 27 30.2 +06 38 21           ~ 423 0

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