2020AJ....160...30S

Query : 2020AJ....160...30S

2020AJ....160...30S - Astron. J., 160, 30-30 (2020/July-0)

Pleiades or not? Resolving the status of the lithium-rich M dwarfs HHJ 339 and HHJ 430.

STAUFFER J., BARRADO D., DAVID T., REBULL L.M., HILLENBRAND L.A., MAMAJEK E.E., OPPENHEIMER R., AIGRAIN S., BOUY H. and LILLO-BOX J.

Abstract (from CDS):

Oppenheimer et al. discovered two M5 dwarfs in the Pleiades with nearly primordial lithium. These stars are not low enough in mass to represent the leading edge of the lithium depletion boundary at Pleiades age (∼125 Myr). A possible explanation for the enhanced lithium in these stars is that they are actually not members of the Pleiades but instead are members of a younger moving group seen in projection toward the Pleiades. We have used data from Gaia DR2 to confirm that these two stars, HHJ 339 and HHJ 430, are indeed not members of the Pleiades. Based on their space motions, parallaxes, and positions in a Gaia-based color-magnitude diagram, it is probable that these two stars are about 40 parsecs foreground to the Pleiades and have ages of ∼25 Myr. Kinematically they are best matched to the 32 Ori moving group.

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

Journal keyword(s): Moving clusters - Star clusters - Open star clusters

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 NAME THA MGr 00 00 -62.0           ~ 540 0
2 Cl Blanco 1 OpC 00 03 04.1 -29 48 55           ~ 380 0
3 * alf Per V* 03 24 19.3700924 +49 51 40.245455 2.64 2.27 1.79     F5Ib 870 1
4 * 16 Tau V* 03 44 48.2149362048 +24 17 22.083331452 5.09 5.42 5.46 5.42 5.47 B7V 272 0
5 * 17 Tau Be* 03 44 52.5370897890 +24 06 48.016260072 3.19 3.59 3.70 3.71 3.80 B6IIIe 415 1
6 * q Tau SB* 03 45 12.4999931614 +24 28 02.185543730 3.73 4.19 4.30 4.30 4.40 B6IV 288 0
7 * 20 Tau PM* 03 45 49.6081548365 +24 22 03.877565838 3.40 3.80 3.87 3.85 3.90 B7III 451 1
8 * 21 Tau PM* 03 45 54.4764507648 +24 33 16.235698248 5.49 5.72 5.76 5.71 5.74 B8V 234 0
9 * 23 Tau Be* 03 46 19.5858871361 +23 56 54.092177220 3.70 4.12 4.18   4.16 B6IV(e) 446 2
10 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
11 * eta Tau Be* 03 47 29.0765529 +24 06 18.488347 2.44 2.78 2.87 2.84 2.88 B7III 557 1
12 V* V348 Tau LM* 03 48 26.5845315120 +23 11 29.802932952   19.098 17.450   14.123 M4.7 46 0
13 * 28 Tau Be* 03 49 11.2165977912 +24 08 12.156712008 4.73 5.01 5.09   5.08 B8Vne 494 0
14 V* V692 Tau LM* 03 56 30.4194620928 +24 17 18.653933976       15.92   M: 32 0
15 NAME 93 Tau Group ** 04 05 58.22400 +20 10 47.1830           ~ 5 0
16 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
17 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
18 NAME 32 Ori group OpC 05 27 11 +06 16.0           ~ 84 0
19 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
20 M 36 OpC 05 36 19.8 +34 08 02   6.09 6.0     ~ 206 2
21 NGC 2516 OpC 07 58 00.5 -60 46 36           ~ 793 0
22 NGC 2547 OpC 08 10 01.5 -49 12 08           ~ 445 0
23 IC 2391 OpC 08 41 17.5 -53 03 00           ~ 871 0
24 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 894 0
25 NAME Upper Sco Association As* 16 12 -23.4           ~ 1586 1
26 ATO J245.8522-17.2909 Or* 16 23 24.5435163792 -17 17 27.143235744           M2.5e 24 0
27 IC 4665 OpC 17 46 04.0 +05 36 54           ~ 407 0
28 NAME ATLAS Stream St* ~ ~           ~ 44 0

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