2001AJ....121.3235K

Query : 2001AJ....121.3235K

2001AJ....121.3235K - Astron. J., 121, 3235-3253 (2001/June-0)

Brown dwarf companions to g-type stars. I. Gliese 417B and Gliese 584C.

KIRKPATRICK J.D., DAHN C.C., MONET D.G., REID I.N., GIZIS J.E., LIEBERT J. and BURGASSER A.J.

Abstract (from CDS):

We present astrometric and spectroscopic observations confirming that two nearby G dwarf systems (Gliese 417 =BD+36°2162 and Gliese 584AB=η CrB AB) have a widely separated, L dwarf, substellar companion. Using age estimates of the G dwarf primaries, we estimate masses for these L dwarfs from theoretical evolutionary tracks. For the L4.5 dwarf Gl 417B we estimate an age of 0.08-0.3 Gyr and a mass of 0.035±0.015 M☉. For the L8 dwarf Gl 584C we estimate an age of 1.0-2.5 Gyr and a mass of 0.060±0.015 M☉. This latter object also shows evidence of spectrum variability, which may be due to surface inhomogeneities rotating into and out of view. These new companions are also compared to six other L dwarf and T dwarf companions previously recognized. For the L dwarf companions, ages implied by the presence or absence of lithium are consistent with ages inferred from the primaries alone.

Abstract Copyright: ∼

Journal keyword(s): infrared: stars - Stars: Atmospheres - Stars: Distances - Stars: Fundamental Parameters - Stars: Low-Mass, Brown Dwarfs

Simbad objects: 34

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Number of rows : 34
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 L 362-29 BC BD* 00 04 34.8671722377 -40 44 06.463544237       19.61 16.88 L5+L5 119 0
2 NGC 188 OpC 00 47 14.8 +85 14 42           ~ 990 0
3 CD-28 595 PM* 01 54 50.2703221766 -27 28 35.739139915   12.06 11.51     ~ 138 0
4 NGC 752 OpC 01 56 53.7 +37 45 06           ~ 712 0
5 HD 16270B BD* 02 35 59.9394221640 -23 31 20.410151736           L1.5 49 0
6 BD+02 418 PM* 02 42 32.5372338864 +03 22 26.014342980   11.2   9.669   K5V 37 0
7 * gam Cet ** 02 43 18.03910 +03 14 08.9390 3.63 3.56 3.47 3.36 3.32 A2Vn+F4V 185 0
8 LP 944-20 LM* 03 39 35.2523500210 -35 25 43.641996333     18.69 16.39 13.288 M9.5Ve 308 0
9 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
10 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
11 HD 42581B BD* 06 10 34.80 -21 52 00.0           T6.5 549 0
12 HD 289002 * 06 45 13.3725491952 +02 08 14.685250596 10.06 10.62 10.44     B1 277 0
13 NGC 2632 OpC 08 39 58.4 +19 36 33           ~ 1733 0
14 G 196-3B BD* 10 04 20.6391105792 +50 22 59.378638152           L3beta 115 0
15 HD 97334B BD* 11 12 25.6353966120 +35 48 12.742807176           L4.5+L6 95 0
16 HD 97334 BY* 11 12 32.3503039560 +35 48 50.688978228   7.02 6.41     G2 306 0
17 GSC 02522-01005 * 11 12 36.5505952608 +35 47 40.702780428   14.46 13.70 13.64   ~ 5 0
18 HD 97371 PM* 11 12 44.2787534544 +35 49 48.474187896   8.228 7.205     G9 32 0
19 BD+36 2165 PM* 11 12 47.9997679646 +35 43 43.885058670 9.98 10.19 9.76 9.34 9.02 G0 143 0
20 2MASSW J1145572+231730 BD* 11 45 57.1458774144 +23 17 29.661415260           L1.5V 33 0
21 HD 105183 HS* 12 06 47.2348389600 +11 40 12.659833056   10.93 11.06     sdB8IIIHe2 132 0
22 NAME Ursa Major Moving Group MGr 12 32 +57.0           ~ 467 1
23 GD 165B BD* 14 24 39.09480 +09 17 10.4352         20.53 L4V 216 0
24 NAME Proxima Centauri PM* 14 29 42.9461331854 -62 40 46.164680672 14.21 12.95 11.13 9.45 7.41 M5.5Ve 1483 0
25 * alf Cen ** 14 39 36.50 -60 50 02.3   0.4 -0.1     G2V+K1V 1031 0
26 GJ 570 D BD* 14 57 14.96256 -21 21 47.7504           T8 242 1
27 2MASSW J1507476-162738 BD* 15 07 47.6758255542 -16 27 40.113982846     22.136 18.928 16.579 L5V 216 0
28 * eta CrB A * 15 23 12.230856 +30 17 17.56212   6.123 5.577     G2V 237 0
29 * eta CrB B * 15 23 12.270456 +30 17 18.45708   6.480 5.95     G2V 138 0
30 GSC 02563-00670 * 15 23 12.2910385632 +30 18 28.440182088   13.93 13.35 13.78   ~ 5 1
31 * eta CrB C BD* 15 23 22.63488 +30 14 56.2092           L8V 118 1
32 GSC 02563-00841 * 15 23 23.4035939208 +30 19 59.707842132     11.0 12.82   ~ 7 0
33 2MASS J16241436+0029158 BD* 16 24 14.36712 +00 29 15.8172           T6V 162 0
34 EGGR 264 WD* 23 19 35.3881861344 -17 05 28.465573380 13.279 14.132 14.111 14.07 14.049 DB3 131 0

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