2001A&A...379L...9J


Query : 2001A&A...379L...9J

2001A&A...379L...9J - Astronomy and Astrophysics, volume 379, L9-12 (2001/11-3)

UVES spectra of young brown dwarfs in Cha I: Radial and rotational velocities.

JOERGENS V. and GUENTHER E.

Abstract (from CDS):

Based on high-resolution UVES spectra we found that the radial velocity (RV) dispersion of nine of twelve known young bona fide and candidate brown dwarfs in the Cha I dark cloud is 2.0km/s, i.e. significantly smaller than the RV dispersion of T Tauri stars in Cha I (3.6km/s) and only slightly larger than the dispersion of the surrounding molecular gas (1.2km/s) (Mizuno et al., 1999PASJ...51..859M). This result indicates that the majority of these brown dwarfs are not ejected with high velocity out of a dense region as proposed by some formation scenarios for brown dwarfs. The mean RV values are consistent with the objects being kinematic members of Cha I. The RV dispersion of the T Tauri stars confined to the Cha I region is based on a compilation of T Tauri stars with known RVs from the literature plus three T Tauri stars observed with UVES and unpublished RVs for nine T Tauri stars. Time-resolved spectroscopy revealed RV variations for five out of nine of the bona fide and candidate brown dwarfs in Cha I, which could be due to orbiting planets or surface features. Furthermore we derived rotational velocities vsini and the Lithium 6708Å equivalent width.

Abstract Copyright:

Journal keyword(s): stars: low-mass, brown dwarfs - stars: formation - planetary systems: formation - stars: individual: Cha Hα 1 to 12, B34, CHXR 74, Sz 23

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

CDS comments: B34 = BYB 34 and F34 = WKK F34

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 - 2023
#notes
1 V* SX Cha Or* 10 55 59.802000 -77 24 40.12524   16.01 14.57 14.23 12.35 M1.5+M3 85 0
2 V* SY Cha Or* 10 56 30.3883129248 -77 11 39.401977596         11.29 K5Ve 122 0
3 Sz 4 TT* 10 57 42.0977196408 -76 59 35.641299948   14.1 14.80   12.17 M4Ve 44 0
4 V* TW Cha Or* 10 59 01.0607352312 -77 22 40.947126636     13.40   11.68 K8Ve 127 0
5 Hen 3-545 Or* 10 59 06.9715593000 -77 01 40.309233240   12.91 11.136   9.596 K4Ve 206 0
6 V* CS Cha Or* 11 02 24.8763629208 -77 33 35.667131796   12.88 11.69   10.123 K2Ve 216 0
7 V* CT Cha Or* 11 04 09.0989256840 -76 27 19.329779664   13.44 13.00   10.89 K7Ve 125 0
8 Sz 15 Em* 11 05 41.5725072288 -77 54 44.139569976   13.6       K5.5V 16 0
9 [NC98] Cha HA 12 Em* 11 06 37.9647720216 -77 43 09.113892564     20.6   15.91 M6.5e 38 0
10 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1095 1
11 CHXR 74 TT* 11 06 57.3114166800 -77 42 10.639632780         13.66 M3Ve 44 0
12 [NC98] Cha HA 1 Y*O 11 07 16.6710048312 -77 35 53.212777692   22.8 21.0   16.38 M7.5/8e 84 0
13 [NC98] Cha HA 9 BD* 11 07 18.5760916584 -77 32 51.561674700     23.1   17.57 M5.5e 50 0
14 V* DI Cha Or* 11 07 20.7276076008 -77 38 07.308086352   12.02 10.74 10.72   G2Ve 161 0
15 V* VV Cha Or* 11 07 28.241088 -76 52 11.92620   16.00 14.72 14.48 12.19 M1.5+M3 64 0
16 CHXR 25 Y*O 11 07 33.0013716528 -77 28 27.640402860   17.57 15.99 16.00 13.16 M3.5Ve 13 0
17 CHXR 76 Or* 11 07 35.1774430800 -77 34 49.286652024   20.04 18.15   14.39 M4e 45 0
18 CHSM 10496 Em* 11 07 37.7410696536 -77 35 30.793352928   23.7 22.2   17.03 ~ 39 0
19 V* HK Cha Or* 11 07 42.3364909752 -77 33 59.394350844   21.9 19.8   15.26 ~ 78 0
20 [NC98] Cha HA 8 SB* 11 07 46.0912894776 -77 40 08.918309388   22.2 20.1   15.61 ~ 43 1
21 V* HL Cha Or* 11 07 52.2574621728 -77 36 57.037742172   21.5 19.51   15.07 ~ 47 0
22 Sz 23 Or* 11 07 58.0951794888 -77 42 41.352365124   15.8 18.04   14.63 M4Ve 63 0
23 V* VW Cha Or* 11 08 01.502064 -77 42 28.87524 13.91 14.165 12.761 12.653 10.69 K7+M0 178 0
24 CHSM 12180 Em* 11 08 18.9694304592 -77 39 17.131209948   20.5 18.52   14.50 ~ 40 0
25 2MASS J11082404-7739299 BD* 11 08 24.0583968960 -77 39 30.056968764   22.6 21.6   17.10 ~ 33 0
26 ISO-ChaI 144 Em* 11 08 24.1193575992 -77 41 47.438803392   21.3 19.18   14.85 ~ 48 0
27 CHSM 12653 Em* 11 08 29.2579779792 -77 39 19.777635504   21.9 19.9   17.59 ~ 33 0
28 V* HQ Cha Or* 11 08 39.5017287912 -77 34 16.733892756   21.7 19.75   15.06 ~ 65 0
29 [CCE98] 1-74 TT* 11 09 17.6942588064 -76 27 57.926988648   15.48 13.92   11.72 K4Ve 41 0
30 V* VZ Cha Or* 11 09 23.7739008528 -76 23 20.857480836   13.82 12.94   12.14 K7e 134 0
31 V* WY Cha Or* 11 10 07.0339153464 -76 29 37.674167388   15.29 13.87   11.62 K8Ve 82 1
32 NAME Cha T Association As* 11 10 16.7 -76 42 03           ~ 42 1
33 Glass Q Y*O 11 10 37.8987149352 -77 32 39.881630256   16.89 14.97   11.90 K5.5+K7 69 0
34 V* XX Cha Or* 11 11 39.6728641032 -76 20 15.032221548   16.67 15.28   12.56 M3Ve 105 1
35 CHX 18 X 11 11 49.8 -76 19 48           ~ 62 1
36 Sz 41 TT* 11 12 24.3973943352 -76 37 06.181395384   11.2 11.60   10.22 K7+M2.5 96 1
37 V* CV Cha Or* 11 12 27.7055693328 -76 44 22.302807396   12.02 10.98 10.51 9.76 G9Ve 187 1

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2023.01.31-12:19:19

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