2002A&A...384..521A


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.31CET20:13:47

2002A&A...384..521A - Astronomy and Astrophysics, volume 384, 521-531 (2002/3-3)

Characterization of low-mass pre-main sequence stars in the Southern Cross.

ALCALA J.M., COVINO E., MELO C. and STERZIK M.F.

Abstract (from CDS):

We report high-resolution spectroscopic observations, as well as high-resolution near infrared (IR) imaging of six stars previously identified in a ROSAT pointed observation in the direction of the B-type star β Cru, and classified as low-mass pre-main sequence (PMS) stars. Four of the stars are confirmed to be low-mass PMS stars, associated with the Lower Centaurus-Crux group, while the other two are unrelated to the Sco-Cen association. The confirmed PMS stars are most likely in their post-T Tauri evolutionary phase. Although future deep X-ray observations with high-resolution imagers might detect more new PMS stars, the possibility that the Crux PMS stars are part of a small aggregate, with β Crux itself approximately at the center, is rather unlikely, given the high velocity dispersion and the low spatial density of the confirmed PMS stars. Instead, these stars may be part of a moving group in a more disperse and numerous population of low-mass PMS stars, distributed in the Lower Centaurus-Crux subgroup. New PMS binaries and multiple systems were also discovered among the stars in the sample, namely a close visual pair and a hierarchical triple system in which one of the components is a double-lined spectroscopic binary (SB2). The detailed orbital solution is reported for the inner short-period (Porb=58.3days) SB2. A preliminary orbital solution for the hierarchical triple system yields a systemic orbital period of about 4.6 years, which makes this object a very suitable target for follow-up observations with the Very-Large Telescope Interferometer (VLTI) in the coming years.

Abstract Copyright:

Journal keyword(s): stars: pre-main sequence - stars: low mass, brown dwarfs - stars: binaries: general - X-rays: stars

Simbad objects: 22

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Number of rows : 22

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* V1642 Ori TT* 05 29 20.633592 +00 41 27.99600   13.31 12.31 12.03   K2 45 0
2 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 491 0
3 * sig Ori Y*O 05 38 44.7665260139 -02 36 00.284709290 2.54 3.58 3.79 3.87 4.11 O9.5V 746 0
4 BD-00 1703a * 07 24 15.3799866946 -00 32 47.839148903 11.156 11.443 11.480 11.459 11.451 A0 17 0
5 NRRF J072417.4-003306 * 07 24 17.6 -00 33 07           ~ 3 0
6 * gam02 Vel WR* 08 09 31.95013 -47 20 11.7108 0.64 1.58 1.83 1.85 2.00 WC8+O7.5III-V 848 0
7 * eta Cha * 08 41 19.5144242735 -78 57 48.102318990 5.02 5.351 5.453     B8V 214 0
8 NAME eta Cha Association MGr 08 42 06 -79 01.6           ~ 312 0
9 IC 2602 OpC 10 42 58 -64 24.0           ~ 557 0
10 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 695 0
11 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 361 1
12 [PF96] 2W * 12 46 22.68 -59 34 39.0           K0: 3 0
13 [PF96] 2E * 12 46 23.17 -59 34 38.7           G 2 0
14 [PF96] 1 * 12 46 40.93 -59 31 43.9           K 4 0
15 * bet Cru bC* 12 47 43.26877 -59 41 19.5792 0.03 1.02 1.25 1.38 1.64 B1IV 324 0
16 GSC 08659-01804 Ro* 12 48 31.5351064150 -59 44 49.279827150     11.064   9.508 K7IVe 12 1
17 [PF96] 5 * 12 48 32.3705198407 -60 02 43.933900147       12.99   K4 3 0
18 [PF96] 4 X 12 48 54.48 -59 49 48.7           ~ 2 0
19 GSC 08659-02351 * 12 49 24.3803853567 -59 13 11.275854295           K0: 5 0
20 NAME Lup Cloud SFR 16 03 -38.1           ~ 531 0
21 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1143 1
22 NAME Cen-Crux As* ~ ~           ~ 24 0

    Equat.    Gal    SGal    Ecl

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2020.10.31-20:13:47

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