2001A&A...375..130C


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.16CEST10:11:08

2001A&A...375..130C - Astronomy and Astrophysics, volume 375, 130-144 (2001/8-3)

New low-mass pre-main sequence spectroscopic binaries in Orion.

COVINO E., MELO C., ALCALA J.M., TORRES G., FERNANDEZ M., FRASCA A. and PALADINO R.

Abstract (from CDS):

We report the results of a high-resolution spectroscopic monitoring campaign on low-mass pre-main sequence spectroscopic binaries, discovered recently in the general direction of the Orion star-forming region, based on ROSAT all-sky survey X-ray observations. Also included in the present study are two binaries recognized in the course of optical follow-up observations of X-ray sources in a selected sky strip crossing the Orion SFR perpendicular to the galactic plane. Orbital elements for the six double-lined spectroscopic binaries are derived from the analysis of the radial velocities of the components. The orbital periods span from 3 to 47 days. In addition, through a matching of the binary composite spectrum with synthetic binary spectra, we estimate spectral types and luminosity ratios for the components and derive lithium abundances for individual binary components. Using the estimated stellar parameters combined with kinematical information and lithium abundance determinations, we examine the evolutionary status of the objects. We then use the minimum masses derived from the solution of the spectroscopic orbits for the systems of confirmed PMS nature to make comparisons with current theoretical pre-main sequence evolutionary tracks, and attempt to set constraints on some of the most frequently used models.

Abstract Copyright:

Journal keyword(s): stars: binaries: spectroscopic - stars: pre-main sequence - stars: low-mass, brown dwarfs - stars: fundamental parameters

VizieR on-line data: <Available at CDS (J/A+A/375/130): stars.dat table2.dat table3.dat>

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 V* LO Eri RS* 03 50 30.8228458244 -13 55 29.757023428   11.65 10.759   9.816 K0-K1+K1-K2 21 0
2 V* MM Eri RS* 04 40 59.794752 -08 40 02.45424   10.78 10.15 10.07   G7 12 0
3 V* V1642 Ori TT* 05 29 20.633592 +00 41 27.99600   13.31 12.31 12.03   K2 45 0
4 V* V1878 Ori Or* 05 30 42.6347868035 -04 35 01.899769035   12.60 11.521   10.221 K3e 24 0
5 V* V1882 Ori SB* 05 32 02.2843566911 -07 31 55.694241873     12.57 12.41   K4 13 0
6 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 466 0
7 M 42 HII 05 35 17.3 -05 23 28           ~ 3657 0
8 NAME Ori A MoC 05 38 -07.1           ~ 2610 0
9 V* V2758 Ori Or* 05 41 23.9429612738 -03 24 46.017364551   12.49 11.37     K1 15 0
10 NAME Flame Nebula HII 05 41 42.7 -01 54 44           ~ 690 1
11 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1126 0
12 IC 2602 OpC 10 42 58 -64 24.0           ~ 538 0
13 Ass Ori OB 1a As* ~ ~           ~ 185 0

    Equat.    Gal    SGal    Ecl

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2019.10.16-10:11:08

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