2001A&A...366..965G


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.30CET03:29:27

2001A&A...366..965G - Astronomy and Astrophysics, volume 366, 965-971 (2001/2-2)

RX J1603.8-3938 - a surprising pre-main sequence spectroscopic binary.

GUENTHER E.W., TORRES G., STOUT-BATALHA N.M., JOERGENS V., NEUHAEUSER R., VIJAPURKAR J. and MUNDT R.

Abstract (from CDS):

We have determined the orbit of the double-lined spectroscopic binary RX J1603.8-3938. The binary consists of two weak-line T Tauri stars, both of which have a spectral type between K3 and K4. The period of the circular orbit is 7.55626±0.00021 days and the mass ratio 0.9266±0.0063. To our knowledge RX J1603.8-3938 is thus the pre-main sequence binary with the longest period that has a circular orbit. Despite the fact that the masses and spectral types of the two components are almost identical, the photospheric lines are much stronger in one component than in the other. In the wavelength region between 5500 and 7800 Å we find that the ratio of the equivalent widths of the primary to the secondary is 0.60±0.03. This ratio is constant in time, and is the same for all photospheric lines. Since the components are weak-line T Tauri stars, the effect cannot be explained by any kind of veiling. We are led to the conclusion that the secondary is 0.55±0.05mag fainter than the primary. It thus turns out that evolutionary tracks of pre-main sequence single stars are unable to explain the position of this system in the HR diagram.

Abstract Copyright:

Journal keyword(s): stars: binaries: spectroscopic - stars: formation - stars: late-type - stars: pre-main sequence

Simbad objects: 7

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Number of rows : 7

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 HD 283447 Or* 04 14 12.9232870093 +28 12 12.378540314 13.17 12.07 10.68 9.45 8.67 K3Ve 383 0
2 V* V1321 Ori Or* 05 35 04.3009468008 -05 08 12.736574621   11.94 10.538   9.117 K0III 95 0
3 IC 2391 OpC 08 40 32 -53 02.0           ~ 723 0
4 IC 2602 OpC 10 42 58 -64 24.0           ~ 557 0
5 * 37 Lib PM* 15 34 10.7020905 -10 03 52.306353 6.48 5.63 4.62 3.85 3.33 K1III-IV 161 0
6 CD-39 10292 TT* 16 03 52.4932393087 -39 39 01.287069408 12.83 12.00 11.01 10.38 9.79 K3V 23 0
7 IC 4665 OpC 17 46 18 +05 43.0           ~ 317 0

    Equat.    Gal    SGal    Ecl

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2020.10.30-03:29:27

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