J/PASJ/60/209 Faint companions around YSOs in TMC (Itoh+, 2008)
Near-infrared spectroscopy of faint companions around young stellar
objects associated with the Taurus molecular cloud.
Itoh Y., Tamura M., Hayashi M., Oasa Y., Hayashi S.S., Fukagawa M.,
Kudo T., Mayama S., Ishii M., Pyo T.-S., Yamashita T., Morino J.
<Publ. Astron. Soc. Jap., 60, 209-218 (2008)>
=2008PASJ...60..209I 2008PASJ...60..209I
ADC_Keywords: Molecular clouds ; YSOs ; Infrared sources ;
Binaries, spectroscopic
Keywords: planetary systems: formation - techniques: high angular resolution
Abstract:
We have conducted near-infrared spectroscopy of 26 faint objects
around young stellar objects in the Taurus molecular cloud. These
objects were detected during a course of near-infrared coronagraphic
searches for companions around 72 young stellar objects with the
Subaru Telescope and the near-infrared coronagraph CIAO (coronagraphic
imager with adaptive optics). A comparison of the Subaru and HST
archive images revealed that three central stars and faint companions
share common proper motions, suggesting that they are physically
associated with each other. None of the 26 sources show deep water
absorption bands at near-infrared, except for DH Tau B. This result
indicates that all of them, but DH Tau B, have a high photospheric
temperature or a large amount of excess from circumstellar materials.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 103 55 Companion candidates
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Central star name
17- 19 A3 --- m_Name Companion designation (within the name) (1)
21- 25 F5.2 mag Hmag H (1.6µm) magnitude
27- 31 F5.2 arcsec SepC Separation of candidate companion at CIAO
33- 38 F6.2 deg PAC Position angle of companion at CIAO
40- 44 F5.2 arcsec SepH ? Separation measured at HST
46- 51 F6.2 deg PAH ? Position angle measured at HST
53- 56 F4.2 yr DEp ? Time interval between HST and CIAO observations
58- 61 F4.1 mas/yr pmRA ? Proper motion of central star along RA
63- 67 F5.1 mas/yr pmDE ? Proper motion of central star along Declination
69- 72 F4.2 --- Q ? Reddening-independent index of the H2O band
strength (2)
74- 76 F3.1 0.1nm EWBrg ? Brγ(2170nm) line equivalent width in Å
77 A1 --- n_EWBrg [c] c for continuum
79-103 A25 --- Com Comments (3)
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Note (1): Companion candidates identified as [ITH2008] Name-m_Name in Simbad.
Note (2): Q = (F1/F2)(F3/F2)1.41 where F1, F2 and F3 are the flux
densities in the ranges of 2.07-2.13um, 2.267-2.285um, and
2.40-2.45um, respectively.
Note (3): References are as follows:
[L93] = Leinert et al. (1993A&A...278..129L 1993A&A...278..129L)
[MLT05] = Massarotti et al. (2005, Cat. J/AJ/129/2294>)
[RZ93] = Reipurth and Zinnecker (1993A&A...278...81R 1993A&A...278...81R)
[2M] = 2MASS, Cat. II/246
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 18-Nov-2008