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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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 103 55 Companion candidates
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
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 H_2_O 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)
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) [MLT05] = Massarotti et al. (2005, Cat. J/AJ/129/2294>) [RZ93] = Reipurth and Zinnecker (1993A&A...278...81R) [2M] = 2MASS, Cat. II/246
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 18-Nov-2008
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