J/A+A/376/982 Near-IR observations of young binaries (Woitas+, 2001)
Mass ratios of the components in T Tauri binary systems and implications
for multiple star formation
Woitas J., Leinert C., Koehler R.
<Astron. Astrophys. 376, 982 (2001)>
=2001A&A...376..982W 2001A&A...376..982W
ADC_Keywords: Stars, double and multiple ; Stars, pre-main sequence ;
Infrared sources ; Photometry
Keywords: binaries: general - stars: pre-main sequence - stars: formation -
stars: fundamental parameters - techniques: interferometric -
infrared: stars
Description:
Using near-infrared speckle interferometry we have obtained resolved
JHK-photometry for the components of 58 young binary systems.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
stars.dat 70 75 Star positions (from Simbad)
tablea1.dat 87 171 Spatially resolved observations of young T Tauri
binary systems obtained by the authors
tablea2.dat 68 144 NIR photometry for components of young binary
systems
figb1p1.ps 76 1717 *Color-magnitude diagram, part 1
figb1p2.ps 76 1700 Color-magnitude diagram, part 2
figb1p3.ps 76 1500 Color-magnitude diagram, part 3
figc1p1.ps 76 2012 *HR diagram, part 1
figc1p2.ps 76 1983 HR diagram, part 2
figc1p3.ps 76 2009 HR diagram, part 3
figc1p4.ps 76 2016 HR diagram, part 4
figc1p5.ps 76 2028 HR diagram, part 5
figc1p6.ps 76 2026 HR diagram, part 6
figc1p7.ps 76 1987 HR diagram, part 7
figc1p8.ps 76 1891 HR diagram, part 8
--------------------------------------------------------------------------------
Note on figb1p1.ps: Components of WTTS systems placed into NIR color-magnitude
diagrams together with the PMS model by D'Antona & Mazzitelli (1998,
ASP Conference Series, vol. 134, p. 442). The dashed lines denote
evolutionary tracks for masses from 0.02 to 0.9M☉, the solid lines are
isochrones for ages 7x104, 105, 2x105, 3x105, 5x105, 7x105,
106, 2x106, 3x106, 5x106, 7x106, 107, 2x107, 3x107, 5x107,
108yr (MS).
Note on figc1p1.ps: Components of T Tauri binary systems placed into the
HR diagram as described in Sect. 5. The cross gives the position of the
primary, the horizontal dashed lines give the locus for the companion and
the respective error. The PMS model from Baraffe et al. (1998,
Cat. J/A+A/337/403) is also indicated. Evolutionary tracks are plotted for
masses of 0.04, 0.06, 0.08 (bold), 0.10, 0.15, 0.20, 0.30, 0.40, 0.50, 0.60,
0.70, 0.80, 1.0 and 1.2M☉, the isochrones denote ages of 1, 2, 5, 10,
20, 50 and 90Myr.
--------------------------------------------------------------------------------
See also:
II/225 : Catalog of Infrared Observations, Edition 5 (Gezari+ 1999)
Byte-by-byte Description of file: stars.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- Name Star name
19- 20 I2 h RAh Right ascension (J2000)
22- 23 I2 min RAm Right ascension (J2000)
25- 28 F4.1 s RAs Right ascension (J2000)
30 A1 --- DE- Declination sign (J2000)
31- 32 I2 deg DEd Declination (J2000)
34- 35 I2 arcmin DEm Declination (J2000)
37- 38 I2 arcsec DEs Declination (J2000)
40- 49 A10 --- FileCMD Name of the figure containing the
color-magnitude diagram
51- 60 A10 --- FileHR Name of the figure containing the HR diagram
62- 70 A9 --- Com Comment
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- Name (most common) System name
18- 19 A2 --- m_Name Multiplicity index on Name
21 A1 --- Filt [JHK] Filter name
23- 32 A10 "DD/MM/YYYY" ObsDate Observation date
34- 38 F5.3 --- I2/I1 ? Flux ratio I(2)/I(1),
'1' denotes the brighter component in K
40- 44 F5.3 --- e_I2/I1 ? Error of Flux ratio
47- 51 F5.2 mag mag ? Magnitude of system
(primary and secondary combined)
53- 56 F4.2 mag e_mag ? Error of system magnitude
58- 62 F5.2 mag mag1 ? Magnitude of primary
64- 67 F4.2 mag e_mag1 ? Error of primary magnitude
69- 73 F5.2 mag mag2 ? Magnitude of secondary
75- 78 F4.2 mag e_mag2 ? Error of secondary magnitude
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- Name (most common) System name
19 A1 --- m_Name Designation of companion
21 A1 --- l_Jmag Limit flag on Jmag
22- 26 F5.2 mag Jmag ? J magnitude (1)
28- 31 F4.2 mag e_Jmag ? Error of J magnitude
33 A1 --- l_Hmag Limit flag on Hmag
34- 38 F5.2 mag Hmag H magnitude (1)
40- 43 F4.2 mag e_Hmag ? Error of H magnitude
45- 49 F5.2 mag Kmag K magnitude (1)
51- 54 F4.2 mag e_Kmag ? Error of K magnitude
56- 59 F4.2 --- Av ? Interstellar extinction coefficient (2)
61- 65 A5 --- SpType System spectral type (2)
67 I1 --- SFR [1/4]? Index of star forming region (3)
--------------------------------------------------------------------------------
Note (1): The values given here are the mean of all spatially resolved
photometric observations, i.e. our data from Table A1 and
measurements published by:
Chelli et al. (1995A&AS..114..135C 1995A&AS..114..135C),
Duchene (1999A&A...351..954D 1999A&A...351..954D),
Ghez et al. (1993AJ....106.2005G 1993AJ....106.2005G, 1997ApJ...481..378G 1997ApJ...481..378G, 1997ApJ...490..353G 1997ApJ...490..353G),
Haas et al. (1990A&A...230L...1H 1990A&A...230L...1H),
Hartigan et al. (1994ApJ...427..961H 1994ApJ...427..961H),
Koehler et al. (2000A&A...356..541K 2000A&A...356..541K),
Moneti & Zinnecker (1991A&A...242..428M 1991A&A...242..428M),
Richichi et al. (1999A&A...346..501R 1999A&A...346..501R),
Roddier et al. (1996ApJ...463..326R 1996ApJ...463..326R)
Simon et al. (1992ApJ...384..212S 1992ApJ...384..212S).
Note (2): The values for Av and the spectral type given for the primaries,
belong to the systems (see Sect. 2.1 for references).
Note (3): Star forming region:
1: Taurus-Auriga
2: Upper Scorpius
3: Chamaeleon I
4: Lupus
--------------------------------------------------------------------------------
Acknowledgements: Jens Woitas
(End) Patricia Bauer [CDS] 20-Aug-2001