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J/ApJ/704/531        The coevality of young binary systems        (Kraus+, 2009)

The coevality of young binary systems. Kraus A.L., Hillenbrand L.A. <Astrophys. J., 704, 531-547 (2009)> =2009ApJ...704..531K
ADC_Keywords: Stars, double and multiple ; Stars, ages ; Stars, masses ; Stars, pre-main sequence ; Spectral types Keywords: binaries: general - Hertzsprung-Russell (HR) diagram - open clusters and associations: individual (Taurus-Auriga) - stars: evolution - stars: fundamental parameters - stars: pre-main sequence Abstract: Multiple star systems are commonly assumed to form coevally; they thus provide the anchor for most calibrations of stellar evolutionary models. In this paper, we study the binary population of the Taurus-Auriga association, using the component positions in an HR diagram in order to quantify the frequency and degree of coevality in young binary systems. After identifying and rejecting the systems that are known to be affected by systematic errors (due to further multiplicity or obscuration by circumstellar material), we find that the relative binary ages, |Δlogτ|, have an overall dispersion σ|Δlogτ|∼0.40dex. Description: The accurate determination of stellar parameters requires spatially and/or spectrally resolved observations that are not polluted by light from companions; our sample is comprised of all known Taurus binary systems that have spectral types and flux ratios for at least two components. Most sample members have been observed with Hubble Space Telescope (HST), ground-based adaptive optics, or echelle spectrographs. We list the observed properties of our sample members in Table 1, along with the references used to infer spectral types, extinctions, and fluxes. We list our sample of apparently single stars in Table A1, including all of the references for our adopted parameters (singleness, spectral type, and extinction). We based our sample on the compilation of all Taurus members that we originally described in Kraus & Hillenbrand 2007, Cat. J/ApJ/662/413), and then we omitted all stars that did not have at least one observation at high angular resolution. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 108 73 Binary sample: observed and inferred properties table2.dat 114 73 Derived ages and masses tablea1.dat 131 121 Single-star sample: observed properties refs.dat 65 51 References
See also: J/A+A/519/A83 : T Tau stars toward the Taurus-Auriga region (Takita+ 2010) J/ApJ/703/1964 : Spectra of three nearby star-forming regions (Furlan+, 2009) J/ApJ/703/1511 : Wide binaries in Taurus and Upper Sco (Kraus+, 2009) J/ApJ/662/413 : 2MASS survey of wide multiplicity in 3 associations (Kraus+, 2007) J/AJ/132/2665 : QUEST2 BRI photometry of Taurus-Auriga PMS (Slesnick+, 2006) J/A+A/446/485 : New very low-mass members in Taurus (Guieu+, 2006) J/ApJ/647/1180 : Infrared photometry of Taurus SFR (Luhman+, 2006) J/ApJ/636/932 : Mid-infrared survey of T Tauri stars (McCabe+, 2006) J/ApJ/645/676 : Spatial distribution of brown dwarfs in Taurus (Luhman+, 2006) J/ApJ/593/1093 : IC 348 membership (Luhman+, 2003) J/ApJ/581/1194 : Taurus-Auriga PMS stars ages and Teff (Palla+, 2002) J/A+A/337/403 : Low-mass stars evolutionary models (Baraffe+ 1998) J/ApJS/101/117 : UBVRIJHKLMNQ photometry in Taurus-Auriga (Kenyon+ 1995) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name Name 14 I1 h RAh Hour of right ascension (J2000) 16- 17 I2 min RAm Minute of right ascension (J2000) 19- 23 F5.2 s RAs Second of right ascension (J2000) 25 A1 --- DE- Sign of declination (J2000) 26- 27 I2 deg DEd Degree of declination (J2000) 29- 30 I2 arcmin DEm Arcminute of declination (J2000) 32- 35 F4.1 arcsec DEs Arcsecond of declination (J2000) 37- 38 A2 --- SB Spectroscopic binary ("Sep" is null) 40- 46 F7.1 mas Sep ? Separation 48- 51 F4.1 mas e_Sep ? Uncertainty in Sep 53 A1 --- n_Flux [JHK] Band in which "Flux" is measured 55- 59 F5.2 mag Flux 2MASS magnitude in "Band" 61- 65 A5 --- SpT MK spectral type 67- 70 F4.2 --- e_SpT Spectral type uncertainty 72- 75 F4.1 mag Av Extinction 77- 80 I4 K Teff Effective temperature 82- 84 I3 K e_Teff Teff uncertainty 86- 90 F5.2 mag Mbol Bolometric magnitude 92- 93 A2 --- Warm [Y/N? ] Warm disk? 95-108 A14 --- Ref References (see refs.dat file)
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name Name 14- 18 F5.3 Msun Mass ? Adopted inferred mass from our hybrid system 20- 24 F5.3 Msun E_Mass ? Positive error in Mass 26- 30 F5.3 Msun e_Mass ? Negative error in Mass 32 A1 --- l_logtau Limit flag on logtau 33- 36 F4.2 [yr] logtau Adopted inferred age from our hybrid system 38- 41 F4.2 [yr] E_logtau ? Positive error in logtau 43- 46 F4.2 [yr] e_logtau ? Negative error in logtau 48- 52 F5.3 Msun MassL ? Mass from the Lyon models (1) 54- 58 F5.3 Msun E_MassL ? Positive error in MassL 60- 64 F5.3 Msun e_MassL ? Negative error in MassL 66 A1 --- l_logtauL Limit flag on logtauL 67- 70 F4.2 [yr] logtauL Age from the Lyon models (1) 72- 75 F4.2 [yr] E_logtauL ? Positive error in logtauL 77- 80 F4.2 [yr] e_logtauL ? Negative error in logtauL 82- 86 F5.3 Msun MassD ? Mass from the DM97 model (2) 88- 92 F5.3 Msun E_MassD ? Positive error in MassD 94- 98 F5.3 Msun e_MassD ? Negative error in MassD 100 A1 --- l_logtauD Limit flag on logtauD 101-104 F4.2 [yr] logtauD Age from the DM97 model (2) 106-109 F4.2 [yr] E_logtauD ? Positive error in logtauD 111-114 F4.2 [yr] e_logtauD ? Negative error in logtauD
Note (1): (Baraffe et al. 1998, Cat. J/A+A/337/403; Chabrier et al. 2000ApJ...542..464C) Note (2): D'Antona & Mazzitelli (1997MmSAI..68..807D)
Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 22 A22 --- Name Star name 25 I1 h RAh Hour of right ascension (J2000) 27- 28 I2 min RAm Minute of right ascension (J2000) 30- 34 F5.2 s RAs Second of right ascension (J2000) 36 A1 --- DE- Sign of declination (J2000) 37- 38 I2 deg DEd Degree of declination (J2000) 40- 41 I2 arcmin DEm Arcminute of declination (J2000) 43- 46 F4.1 arcsec DEs Arcsecond of declination (J2000) 48- 52 F5.2 mag Jmag 2MASS J-band magnitude 54- 58 A5 --- SpT MK spectral type 60- 63 F4.2 --- e_SpT SpT uncertainty 65- 68 F4.1 mag Av Extinction 70- 73 I4 K Teff Effective temperature 75- 77 I3 K e_Teff Teff uncertainty 79- 83 F5.2 mag Mbol Bolometric mass 85 A1 --- l_Mass [-] Nonphysical mass (1) 86- 90 F5.3 Msun Mass Mass 92- 96 F5.3 Msun E_Mass Positive error in Mass 98-102 F5.3 Msun e_Mass Negative error in Mass 104 A1 --- l_logtau [-] Nonphysical age (1) 105-108 F4.2 [yr] logtau Age 110-114 F5.2 [yr] E_logtau Positive error in Age 116-120 F5.2 [yr] e_logtau Negative error in Age 122-131 A10 --- Ref References (see refs.dat file)
Note (1): Some systems that sit extremely high or low in the HR diagram exceed the limits of the models and have nonphysical derived quantities (i.e., negative masses).
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Ref Reference number 4- 22 A19 --- BibCode Bibcode 24- 44 A21 --- Aut Authors 46- 65 A20 --- Comm Comment
History: From electronic version of the journal
(End) Emmanuelle Perret [CDS] 04-Nov-2011
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