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J/AJ/136/2483       Comoving group associated with HD 141569     (Aarnio+, 2008)

A survey for a coeval, comoving group associated with HD 141569. Aarnio A.N., Weinberger A.J., Stassun K.G., Mamajek E.E., James D.J. <Astron. J., 136, 2483-2492 (2008)> =2008AJ....136.2483A
ADC_Keywords: Clusters, open ; Associations, stellar ; Photometry, infrared ; Proper motions ; Parallaxes, trigonometric ; Equivalent widths Keywords: open clusters and associations: individual (HD 141569) - stars: evolution - stars: individual (HD 141569) - stars: kinematics - stars: pre-main sequence Abstract: We present the results of a search for a young stellar moving group associated with the star HD 141569 - a nearby, isolated Herbig AeBe primary member of a 5±3Myr-old triple star system on the outskirts of the Sco-Cen complex. Our spectroscopic survey identified a population of 21 Li-rich, ≳30Myr-old stars within 30° of HD 141569 which possess similar proper motions with the star. The spatial distribution of these Li-rich stars, however, is not suggestive of a moving group associated with the HD 141569 triplet, but rather this sample appears cospatial with Upper Scorpius (US) and Upper Centaurus Lupus (UCL). We apply a modified moving cluster parallax method to compare the kinematics of these youthful stars with those of the US and UCL. Eight new potential members of US and five new potential members of UCL are identified. A substantial moving group with an identifiable nucleus within 15° (∼30pc) of HD 141569 is not found in this sample. Evidently, the HD 141569 system formed ∼5Myr ago in relative isolation, tens of parsecs away from the recent sites of star formation in the Ophiucus-Scorpius-Centaurus region. Description: Forty-nine stars of our input catalog were observed spectroscopically over the course of three observing runs in order to measure spectral types, radial velocities, and LiI and Hα EWs. On 2001 June 18 (UT), the 10 Hipparcos-selected targets and the five FSC targets were observed using the Hamilton Echelle Spectrometer at Lick Observatory. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 122 64 Observing Log table2.dat 96 52 Stellar Parameters table3.dat 107 51 Effective temperatures and lithium equivalent widths
See also: I/259 : The Tycho-2 Catalogue (Hog+ 2000) I/289 : UCAC2 Catalogue (Zacharias+ 2004) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 10 A10 "YYYY/MM/DD" Obs.Date Date of observation 12- 19 A8 --- Tel Telescope 20 A1 --- f_Name [*] HD 141569 added by CDS 21- 43 A23 --- Name Object Name 45- 46 I2 h RAh Hour of Right Ascension (J2000) 48- 49 I2 min RAm Minute of Right Ascension (J2000) 51- 56 F6.3 s RAs Second of Right Ascension (J2000) 58 A1 --- DE- Sign of the Declination (J2000) 59- 60 I2 deg DEd Degree of Declination (J2000) 62- 63 I2 arcmin DEm Arcminute of Declination (J2000) 65- 69 F5.2 arcsec DEs Arcsecond of Declination (J2000) 71- 72 I2 h Obs.h ? UT hour of observation 74- 75 I2 min Obs.m ? UT minute of observation 77- 80 F4.1 s Obs.s ? UT second of observation 82- 85 I4 s Int ? Integration time 87- 89 I3 --- S/N ? Signal-to-noise (1) 91-122 A32 --- Com Comment(s) (2)
Note (1): Approximated using Splot at ∼6500Å and ∼6700Å. Note (2): SB(2) indicates suspected spectroscopic binaries based upon broadened troughs of spectral features.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 2 A2 --- plID Plot identification number 4- 26 A23 --- Name Object Name 28- 33 F6.3 mag Jmag 2MASS J-band magnitude (Cat. II/246) 35- 39 F5.3 mag e_Jmag Uncertainty in Jmag 41- 45 F5.3 mag Hmag 2MASS H-band magnitude (Cat. II/246) 47- 51 F5.3 mag e_Hmag Uncertainty in Hmag 53- 57 F5.3 mag Ksmag 2MASS Ks-band magnitude (Cat. II/246) 59- 63 F5.3 mag e_Ksmag Uncertainty in Kmag 65- 69 F5.1 mas/yr pmRA ? Tycho-2 (Cat. I/259) proper motion in Right Ascension 71- 73 F3.1 mas/yr e_pmRA ? Uncertainty in pmRA 74 A1 --- f_pmRA [*] Indicates pmRA is from UCAC2 (Cat. I/289) 76- 80 F5.1 mas/yr pmDE ? Tycho-2 (Cat. I/259) proper motion in Declination 82- 84 F3.1 mas/yr e_pmDE ? Uncertainty in pmDE 85 A1 --- f_pmDE [*] Indicates pmDE is from UCAC2 (Cat. I/289) 87- 91 F5.2 mas plx ? Hipparcos parallax 93- 96 F4.2 mas e_plx ? Uncertainty in plx
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 2 A2 --- plID Plot identification number 4- 26 A23 --- Name Object Name 28- 30 I3 0.1pm W(Li) ? LiI direct integration equivalent width (1) 32- 34 I3 0.1pm W(Li)g ? LiI Gaussian fit equivalent width (1) 36 A1 --- f_W(Li)g [d] blended line (2) 39- 40 I2 0.1pm Ctmn ? LiI Contamination; see Section 3.2 (1) 42- 45 A4 --- HaFlg Halpha line features (3) 47- 61 A15 --- SpType Spectral Type 63- 66 A4 --- r_SpType Reference for SpType (4) 68- 71 I4 K Teff1 ? Effective temperature from SpType 72 A1 --- --- [-] 73- 76 I4 K Teff1l ? Limit of Teff1 interval 77 A1 --- --- [/] 78- 81 I4 K Teff1a ? Alternative possible effective temperature 83- 87 F5.2 --- Ratio ? The 6200/6210 line ratio (5) 89 A1 --- f_Ratio [n] Flag on Ratio (5) 91- 94 A4 --- SpT2 Spectral Type from line ratio 97 A1 --- l_Teff2 Limit flag on Teff2 98-101 I4 K Teff2 ? Effective temperature for line ratio 103-106 I4 K Teff ? Adopted effective temperature 107 A1 --- f_Teff [*] Teff from H-K color (6)
Note (1): LiI line at λ6707, in units of milli-Angstroms (mÅ=10-13m) Note (2): d = blended line; W(Li)g is the result of fit to LiI in deblending. Note (3): Hα flag as follows: a = Absorption c = core filling observed e* = double peaked emission p = P-Cygni like feature o = emission with overlaid absorption Note (4): Reference for SpType as follows: 1 = typed by A.J. Weinberger using KAST low-resolution spectrograph 2 = Torres et al. (SACY, 2006, Cat. J/A+A/460/695) 3 = Michigan spectral atlas (Houk 1982, Cat. III/51) 4 = Michigan spectral atlas (Houk & Smith-Moore 1988, Cat. III/133) 5 = Michigan spectral atlas (Houk & Swift 1999, Cat. III/214) 6 = HD Catalog spectral type (Cat. III/135) Note (5): the line ratio could not be measured from the spectrum either due to extreme rotational broadening or the lack of presence of either or both lines in question. Note (6): * = Effective temperature determined via interpolation of dereddened H-K color over the color-effective temperature relationship of Kenyon & Hartmann (1995, Cat. J/ApJS/101/117), see Fig. 2.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 03-Jun-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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