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 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:
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FileName Lrecl Records Explanations
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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
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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
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Bytes Format Units Label Explanations
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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)
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Note (1): Approximated using Splot at ∼6500Å and ∼6700Å.
Note (2): SB(2) indicates suspected spectroscopic binaries
based upon broadened troughs of spectral features.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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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 Hα 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)
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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.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 03-Jun-2011