Access to Astronomical Catalogues

← Click to display the menu
J/ApJ/658/480    Pre-main-sequence stars in Lupus association   (Makarov+, 2007)

The Lupus association of pre-main-sequence stars: clues to star formation scattered in space and time. Makarov V.V. <Astrophys. J., 658, 480-486 (2007)> =2007ApJ...658..480M
ADC_Keywords: Associations, stellar ; Stars, pre-main sequence ; Proper motions ; Photometry, UBVRI ; Photometry, infrared Keywords: open clusters and associations: individual (Lupus) - stars: distances - stars: formation - stars: kinematics - stars: pre-main sequence Abstract: Kinematical analysis of spectroscopically identified pre-main-sequence stars associated with the Lupus dark cloud reveals a streamlike motion of low internal velocity dispersion (≤1.3km/s). A statistically significant mismatch between the convergent point radial velocity and the spectroscopic radial velocity from the literature indicates a moderate degree of expansion. The rate of expansion is too low to account for the present extent of the association if one assumes that the spatially dispersed population was formed in the dense molecular cores observed today. Therefore, it is unlikely that the outlying weak-lined T Tauri members were born in the same star-forming cores as the more compactly located classical T Tauri stars, despite the kinematic integrity of the association. Distances inferred from the classical moving-cluster method show a large depth of the association (∼80pc) along the line of sight. A color-magnitude diagram of the association in the near-IR colors corrected for the distribution of distances shows a clear gap separating the older (5-27Myr) and the younger (∼1Myr) generations of stars. Half of the identified 1Myr old stars lie in the tight group of mostly classical T Tauri stars associated with the Lupus 3 dark filament. This nest of very young stars appears to be 25pc farther from the Sun than the center of the greater Lupus association. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 121 93 Kinematic T Tauri Members of the Lupus Association
See also: J/A+A/320/185 : UBVRIcJHKL photometry in Lup (Wichmann+ 1997) J/A+A/326/211 : T Tau Stars (Wichmann+, 1997) J/A+AS/123/329 : New weak-line T Tauri stars in Lupus (Krautter+ 1997) J/MNRAS/331/474 : ubvyβ photometry in the Lupus dark cloud (Franco, 2002) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 14 A14 --- Name Star name 15 A1 --- n_Name [y] Very young object (1) 17- 27 F11.7 deg RAdeg Right ascension in decimal degrees (J2000) 29- 39 F11.7 deg DEdeg Declination in decimal degrees (J2000) 41- 45 F5.1 mas/yr pmRA Proper motion along RA, pmRA*cosDE 47- 51 F5.1 mas/yr pmDE Proper motion along DE 53- 55 F3.1 mas/yr e_pmRA rms uncertainty on pmRA 57- 59 F3.1 mas/yr e_pmDE rms uncertainty on pmDE 61- 63 I3 pc Dkin Kinematic distance 65- 68 F4.1 --- Dev Relative angular deviation, Δ/σΔ 70- 73 F4.1 km/s Vtan Transverse tangential velocity component 75- 79 F5.2 mag Vmag ?=- V magnitude 81- 84 F4.2 mag B-V ?=- B-V colour index 86- 90 F5.2 mag U-B ?=- U-B colour index 92- 95 F4.2 mag V-Rc ?=- V-Rc colour index 97-100 F4.2 mag V-Ic ?=- V-Ic colour index 102-107 F6.3 mag Jmag J magnitude 109-114 F6.3 mag Hmag H magnitude 116-121 F6.3 mag Ksmag Ks magnitude
Note (1): 'y' indicate stars whose location on the near-infrared H-R diagram suggests they may be as young as 1Myr
History: * 20-Feb-2009: From electronic version of the journal * 11-Jun-2009: Typos detected in line 35 to 54. Lines corrected by author
(End) Patricia Vannier [CDS] 21-Jan-2009
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

catalogue service

© UDS/CNRS

Contact