INTERNAL AND RELATIVE MOTIONS OF THE TAURUS AND OPHIUCHUS STAR-FORMING REGIONS

We investigate the internal and relative motions of the Taurus and Ophiuchus star-forming regions using a sample of young stars with accurately measured radial velocities and proper motions. We find no evidence for expansion or contraction of the Taurus complex, but a clear indication of global rotation, resulting in velocity gradients of the order of 0.1 km s−1 pc−1 across the region. In the case of Ophichus, more data are needed to reliably establish its internal kinematics. Both Taurus and Ophiuchus, have a bulk motion relative to the LSR (i.e., a non-zero mean peculiar velocity) of the order of 5 km s−1. Interestingly, these velocities are roughly equal in magnitude, but nearly exactly opposite in direction. Moving back in time, we find that Taurus and Ophiuchus must have been very near each other 20–25 Myr ago. This suggests a common origin, possibly related to that of Gouldʼs Belt.

[1]  L. Hartmann,et al.  THE GOULD'S BELT VERY LARGE ARRAY SURVEY. IV. THE TAURUS-AURIGA COMPLEX , 2014, 1412.6445.

[2]  L. Loinard,et al.  KINEMATICS OF THE OUTFLOW FROM THE YOUNG STAR DG TAU B: ROTATION IN THE VICINITIES OF AN OPTICAL JET , 2014, 1411.0173.

[3]  L. Hartmann,et al.  THE GOULD’S BELT VERY LARGE ARRAY SURVEY. II. THE SERPENS REGION , 2013, 1307.5105.

[4]  J. H. J. de Bruijne,et al.  Science performance of Gaia, ESA’s space-astrometry mission , 2012, 1201.3238.

[5]  Q. Konopacky,et al.  A SURPRISING DYNAMICAL MASS FOR V773 Tau B , 2011, 1112.1018.

[6]  L. Loinard,et al.  VLBA DETERMINATION OF THE DISTANCE TO NEARBY STAR-FORMING REGIONS. V. DYNAMICAL MASS, DISTANCE, AND RADIO STRUCTURE OF V773 Tau A , 2011, 1112.0114.

[7]  L. Loinard,et al.  Radio continuum emission from knots in the DG Tauri jet , 2011, 1111.1196.

[8]  D. Nguyen,et al.  CLOSE COMPANIONS TO YOUNG STARS. I. A LARGE SPECTROSCOPIC SURVEY IN CHAMAELEON I AND TAURUS-AURIGA , 2011, 1112.0002.

[9]  J. Jørgensen,et al.  Arcsecond resolution images of the chemical structure of the low-mass protostar IRAS 16293-2422 - An overview of a large molecular line survey from the Submillimeter Array , 2011, 1109.0415.

[10]  G. Schaefer.  Fundamental Properties of Young Binary Stars , 2011, 1108.4051.

[11]  W. Dehnen,et al.  Local kinematics and the local standard of rest , 2009, 0912.3693.

[12]  L. Hartmann,et al.  THE DISK POPULATION OF THE TAURUS STAR-FORMING REGION , 2009, 0911.5457.

[13]  S. Wolf,et al.  THE TAURUS SPITZER SURVEY: NEW CANDIDATE TAURUS MEMBERS SELECTED USING SENSITIVE MID-INFRARED PHOTOMETRY , 2009, 0911.3176.

[14]  E. Jensen,et al.  NO TRANSITION DISK? INFRARED EXCESS, PAH, H2, AND X-RAYS FROM THE WEAK-LINED T TAURI STAR DoAr 21 , 2009, 0907.4980.

[15]  L. Loinard,et al.  VLBA DETERMINATION OF THE DISTANCE TO NEARBY STAR-FORMING REGIONS. III. HP TAU/G2 AND THE THREE-DIMENSIONAL STRUCTURE OF TAURUS , 2009, 0903.5338.

[16]  R. Bachiller,et al.  The extremely collimated bipolar H$_{\sf 2}$O jet from the NGC 1333–IRAS 4B protostar , 2009, 0903.2770.

[17]  L. Loinard,et al.  A Preliminary VLBA Distance to the Core of Ophiuchus, with an Accuracy of 4% , 2008, 0801.2192.

[18]  J. Silk,et al.  On the Magnitude of Dark Energy Voids and Overdensities , 2007, 0709.2227.

[19]  S. Sakai,et al.  Astrometry of H$_2$O Masers in Nearby Star-Forming Regions with VERA I. IRAS 16293$-$2422 in $\rho$ Oph East , 2007 .

[20]  D. Padgett,et al.  The Spitzer c2d Survey of Large, Nearby, Interstellar Clouds. VII. Ophiuchus Observed with MIPS , 2007, 0709.3492.

[21]  Laurent Loinard,et al.  VLBA Determination of the Distance to Nearby Star-forming Regions. II. Hubble 4 and HDE 283572 in Taurus , 2007, 0708.4403.

[22]  L. Loinard,et al.  VLBA Determination of the Distance to Nearby Star-forming Regions. I. The Distance to T Tauri with 0.4% Accuracy , 2007, 0708.2081.

[23]  J. M. Carpenter,et al.  Dynamical Masses for Pre-Main-Sequence Stars: A Preliminary Physical Orbit for V773 Tau A , 2007, 0706.2376.

[24]  Claude BertoutFrancoise Genova.  A kinematic study of the Taurus-Auriga T association , 2006, astro-ph/0610506.

[25]  Boulder,et al.  Highlights from the XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST) , 2006, astro-ph/0609160.

[26]  C. Brogan,et al.  IRAS 16293–2422: Proper Motions, Jet Precession, the Hot Core, and the Unambiguous Detection of Infall , 2005, astro-ph/0506435.

[27]  Jonathan P. Williams,et al.  Submillimeter Array Observations of Disks in the SR 24 Multiple Star System , 2004, astro-ph/0411131.

[28]  L. Hartmann,et al.  Mid-infrared Spectra of Class I Protostars in Taurus , 2004 .

[29]  S. Bontemps,et al.  Multiple protostellar systems: I. A deep near infrared survey of Taurus and Ophiuchus protostellar objects , 2004, astro-ph/0407482.

[30]  N. Grosso,et al.  Erratum: The X-ray emission from Young Stellar Objects in the rho Ophiuchi cloud core as seen by XMM-Newton , 2004, astro-ph/0407241.

[31]  D. Johnstone,et al.  An Extinction Threshold for Protostellar Cores in Ophiuchus , 2004, astro-ph/0406640.

[32]  M. Gagne,et al.  Simultaneous Chandra and Very Large Array Observations of Young Stars and Protostars in ρ Ophiuchus Cloud Core A , 2004, astro-ph/0405467.

[33]  A. Ghez,et al.  No Fossil Disk in the T Tauri Multiple System V773 Tauri , 2003, astro-ph/0303648.

[34]  I. Grenier,et al.  3D dynamical evolution of the interstellar gas in the Gould Belt , 2003, astro-ph/0303516.

[35]  L. Loinard,et al.  Ejection of a Low-Mass Star in a Young Stellar System in Taurus , 2003, astro-ph/0303315.

[36]  L. Loinard,et al.  Very Large Array Observations of Proper Motions in L1551 IRS 5 , 2003 .

[37]  J. Girart,et al.  Very Large Array Observations of Proper Motions in YLW 15 , 2003 .

[38]  T. Greene,et al.  An Infrared Multiplicity Survey of Class I/Flat-Spectrum Systems in the ρ Ophiuchi and Serpens Molecular Clouds , 2002, astro-ph/0209224.

[39]  T. Ray,et al.  HST/STIS Spectroscopy of the Optical Outflow from DG Tau: Indications for Rotation in the Initial Jet Channel , 2002, astro-ph/0206175.

[40]  J. Tauber,et al.  The molecular disk surrounding the protostellar binary L1551 IRS5 , 2002 .

[41]  A. Ghez,et al.  Resolved Near-Infrared Spectroscopy of the Mysterious Pre-Main-Sequence Binary System T Tauri S , 2001, astro-ph/0112103.

[42]  L. Hartmann,et al.  A Large-Scale Objective-Prism and X-Ray Survey in Taurus-Auriga , 1999 .

[43]  D. Latham,et al.  A Search for Substellar Companions around 15 Weak-Lined T Tauri Stars with the Planetary Camera 2 of the Hubble Space Telescope , 2005 .

[44]  J. Binney,et al.  Local stellar kinematics from Hipparcos data , 1997, astro-ph/9710077.

[45]  W. Poppel.  The Gould Belt System and the Local Interstellar Medium , 1997 .

[46]  S. Terebey,et al.  A Monthly Survey of Water Masers Associated with Low-Mass Stars , 1996 .

[47]  A. Welty.  Discovery of a Pre-Main-Sequence Spectrscopic Binary: V773 Tauri , 1995 .

[48]  L. Hartmann,et al.  FIRST RESULTS OF THE CIDA SCHMIDT SURVEY: SELECTED ZONES IN TAURUS-AURIGA , 1993 .

[49]  P. Andre',et al.  Submillimeter Continuum Observations of rho Ophiuchi A: The Candidate Protostar VLA 1623 and Prestellar Clumps , 1993 .

[50]  E. Feigelson,et al.  A Rich Cluster of Radio Stars in the rho Ophiuchi Cloud Cores , 1991 .

[51]  A. Wootten,et al.  Cold DCO(+) cores and protostars in the warm Rho Ophiuchi cloud , 1990 .

[52]  L. Mundy,et al.  IRAS 16293-2422: A Very Young Binary System , 1989 .

[53]  F. Vrba,et al.  X-ray sources in regions of star formation. III - Naked T Tauri stars associated with the Taurus-Auriga complex , 1988 .

[54]  P. Thaddeus,et al.  A CO survey of the dark nebulae in Perseus, Taurus, and Auriga , 1987 .

[55]  F. Adams,et al.  Star Formation in Molecular Clouds: Observation and Theory , 1987 .

[56]  L. Hartmann,et al.  Rotational and radial velocities of T Tauri stars , 1986 .

[57]  E. Feigelson,et al.  An Extremely Variable Radio Star in the Rho Ophiuchi Cloud , 1985 .

[58]  E. Falgarone,et al.  Einstein observations of the Rho Ophiuchi dark cloud : an X-ray christmas tree. , 1983 .

[59]  E. Wright,et al.  A far-infrared map of the Ophiuchus dark cloud region , 1976 .

[60]  S. Strom,et al.  A 2-MICRON Map of the Ophiuchus Dark-Cloud Region , 1973 .