V474 Car: A RARE HALO RS CVn BINARY IN RETROGRADE GALACTIC ORBIT

AbstractA radio survey of red giant SiO sources in the inner Galaxy and bulge is not hindered by extinction. Accurate stellar velocities (<1 km/s) are obtained with minimal observing time (<1 min) per source. Detecting over 20,000 SiO maser sources yields data comparable to optical surveys with the additional strength of a much more thorough coverage of the highly obscured inner Galaxy. Modeling of such a large sample would reveal dynamical structures and minority populations; the velocity structure can be compared to kinematic structures seen in molecular gas, complex orbit structure in the bar, or stellar streams resulting from recently infallen systems. Our Bulge Asymmetries and Dynamic Evolution (BAaDE) survey yields bright SiO masers suitable for follow-up Galactic orbit and parallax determination using VLBI.Here we outline our early VLA observations at 43 GHz in the northern bulge and Galactic plane (0<l°<250), and ALMA observations at 86 GHz in the southern bulge (250<l°<360). We report a preliminary overall 70% detection rate in our color-selected MSX sources.

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A note: Remarks on numerical integration procedures as applied to galactic orbit computations

Celestial Mechanics ◽

10.1007/bf01228029 ◽

1971 ◽

Vol 3 (2) ◽

pp. 145-147 ◽

Cited By ~ 5

Author(s):

K. A. Innanen ◽

F. C. House ◽

C. E. Smith

Keyword(s):

Numerical Integration ◽

Galactic Orbit

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The interaction of the spiral density wave and the Sun's galactic orbit

Astrophysics and Space Science ◽

10.1007/bf00639343 ◽

1978 ◽

Vol 57 (2) ◽

pp. 511-515 ◽

Cited By ~ 31

Author(s):

K. A. Innanen ◽

A. T. Patrick ◽

W. W. Duley

Keyword(s):

Density Wave ◽

Spiral Density Wave ◽

Galactic Orbit

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Annual parallax and galactic orbit of Y Librae (IRAS 15090−0549) Mira variable star—GALORB release

Publications of the Astronomical Society of Japan ◽

10.1093/pasj/psz075 ◽

2019 ◽

Vol 71 (5) ◽

Cited By ~ 1

Author(s):

James O Chibueze ◽

Toshihiro Omodaka ◽

Riku Urago ◽

Takumi Nagayama ◽

Jibrin A Alhassan ◽

...

Keyword(s):

Milky Way ◽

Variable Star ◽

Galactic Center ◽

Galactic Rotation ◽

Potential Contribution ◽

Pulsation Period ◽

Infrared Observations ◽

Trigonometric Parallax ◽

Peculiar Motion ◽

Galactic Orbit

Abstract Using the VLBI Exploration of Radio Astrometry (VERA), we measured the trigonometric parallax of an H2O maser source in a variable star of Mira Cet type, Y Lib, to be 0.855 ± 0.050 mas, corresponding to a distance of 1.17 ± 0.07 kpc. From multi-epoch infrared observations with the Kagoshima University 1 m telescope, we derived the mean J, H, and K′-band magnitudes of Y Lib to be 4.34 ± 0.22 mag, 3.62 ± 0.18 mag, and 3.25 ± 0.16 mag, respectively. The pulsation period of Y Lib was obtained to be 277.2 ± 13.9 d. We derived the effective temperature and radius of Y Lib to be 3100 ± 125 K and $211 \pm 11 \, R_{\odot }$, respectively. The peculiar motion of Y Lib Us (motion towards the Galactic center), Vs (motion in the direction of Galactic rotation), and Ws (motion towards the Galactic North Pole) were obtained to be −16 ± 3 km s−1, 25 ± 2 km s−1, and 13 ± 3 km s−1, respectively. After validation, we used the new release of the GALactic ORbit simulation package to trace the past 1 Gyr orbit of Y Lib in the Milky Way. Fitting the orbit of Y Lib with the MWPotential2014 Galactic Potential model produced high eccentricity in the direction perpendicular to the Galactic center, but decreasing the Miyamoto–Nagai disk potential contribution in the Milky Way model produced a reasonable result of the Y Lib orbit.

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Absolute proper motion and Galactic orbit of M92

Monthly Notices of the Royal Astronomical Society ◽

10.1093/mnras/266.4.925 ◽

1994 ◽

Vol 266 (4) ◽

pp. 925-932 ◽

Cited By ~ 9

Author(s):

R.- D. Scholz ◽

M. Odenkirchen ◽

M. J. Irwin

Keyword(s):

Proper Motion ◽

Galactic Orbit

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Tidal Tails of the Nearest Open Clusters

Proceedings of the International Astronomical Union ◽

10.1017/s1743921308015408 ◽

2007 ◽

Vol 3 (S246) ◽

pp. 107-108

Author(s):

Yaroslav Chumak ◽

Alexey Rastorguev

Keyword(s):

Numerical Simulations ◽

Dynamical Evolution ◽

Open Clusters ◽

Solar Neighborhood ◽

Alpha Persei ◽

Tidal Tails ◽

Galactic Orbit

AbstractWe show that an extended population of stars escaping an evolved cluster and moving along its galactic orbit forms at the final phases of its dynamical evolution. Here we present some results of the numerical simulations for nearest open clusters: Hyades, Pleiades, Praesepe, Alpha Persei, Coma, IC 2391, and IC 2602. We calculated the models of the stellar tails for nearest open clusters and estimated some parameters: sizes, densities, locations relative to the solar neighborhood. Stars of the nearest tails can be observed as moving clusters.

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Classification of K dwarfs according to metal abundance

Symposium - International Astronomical Union ◽

10.1017/s0074180900053481 ◽

1966 ◽

Vol 24 ◽

pp. 231-239

Author(s):

B. E. J. Pagel

Keyword(s):

Kinematic Parameter ◽

Ultraviolet Excess ◽

Galactic Rotation ◽

Type I ◽

Local Standard ◽

Metal Abundance ◽

Halo Population ◽

Galactic Orbit ◽

Local Standard Of Rest

The work of Eggen, Lynden-Bell and Sandage (1) and of Eggen (2) on the correlation between space motion and ultraviolet excess on theUBVsystem among near-by dwarfs has brought out two very interesting effects (among others): first, the usefulness of the eccentricity of a star's galactic orbit as a kinematic parameter; and second, the sharp division into two main stellar populations. We may identify these as a disk population (Baade's Type I) with eccentricitye≤ 0·5 and ultraviolet excess δ (U — B) ≤ 0m15 and a halo population (Baade's Type II) with both parameters usually exceeding these limits; stars of the halo population have velocities symmetrically distributed about the valueV= − 250 km/sec relative to the local standard of rest, corresponding to zero galactic rotation.

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