Chemically Dissected Rotation Curves of the Galactic Bulge from Main-sequence Proper Motions
نویسندگان
چکیده
منابع مشابه
WFPC 2 proper motions in two bulge fields : kinematics and stellar population of the Galactic bulge
We report proper motion dispersions for stars in the direction of two fields of the Galactic bulge, using HST/WFPC2 images taken six years apart. Our two fields are Baade’s Window (l, b) = (1.13◦,−3.77◦) and Sgr I (l, b) = (1.25◦,−2.65◦). Our proper motion dispersions are in good agreement with prior groundand space-based proper motion studies in bulge fields, but in contrast to some prior stud...
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We present stellar proper motions in the Galactic bulge from the Sagittarius Window Eclipsing Extrasolar Search (SWEEPS) project using ACS/WFC on HST. Proper motions are extracted for more than 180,000 objects, with >81,000 measured to accuracy better than 0.3 mas yr in both coordinates. We report several results based on these measurements: 1. Kinematic separation of bulge from disk allows a s...
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The stellar velocity field within two kiloparsecs of the solar system is investigated from the Hipparcos proper motions and parallaxes of about 20 000 single stars farther than 100 pc. The motion of the sun relative to the Local Standard of Rest and the relative systematic velocity field due to the galactic rotation are studied simultaneously for several categories of stars ranging from early t...
متن کاملHST / WFPC 2 proper motions in two bulge fields : kinematics and stellar population of the Galactic bulge
We report proper motion dispersions for stars in the direction of two fields of the Galactic bulge, using HST/WFPC2 images taken six years apart. Our two fields are Baade’s Window (l, b) = (1.13◦,−3.77◦) and Sgr I (l, b) = (1.25◦,−2.65◦). Our proper motion dispersions are in good agreement with prior groundand space-based proper motion studies in bulge fields, but in contrast to some prior stud...
متن کاملGalactic Kinematics of Cepheids from Hipparcos Proper Motions
The Hipparcos proper motions of 220 galactic Cepheids, together with relevant groundbased photometry, have been analysed. The effects of galactic rotation are very clearly seen. Mean values of the Oort constants, A = 14.82 ± 0.84 km skpc, and B = −12.37 ± 0.64 km skpc, and of the angular velocity of circular rotation at the Sun, Ωo = 27.19 ± 0.87 km s kpc, are derived. Comparison of the value o...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2018
ISSN: 1538-4357
DOI: 10.3847/1538-4357/aaba7f