Kinematics of young stars. II. Galactic spiral structure

Abstract

The young star velocity field is analysed by means of a galactic model which takes into account solar motion, differential galactic rotation and spiral arm kinematics. We use two samples of Hipparcos data, one containing O- and B-type stars and another one composed of Cepheid variable stars. The robustness of our method is tested through careful kinematic simulations. Our results show a galactic rotation curve with a classical value of $A$ Oort constant for the O and B star sample ($A^{\mathrm{OB}}=$ 13.7-13.8 km s${}^{-1}$ kpc ${}^{-1}$) and a higher value for Cepheids ($A^{\mathrm{Cep}}=$ 14.9-16.9 km s${}^{-1}$ kpc ${}^{-1}$, depending on the cosmic distance scale chosen). The second-order term is found to be small, compatible with a zero value. The study of the residuals shows the need for a $K$-term up to a heliocentric distance of 4 kpc, obtaining a value $K=-$(1-3) km s${}^{-1}$ kpc${}^{-1}$. The results obtained for the spiral structure from O and B stars and Cepheids show good agreement. The Sun is located relatively near the minimum of the spiral perturbation potential (${\psi }_{\odot }=$ 284-20$\degr$) and very near the corotation circle. The angular rotation velocity of the spiral pattern was found to be ${\Omega }_{\mathrm{p}}\approx 30$ km s${}^{-1}$ kpc ${}^{-1}$.

18 pages, 6 figures, LaTeX, uses aa.cls. Accepted for publication in A&A

Cited by in corpus (42)

• Gas Dynamics in the Milky Way: Second Pattern Speed and Large-Scale Morphology
• The Spiral Structure of the Milky Way, Cosmic Rays, and Ice Age Epochs on Earth
• On the fine structure of the Cepheid metallicity gradient in the Galactic thin disk
• Gas flow models in the Milky Way embedded bars
• Ice Age Epochs and the Sun's Path Through the Galaxy
• On the kinematic evolution of young local associations and the Sco-Cen complex
• Gas and Stellar Motions and Observational Signatures of Co-Rotating Spiral Arms
• Habitable Zones in the Universe
• Galactic Parameters from Masers with Trigonometric Parallaxes
• Molecular Gas, Kinematics, and OB Star Formation in the Spiral Arms of the Southern Milky Way
• Measuring the local dark matter density with LAMOST DR5 and Gaia DR2
• The Sun was not born in M 67
• Cosmic Ray Acceleration by Spiral Shocks in the Galactic Wind
• Constraining churning and blurring in the Milky Way using large spectroscopic surveys -- an exploratory study
• Gaia DR1 evidence of disrupting Perseus Arm
• A new method for estimating the pattern speed of spiral structure in the Milky Way
• Corotation: its influence on the chemical abundance pattern of the Galaxy
• The spiral structure of the Galaxy revealed by CS sources and evidence for the 4:1 resonance
• Stellar tracers of the Cygnus Arm I. Spectroscopic study of bright photometric candidates
• The OSACA Database and a Kinematic Analysis of Stars in the Solar Neighborhood
• On the possible sources of gravitational wave bursts detectable today
• The corotation gap in the Galactic HI distribution
• Galactic Rotation Parameters from Data on Open Star Clusters
• Probabilities for Solar Siblings
• A novel method to bracket the corotation radius in galaxy disks: vertex deviation maps
• Spiral arm kinematics for Milky Way stellar populations
• Searching for Possible Siblings of the Sun from a Common Cluster based on Stellar Space Velocities
• Galactic Kinematics from OB3 Stars with Distances determined from Interstellar Ca II Lines
• Galactic Rotation Parameters Based on Stars from Activ Star-Forming Regions with Data from the Gaia DR2 Catalogue
• Stellar tracers of the Cygnus Arm. II: A young open cluster in Cam OB3
• Kinematics of OB Stars with Data from the LAMOST and Gaia Catalogues
• High Galactic latitude runaway stars as tracers of the spiral arms
• Investigation of Negative K-Effect Using the Osaca Catalogue
• Kinematics of Tycho-2 Red Giant Clump Stars
• Galaxy Rotation Parameters from OB2 Stars with Proper Motions and Parallaxes from the Gaia EDR3 Catalog
• New Expansion Rate Estimate of the Scorpius-Centaurus Association Based on T Tauri Stars from the Gaia DR2 Catalog
• A and F stars as probes of outer Galactic disc kinematics
• Determination of the Spiral Pattern Speed in the Galaxy from Three Samples of Stars
• Kinematics of T Tauri Stars Close to the Sun from the Gaia DR2 Catalogue
• Estimation of Galactic Spiral Density Wave Parameters Based on the Velocities of OB2 stars from the Gaia EDR3 Catalogue
• Stellar Motion around Spiral Arms: Gaia Mock Data
• The Spiral Pattern Speed in the Milky Way Galaxy