Kinematical and Ellipsoidal Properties of the Inner-Halo Hot Subdwarfs Observed in Gaia DR3 and LAMOST DR7
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866913363877953536 |
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| author | Elsanhoury, W. H. |
| author_facet | Elsanhoury, W. H. |
| contents | Here, we report the kinematical parameters of inner-halo hot subdwarfs located within (d lower than or equal 15 kpc) at high Galactic latitudes (b^o greater than or equal 20). The study included three program stars for one of the extreme He-rich groups (eHe-1) with eccentricity (e=0.65) and the z-component of the angular momentum (J_z=4288.66 kpc km s-1), the inner halo program I with 121 points (T_eff greater than or equal 24,000) and their subsections, i.e. inner halo program II (sdB; 79 points) with (40,000 greater than or equal T_eff greater than or equal 24,000) and inner halo program III (sdO; 42 points) with (80,000 greater than or equal T_eff greater than or equal 40,000). First, we calculated the spatial velocities (U_avg, V_avg, W_avg; km s-1) along the Galactic coordinates and subsequently their subsections sdB and sdO. Second, we calculated the vertex longitudes (l_2) and the Solar motion (S_sun=41.24 +/- 6.42 km s-1) as well as their subsections. Finally, based on the kinematic relation of the ratio (s_2/s_1) and our previously computed numerical value of the angular rotation rate (|A-B|=26.07 +/- 5.10; km s-1 kpc-1), we obtained the average Oort's constant. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2405_16416 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Kinematical and Ellipsoidal Properties of the Inner-Halo Hot Subdwarfs Observed in Gaia DR3 and LAMOST DR7 Elsanhoury, W. H. Astrophysics of Galaxies Solar and Stellar Astrophysics Here, we report the kinematical parameters of inner-halo hot subdwarfs located within (d lower than or equal 15 kpc) at high Galactic latitudes (b^o greater than or equal 20). The study included three program stars for one of the extreme He-rich groups (eHe-1) with eccentricity (e=0.65) and the z-component of the angular momentum (J_z=4288.66 kpc km s-1), the inner halo program I with 121 points (T_eff greater than or equal 24,000) and their subsections, i.e. inner halo program II (sdB; 79 points) with (40,000 greater than or equal T_eff greater than or equal 24,000) and inner halo program III (sdO; 42 points) with (80,000 greater than or equal T_eff greater than or equal 40,000). First, we calculated the spatial velocities (U_avg, V_avg, W_avg; km s-1) along the Galactic coordinates and subsequently their subsections sdB and sdO. Second, we calculated the vertex longitudes (l_2) and the Solar motion (S_sun=41.24 +/- 6.42 km s-1) as well as their subsections. Finally, based on the kinematic relation of the ratio (s_2/s_1) and our previously computed numerical value of the angular rotation rate (|A-B|=26.07 +/- 5.10; km s-1 kpc-1), we obtained the average Oort's constant. |
| title | Kinematical and Ellipsoidal Properties of the Inner-Halo Hot Subdwarfs Observed in Gaia DR3 and LAMOST DR7 |
| topic | Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2405.16416 |