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19 April 2024 |
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Article overview
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Galactic structure studies with BATC star counts | Cuihua Du
; Xu Zhou
; Jun Ma
; Alfred B-C Chen
; Yanbin Yang
; Jiuli Li
; Hong Wu
; Zhaoji Jiang
; Jiansheng Chen
; | Date: |
24 Apr 2003 | Journal: | Astron.Astrophys. 407 (2003) 541-550 | Subject: | astro-ph | Abstract: | We report the first results of star counts carried out with the National Astronomical Observatories (NAOC) 60/90 cm Schmidt Telescope in 15 intermediate-band filters from 3000 to 10000 {AA} in the BATC survey. We analyze a sample of over 1400 main sequence stars ($14le$V$le21$), which lie in the field with central coordinates R.A.=$09^h53^m13^s.30$ and DEC=47$^circ49^{prime}00^{primeprime}.0$ (J2000). The field of view is 0.95 deg$^{2}$, and the spatial scale was $1arcsec.67$. In our model, the distribution of stars perpendicular to the plane of the Galaxy is given by two exponential disks (thin disk plus thick disk) and a de Vaucouleurs halo. Based on star counts, we derive the scale heights of the thin disk to be $320^{+14}_{-15}$ pc and of the thick disk to be $640^{+30}_{-32}$ pc, respectively, with a local density of $7.0pm1%$ of the thin disk. We find that the observed counts support an axial ratio of $c/ale0.6$ for a de Vaucouleurs $r^{1/4}$ law, implying a more flattened halo. We also derive the stellar luminosity function (SLF) for the thin disk, and it partly agrees with the Hipparcos luminosity function. | Source: | arXiv, astro-ph/0304431 | Services: | Forum | Review | PDF | Favorites |
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