play_with_MH.ipynb

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   "source": [
    "# Play with metallicity in the nearby disk\n",
    "## Authors\n",
    "- **David W. Hogg** (NYU) (Flatiron)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
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   "source": [
    "import astropy.io.fits as fits\n",
    "import numpy as np\n",
    "import pylab as plt\n",
    "%matplotlib inline"
   ]
  },
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   "cell_type": "code",
   "execution_count": null,
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   "source": [
    "hdus = fits.open(\"highQ_kinematics.fits\")"
   ]
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   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "data = hdus[1].data"
   ]
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   "execution_count": null,
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   "source": [
    "hdus.close()"
   ]
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   "cell_type": "code",
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   "source": [
    "data.__dict__"
   ]
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   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "MG = data['phot_g_mean_mag'][:] + 5. * np.log10(data['parallax']) - 10.\n",
    "BR = data['phot_bp_mean_mag'][:] - data['phot_rp_mean_mag'][:]"
   ]
  },
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   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Check that the data are okay.\n",
    "plt.figure(figsize=(7, 7))\n",
    "plt.scatter(BR, MG,\n",
    "            c=data['astrophysical_parameters_mh_gspphot'][:],\n",
    "            s=1, alpha=0.5, vmin=-0.5, vmax=0.25)\n",
    "plt.xlim(0.2, 2.5)\n",
    "plt.ylim(8., -3.)\n",
    "plt.xlabel(\"Gaia $B-R$ (mag)\")\n",
    "plt.ylabel(\"Gaia $M_G$ (mag)\")\n",
    "plt.colorbar()\n",
    "plt.savefig(\"cmd.png\")"
   ]
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  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
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