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Table 7

Variation of the Ca II average absorption depth and average flux around Ca II K and H circumstellar lines.

Periods Average absorption depth Average flux (arb. unit)
CS-line D-family S-family Tip of CS-line Blue wing
K only H only K and H co-added K only H only K only
±5 km s−1 ±5 km s−1 5–25 km s−1 50–100 km s−1 0 ± 2 km s−1 0 ± 2 km s−1 –150 ± 5 km s−1
2003–2004 0.704 ± 0.014 0.61597 ± 0.010 0.276 ± 0.028 0.0495 ± 0.0045 0.01118 ± 0.00063 0.01843 ± 0.00062 0.3881 ± 0.0010
2004–2007 0.753 ± 0.029 0.68788 ± 0.027 0.152 ± 0.024 0.0580 ± 0.0088 0.0105 ± 0.0016 0.0162 ± 0.0024 0.3864 ± 0.0024
2007–2008 0.701 ± 0.013 0.61683 ± 0.013 0.283 ± 0.064 0.134 ± 0.027 0.01146 ± 0.00074 0.01679 ± 0.00080 0.3768 ± 0.0038
2008–2009 0.828 ± 0.020 0.75697 ± 0.026 0.336 ± 0.040 0.061 ± 0.011 0.00437 ± 0.00059 0.00801 ± 0.00091 0.3810 ± 0.0017
2009–2010a 0.72174 0.64518 0.135 0.081 0.0079 0.0204 0.3869
2010–2011 0.610 ± 0.036 0.54054 ± 0.037 0.114 ± 0.022 0.0265 ± 0.0069 0.0124 ± 0.0022 0.0198 ± 0.0029 0.39563 ± 0.00057
2013–2014 0.531 ± 0.012 0.48492 ± 0.012 0.234 ± 0.020 0.104 ± 0.014 0.02185 ± 0.00060 0.02788 ± 0.00065 0.3820 ± 0.0024
2014–2015 0.634 ± 0.016 0.52135 ± 0.015 0.242 ± 0.045 0.0170 ± 0.0041 0.01436 ± 0.00060 0.0233 ± 0.0011 0.3949 ± 0.0014
2015–2016 0.46 ± 0.11 0.34875 ± 0.12 0.099 ± 0.035 0.0294 ± 0.0048 0.0241 ± 0.0060 0.049 ± 0.012 0.3950 ± 0.0021
2016–2017 0.602 ± 0.034 0.4145 ± 0.026 0.200 ± 0.024 0.0450 ± 0.0054 0.0182 ± 0.0012 0.04530 ± 0.00092 0.3858 ± 0.0013

Notes. Average absorption depths are calculated from the normalized spectra, either separating K and H spectra, either co-adding the K and H absorption lines. Average fluxes are calculated from the raw spectra. Their continuum is scaled to an arbitrary level that is common to all spectra. (a) With only one night observed it is not possible to evaluate uncertainties.

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