4 Elements present

We identified the following elements through their emission lines, except if otherwise stated.

• Hydrogen. H$\delta$ is too near to the plate border to be useful. H$\gamma$ is preceded by an emission peak on the violet side, distant 600 km$\,$s^-1. The line has W=26 Å$\,$ and a width at the continuum basis of about 700 km$\,$s^-1. H$\beta$ has a width of 2000 km$\,$s^-1 and W=104 Å. H$\alpha$ has W=1637 Å$\,$ and a width of about 11700 km$\,$s^-1. The Balmer decrement is thus very large.

      The Paschen series is visible at least up to n=31; on the spectrogram of 1993 also n=33 is visible, although not n=32.

• Helium. Members of the ¹S,³S,¹D,³D,¹P⁰ series are present in the spectrum, but the lines are neither very intense, nor have the series more than the first two or three terms visible.

      The line $\lambda$6310 could be attributed to He II, but other lines are missing, so that the identification cannot be regarded as trustworthy.

• Carbon is present under the neutral form, with lines from M.6 and 13 and the ionized form with lines from M.2 and 6.
• Nitrogen. Numerous lines of neutral nitrogen are present from M.1, 2, 8, 21 and 29, as well as lines from once ionized nitrogen from M.5, 20 and 53. Is also present M.1 from [N II].
• Oxygen is present in three ionization stages. Neutral oxygen is represented by lines from M.1, 4, 9, 10, 19, 21, 22, 34 and 102; [O I] with lines from M.1. Ionized oxygen is present with lines from M.19, 24, 35, 42, 48 and 58. [O III] is represented by lines from M.1 and 2.
• Sodium is represented by the two lines from M.1 in absorption.
• Magnesium is present in its single ionized form, with lines from M.4, 9, 16, 18 and 27.
• Aluminium is represented by lines from M.66, 110 and 116 of singly ionized aluminium.
• Silicon. Whereas neutral Si is represented by lines from M.54, singly ionized silicium is represented by lines from M.4 and 8.
• Sulphur. Neutral sulphur is present with lines from M.6 and 21, whereas [S I] is present with lines from M.2. Singly ionized sulphur is represented by lines from M.26, 31, 37, 61 and 62 and [SII] by lines from M.2.
• Calcium is present in neutral form (M.4) and singly ionized form (M.2).
• Titanium is present under the form of Ti II with lines from M.20 and under the form of [Ti II] with lines from M.6, 7, 9, 16, 22, 24, 26, 28 and 39.
• Vanadium is only present under the form of [V II] with lines from M.2, 13, 14 and 20.
• Chromium is present both in the form of Cr II (M.11, 18, 31 and 44) and of [Cr II] (M.1, 11, 19, 20 and 30).
• Iron. Iron lines represent the most frequently found lines- totally or partially they are responsible for 61$\%$ of all emission lines. Ionized iron is represented by lines from M.4, 9, 25, 27, 28, 37, 38, 40, 43, 46, 49, 55, 72, 74, 166 and of the non-numbered multiplets listed by Johansson (1978). Forbidden single ionized iron is represented by lines from M.1, 4, 6, 7, 17, 18, 19, 20, 21, 30, 31, 33, 36, 38, 39, 46 and [Fe III] by M.1, 3 and 8.

Of the heavier elements only [Ni II] is present with lines from M.10 and [Zr II] by lines from M.7, 17, 22 and 25. We regard the presence of [Ni II] as dubious.